TY  - CONF
AU  - Simić, Marko
AU  - Ružić, Jovana
AU  - Božić, Dušan
AU  - Radovanović, Željko
AU  - Stašić, Jelena
PY  - 2024
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/13161
PB  - Belgrade : Vinča Institute of Nuclear Sciences - National Institute of thе Republic of Serbia, University of Belgrade
PB  - Belgrade : Serbian Society for Innovative Materials in Extreme Conditions (SIM-EXTREME)
C3  - IMEC2024 - 2nd International Conference on Innovative Materials in Extreme Conditions : Book of abstracts
T1  - Mechanical alloying as a crucial step in the fabrication process of Cu alloys
SP  - 65
EP  - 65
UR  - https://hdl.handle.net/21.15107/rcub_vinar_13161
ER  - 

@conference{
author = "Simić, Marko and Ružić, Jovana and Božić, Dušan and Radovanović, Željko and Stašić, Jelena",
year = "2024",
publisher = "Belgrade : Vinča Institute of Nuclear Sciences - National Institute of thе Republic of Serbia, University of Belgrade, Belgrade : Serbian Society for Innovative Materials in Extreme Conditions (SIM-EXTREME)",
journal = "IMEC2024 - 2nd International Conference on Innovative Materials in Extreme Conditions : Book of abstracts",
title = "Mechanical alloying as a crucial step in the fabrication process of Cu alloys",
pages = "65-65",
url = "https://hdl.handle.net/21.15107/rcub_vinar_13161"
}

Simić, M., Ružić, J., Božić, D., Radovanović, Ž.,& Stašić, J.. (2024). Mechanical alloying as a crucial step in the fabrication process of Cu alloys. in IMEC2024 - 2nd International Conference on Innovative Materials in Extreme Conditions : Book of abstracts
Belgrade : Vinča Institute of Nuclear Sciences - National Institute of thе Republic of Serbia, University of Belgrade., 65-65.
https://hdl.handle.net/21.15107/rcub_vinar_13161

Simić M, Ružić J, Božić D, Radovanović Ž, Stašić J. Mechanical alloying as a crucial step in the fabrication process of Cu alloys. in IMEC2024 - 2nd International Conference on Innovative Materials in Extreme Conditions : Book of abstracts. 2024;:65-65.
https://hdl.handle.net/21.15107/rcub_vinar_13161 .

Simić, Marko, Ružić, Jovana, Božić, Dušan, Radovanović, Željko, Stašić, Jelena, "Mechanical alloying as a crucial step in the fabrication process of Cu alloys" in IMEC2024 - 2nd International Conference on Innovative Materials in Extreme Conditions : Book of abstracts (2024):65-65,
https://hdl.handle.net/21.15107/rcub_vinar_13161 .

TY  - JOUR
AU  - Trtica, Milan
AU  - Savović, Jelena
AU  - Kuzmanović, M.
AU  - Ranković, D.
AU  - Stašić, Jelena
PY  - 2024
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/12052
AB  - The aspect of the detection of hydrogen isotopes in nuclear materials was analyzed in this review. Particular attention was paid to the spectroscopic methods for the detection of hydrogen isotopes in fusion reactor materials since their presence can induce severe problems in terms of material degradation and shortening of its lifetime. The main focus is on laser-induced breakdown spectroscopy, an optical emission method that is efficient, reliable, and fast. Recent results obtained at the VINCA Institute will also be presented.
T2  - Journal of Applied Spectroscopy
T1  - LIBS Hydrogen Isotopes Detection: Significance in Nuclear/Fusion Technology
VL  - 90
VL  - 90
IS  - 6
SP  - 1318
EP  - 1324
DO  - 10.1007/s10812-024-01669-0
UR  - https://hdl.handle.net/21.15107/rcub_vinar_12052
ER  - 

@article{
author = "Trtica, Milan and Savović, Jelena and Kuzmanović, M. and Ranković, D. and Stašić, Jelena",
year = "2024",
abstract = "The aspect of the detection of hydrogen isotopes in nuclear materials was analyzed in this review. Particular attention was paid to the spectroscopic methods for the detection of hydrogen isotopes in fusion reactor materials since their presence can induce severe problems in terms of material degradation and shortening of its lifetime. The main focus is on laser-induced breakdown spectroscopy, an optical emission method that is efficient, reliable, and fast. Recent results obtained at the VINCA Institute will also be presented.",
journal = "Journal of Applied Spectroscopy",
title = "LIBS Hydrogen Isotopes Detection: Significance in Nuclear/Fusion Technology",
volume = "90, 90",
number = "6",
pages = "1318-1324",
doi = "10.1007/s10812-024-01669-0",
url = "https://hdl.handle.net/21.15107/rcub_vinar_12052"
}

Trtica, M., Savović, J., Kuzmanović, M., Ranković, D.,& Stašić, J.. (2024). LIBS Hydrogen Isotopes Detection: Significance in Nuclear/Fusion Technology. in Journal of Applied Spectroscopy, 90(6), 1318-1324.
https://doi.org/10.1007/s10812-024-01669-0
https://hdl.handle.net/21.15107/rcub_vinar_12052

Trtica M, Savović J, Kuzmanović M, Ranković D, Stašić J. LIBS Hydrogen Isotopes Detection: Significance in Nuclear/Fusion Technology. in Journal of Applied Spectroscopy. 2024;90(6):1318-1324.
doi:10.1007/s10812-024-01669-0
https://hdl.handle.net/21.15107/rcub_vinar_12052 .

Trtica, Milan, Savović, Jelena, Kuzmanović, M., Ranković, D., Stašić, Jelena, "LIBS Hydrogen Isotopes Detection: Significance in Nuclear/Fusion Technology" in Journal of Applied Spectroscopy, 90, no. 6 (2024):1318-1324,
https://doi.org/10.1007/s10812-024-01669-0 .,
https://hdl.handle.net/21.15107/rcub_vinar_12052 .

TY  - JOUR
AU  - Simić, Marko
AU  - Ružić, Jovana
AU  - Božić, Dušan
AU  - Stoimenov, Nikolay
AU  - Gyoshev, Stanislav D.
AU  - Karastoyanov, Dimitar N.
AU  - Stašić, Jelena
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11393
AB  - Copper-zirconium alloys with high conductivity were produced using powder metallurgy. Two-steps manufacturing process, containing mechanical alloying followed by hot pressing, was applied in achieving improved mechanical and physical properties of Cu-Zr alloy. In this paper, the influence of boron on Cu-Zr alloys properties was studied on Cu-1Zr (wt.%) and Cu-1.1Zr-0.3B (wt.%) systems. Scanning electron microscopy, laser nanoparticle sizer, computed tomography and X-ray diffraction were employed for observation of changes in the microstructure during production steps. More specifically – variations in size of the Cu particles, powder mixtures’ structural parameters, and development of CuZr phase in binary alloy, CuZr phase and ZrB2 particles in ternary alloy were observed. It was shown that presence of boron increases dislocation density in ternary alloy over the mechanical alloying time compared to binary alloy. The results presented in this study show higher hardening effect in Cu-Zr-B alloy compared to Cu-Zr alloy, resulting in stable hardness values during thermomechanical treatment. Further, it can be seen that finely dispersed reinforcing ZrB2 particles in copper matrix does not have significant influence on its conductivity. Moreover, both systems Cu-Zr and Cu-Zr-B exhibit better electrical conductivity after thermomechanical treatment as a result of zirconium reduction in solid solution due to its precipitation.
AB  - Високо проводне легуре бакра са додатком цирконијума произведене су
металургијом праха. У постизању побољшаних механичких и физичких својстава CuZr легуре примењен је двостепени процес производње, који садржи механичко легирање
праћено топлим пресовањем. У овом раду проучаван је утицај бора на својства Cu-Zr
легура поређењем система Cu-1Zr (теж.%) и Cu-1.1Zr-0.3В (теж.%). Промене у
микроструктури током производних корака праћене су помоћу метода: скенирајућа
електронска микроскопија, ласерско одређивање величина микро- и наночестица,
компјутерска томографија и рендгенска дифракција. Посебно су посматране
варијације у величини честица бакра, структурних параметара мешавине праха и
развој CuZr фазе у бинарној легури, као и CuZr фазе и ZrВ2 честица у терцијарној
легури. Показало се да присуство бора повећава густину дислокација у терцијарној
легури током механичког легирања у поређењу са бинарном легуром. Резултати
приказани у овој студији показују већи ефекат ојачавања у легури Cu-Zr-B у поређењу
са легуром Cu-Zr, што резултира стабилним вредностима тврдоће током термичке
обраде. Даље, може се видети да фино дисперговане честице ZrB2 у матрици бакра
показују незнатан утицај на њену проводљивост. Такође, оба система Cu-Zr и Cu-Zr-B
показују бољу електричну проводљивост након термичке обраде као резултат
редукције цирконијума у чврстом раствору услед његовог таложења.
T2  - Science of Sintering
T1  - The influence of boron addition on properties of copper-zirconium alloys
VL  - 55
IS  - 2
SP  - 205
EP  - 219
DO  - 10.2298/SOS220421003S
ER  - 

@article{
author = "Simić, Marko and Ružić, Jovana and Božić, Dušan and Stoimenov, Nikolay and Gyoshev, Stanislav D. and Karastoyanov, Dimitar N. and Stašić, Jelena",
year = "2023",
abstract = "Copper-zirconium alloys with high conductivity were produced using powder metallurgy. Two-steps manufacturing process, containing mechanical alloying followed by hot pressing, was applied in achieving improved mechanical and physical properties of Cu-Zr alloy. In this paper, the influence of boron on Cu-Zr alloys properties was studied on Cu-1Zr (wt.%) and Cu-1.1Zr-0.3B (wt.%) systems. Scanning electron microscopy, laser nanoparticle sizer, computed tomography and X-ray diffraction were employed for observation of changes in the microstructure during production steps. More specifically – variations in size of the Cu particles, powder mixtures’ structural parameters, and development of CuZr phase in binary alloy, CuZr phase and ZrB2 particles in ternary alloy were observed. It was shown that presence of boron increases dislocation density in ternary alloy over the mechanical alloying time compared to binary alloy. The results presented in this study show higher hardening effect in Cu-Zr-B alloy compared to Cu-Zr alloy, resulting in stable hardness values during thermomechanical treatment. Further, it can be seen that finely dispersed reinforcing ZrB2 particles in copper matrix does not have significant influence on its conductivity. Moreover, both systems Cu-Zr and Cu-Zr-B exhibit better electrical conductivity after thermomechanical treatment as a result of zirconium reduction in solid solution due to its precipitation., Високо проводне легуре бакра са додатком цирконијума произведене су
металургијом праха. У постизању побољшаних механичких и физичких својстава CuZr легуре примењен је двостепени процес производње, који садржи механичко легирање
праћено топлим пресовањем. У овом раду проучаван је утицај бора на својства Cu-Zr
легура поређењем система Cu-1Zr (теж.%) и Cu-1.1Zr-0.3В (теж.%). Промене у
микроструктури током производних корака праћене су помоћу метода: скенирајућа
електронска микроскопија, ласерско одређивање величина микро- и наночестица,
компјутерска томографија и рендгенска дифракција. Посебно су посматране
варијације у величини честица бакра, структурних параметара мешавине праха и
развој CuZr фазе у бинарној легури, као и CuZr фазе и ZrВ2 честица у терцијарној
легури. Показало се да присуство бора повећава густину дислокација у терцијарној
легури током механичког легирања у поређењу са бинарном легуром. Резултати
приказани у овој студији показују већи ефекат ојачавања у легури Cu-Zr-B у поређењу
са легуром Cu-Zr, што резултира стабилним вредностима тврдоће током термичке
обраде. Даље, може се видети да фино дисперговане честице ZrB2 у матрици бакра
показују незнатан утицај на њену проводљивост. Такође, оба система Cu-Zr и Cu-Zr-B
показују бољу електричну проводљивост након термичке обраде као резултат
редукције цирконијума у чврстом раствору услед његовог таложења.",
journal = "Science of Sintering",
title = "The influence of boron addition on properties of copper-zirconium alloys",
volume = "55",
number = "2",
pages = "205-219",
doi = "10.2298/SOS220421003S"
}

Simić, M., Ružić, J., Božić, D., Stoimenov, N., Gyoshev, S. D., Karastoyanov, D. N.,& Stašić, J.. (2023). The influence of boron addition on properties of copper-zirconium alloys. in Science of Sintering, 55(2), 205-219.
https://doi.org/10.2298/SOS220421003S

Simić M, Ružić J, Božić D, Stoimenov N, Gyoshev SD, Karastoyanov DN, Stašić J. The influence of boron addition on properties of copper-zirconium alloys. in Science of Sintering. 2023;55(2):205-219.
doi:10.2298/SOS220421003S .

Simić, Marko, Ružić, Jovana, Božić, Dušan, Stoimenov, Nikolay, Gyoshev, Stanislav D., Karastoyanov, Dimitar N., Stašić, Jelena, "The influence of boron addition on properties of copper-zirconium alloys" in Science of Sintering, 55, no. 2 (2023):205-219,
https://doi.org/10.2298/SOS220421003S . .

TY  - CONF
AU  - Ružić, Jovana
AU  - Simić, Marko
AU  - Božić, Dušan
AU  - Stoimenov, Nikolay
AU  - Goshev, Stanislav
AU  - Stašić, Jelena
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/12098
AB  - Copper-zirconium alloys with the minor addition of boron were manufactured using powder metallurgy, combining mechanical alloying, hot pressing, and sintering. The influence of boron on the mechanical properties of the Cu-Zr alloys was studied on Cu-1Zr (wt.%) and Cu-1.1Zr-0.3B (wt.%) systems. Scanning electron microscopy (SEM), laser nanoparticle sizer, computed tomography, and X-ray diffraction were employed for the observation of morphological and structural changes in the copper microstructure during manufacturing, as well as the development of CuZr phase and ZrB2 particles. Based on SEM and X-ray diffraction analysis, it can be seen that finely dispersed reinforcing ZrB2 particles in copper matrix occur only after the hot pressing process, and not during mechanical alloying. Mechanical properties of the copper-zirconium alloys were investigated using nanoindentation and microhardness tests. It was shown that the presence of a small boron amount, less than 3 wt.%, increases dislocation density in Cu-Zr-B powder mixture with increasing the duration of mechanical alloying. Moreover, analysis of the obtained results reviled that the addition of boron induces a higher hardening effect in Cu-Zr-B alloy compared to CuZr alloy, which results in more stable hardness values during thermomechanical treatment.
PB  - Belgrade : Association of Metallurgical Engineers of Serbia (AMES)
C3  - MME SEE : 5th Metallurgical & Materials Engineering Congress of South-East Europe, June 7-10, 2023; Trebinje, Bosnia and Herzegovina
T1  - Study of the changes in mechanical properties of the copper-zirconium alloys influenced by minor boron addition
SP  - 30
EP  - 30
UR  - https://hdl.handle.net/21.15107/rcub_vinar_12098
ER  - 

@conference{
author = "Ružić, Jovana and Simić, Marko and Božić, Dušan and Stoimenov, Nikolay and Goshev, Stanislav and Stašić, Jelena",
year = "2023",
abstract = "Copper-zirconium alloys with the minor addition of boron were manufactured using powder metallurgy, combining mechanical alloying, hot pressing, and sintering. The influence of boron on the mechanical properties of the Cu-Zr alloys was studied on Cu-1Zr (wt.%) and Cu-1.1Zr-0.3B (wt.%) systems. Scanning electron microscopy (SEM), laser nanoparticle sizer, computed tomography, and X-ray diffraction were employed for the observation of morphological and structural changes in the copper microstructure during manufacturing, as well as the development of CuZr phase and ZrB2 particles. Based on SEM and X-ray diffraction analysis, it can be seen that finely dispersed reinforcing ZrB2 particles in copper matrix occur only after the hot pressing process, and not during mechanical alloying. Mechanical properties of the copper-zirconium alloys were investigated using nanoindentation and microhardness tests. It was shown that the presence of a small boron amount, less than 3 wt.%, increases dislocation density in Cu-Zr-B powder mixture with increasing the duration of mechanical alloying. Moreover, analysis of the obtained results reviled that the addition of boron induces a higher hardening effect in Cu-Zr-B alloy compared to CuZr alloy, which results in more stable hardness values during thermomechanical treatment.",
publisher = "Belgrade : Association of Metallurgical Engineers of Serbia (AMES)",
journal = "MME SEE : 5th Metallurgical & Materials Engineering Congress of South-East Europe, June 7-10, 2023; Trebinje, Bosnia and Herzegovina",
title = "Study of the changes in mechanical properties of the copper-zirconium alloys influenced by minor boron addition",
pages = "30-30",
url = "https://hdl.handle.net/21.15107/rcub_vinar_12098"
}

Ružić, J., Simić, M., Božić, D., Stoimenov, N., Goshev, S.,& Stašić, J.. (2023). Study of the changes in mechanical properties of the copper-zirconium alloys influenced by minor boron addition. in MME SEE : 5th Metallurgical & Materials Engineering Congress of South-East Europe, June 7-10, 2023; Trebinje, Bosnia and Herzegovina
Belgrade : Association of Metallurgical Engineers of Serbia (AMES)., 30-30.
https://hdl.handle.net/21.15107/rcub_vinar_12098

Ružić J, Simić M, Božić D, Stoimenov N, Goshev S, Stašić J. Study of the changes in mechanical properties of the copper-zirconium alloys influenced by minor boron addition. in MME SEE : 5th Metallurgical & Materials Engineering Congress of South-East Europe, June 7-10, 2023; Trebinje, Bosnia and Herzegovina. 2023;:30-30.
https://hdl.handle.net/21.15107/rcub_vinar_12098 .

Ružić, Jovana, Simić, Marko, Božić, Dušan, Stoimenov, Nikolay, Goshev, Stanislav, Stašić, Jelena, "Study of the changes in mechanical properties of the copper-zirconium alloys influenced by minor boron addition" in MME SEE : 5th Metallurgical & Materials Engineering Congress of South-East Europe, June 7-10, 2023; Trebinje, Bosnia and Herzegovina (2023):30-30,
https://hdl.handle.net/21.15107/rcub_vinar_12098 .

TY  - JOUR
AU  - Simić, Marko
AU  - Ružić, Jovana
AU  - Božić, Dušan
AU  - Stašić, Jelena
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/12331
AB  - Copper matrix composites exhibit excellent mechanical and thermal properties. The composite consists of copper (Cu), zirconium (Zr), and boron (B) and is produced using the powder metallurgy technique. The high-energy ball milling was applied for mechanical alloying of the Cu-Zr-B powder mixture to achieve the desired ratio for obtaining a copper matrix reinforced with ZrB2 ceramic particles. The milling times of 10 and 40 hours for two different ball-to-powder ratios are investigated for a powder mixture with a composition of Cu-2.71Zr-2.27B (wt.%). XRD and SEM analyses were employed to determine structural and morphological changes in the mechanically alloyed powder mixture. Investigation of the morphological parameters shows that with prolonged milling, the shape of mixed particles becomes more uniform, while their structural parameters have been drastically changed. It is determined that during high-energy ball milling of the Cu-2.71Zr-2.27B (wt.%), the size of the copper powder decreases as the mechanical alloying increases for both ball-powder ratios. Dislocation densities reach their maximum value at around 30 hours of mechanical alloying for both ball-powder ratios, with dislocation density being higher for the 1:15 ratio, after which they decrease owing to the recrystallization of the copper matrix. XRD analysis shows no presence of ZrB2 reinforcement particles or oxides during milling.
T2  - Metallurgical and Materials Data
T1  - The Effect of Ball-Powder Ratio on The Mechanical and Structural Properties of CuZrB Composite Materials Fabricated by Powder Metallurgy
VL  - 1
IS  - 1
SP  - 19
EP  - 24
DO  - 10.30544/MMD4
ER  - 

@article{
author = "Simić, Marko and Ružić, Jovana and Božić, Dušan and Stašić, Jelena",
year = "2023",
abstract = "Copper matrix composites exhibit excellent mechanical and thermal properties. The composite consists of copper (Cu), zirconium (Zr), and boron (B) and is produced using the powder metallurgy technique. The high-energy ball milling was applied for mechanical alloying of the Cu-Zr-B powder mixture to achieve the desired ratio for obtaining a copper matrix reinforced with ZrB2 ceramic particles. The milling times of 10 and 40 hours for two different ball-to-powder ratios are investigated for a powder mixture with a composition of Cu-2.71Zr-2.27B (wt.%). XRD and SEM analyses were employed to determine structural and morphological changes in the mechanically alloyed powder mixture. Investigation of the morphological parameters shows that with prolonged milling, the shape of mixed particles becomes more uniform, while their structural parameters have been drastically changed. It is determined that during high-energy ball milling of the Cu-2.71Zr-2.27B (wt.%), the size of the copper powder decreases as the mechanical alloying increases for both ball-powder ratios. Dislocation densities reach their maximum value at around 30 hours of mechanical alloying for both ball-powder ratios, with dislocation density being higher for the 1:15 ratio, after which they decrease owing to the recrystallization of the copper matrix. XRD analysis shows no presence of ZrB2 reinforcement particles or oxides during milling.",
journal = "Metallurgical and Materials Data",
title = "The Effect of Ball-Powder Ratio on The Mechanical and Structural Properties of CuZrB Composite Materials Fabricated by Powder Metallurgy",
volume = "1",
number = "1",
pages = "19-24",
doi = "10.30544/MMD4"
}

Simić, M., Ružić, J., Božić, D.,& Stašić, J.. (2023). The Effect of Ball-Powder Ratio on The Mechanical and Structural Properties of CuZrB Composite Materials Fabricated by Powder Metallurgy. in Metallurgical and Materials Data, 1(1), 19-24.
https://doi.org/10.30544/MMD4

Simić M, Ružić J, Božić D, Stašić J. The Effect of Ball-Powder Ratio on The Mechanical and Structural Properties of CuZrB Composite Materials Fabricated by Powder Metallurgy. in Metallurgical and Materials Data. 2023;1(1):19-24.
doi:10.30544/MMD4 .

Simić, Marko, Ružić, Jovana, Božić, Dušan, Stašić, Jelena, "The Effect of Ball-Powder Ratio on The Mechanical and Structural Properties of CuZrB Composite Materials Fabricated by Powder Metallurgy" in Metallurgical and Materials Data, 1, no. 1 (2023):19-24,
https://doi.org/10.30544/MMD4 . .

TY  - CONF
AU  - Simić, Marko
AU  - Ružić, Jovana
AU  - Nidžović, Emilija
AU  - Stašić, Jelena
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/12361
AB  - In powder form, copper (Cu) is the most used element in alloys and composites thanks to its affordability, availability, and capacity to easily improve its properties by adding just a few other elements [1]. It is then of no surprise that Cu composite materials find their application in various industries such as medical devices, aerospace, defense, automotive parts and electronics [2]. In this instance, a hybrid ternary Cu-2wt%Zr0.6wt%B composite was designed. Mechanical alloying (MA) was used to produce adequate powders for further composite manufacturing. The MA process was conducted in two different devices, Atritor Mill and Turbula Shaker Mixer, to determine the effect that the mixing type has on the final material. The milling parameters were set as (i.) duration for 10 h, 20 h, 30 h, and 40 h, (ii.) ball-to-powder ratio was 10:1, (iii.) inert atmosphere - argon. Electron microscopy and X-ray diffraction were used to investigate the microstructural and morphological properties of the Cu-Zr-B MA powder. Obtained results indicate that MA powders produced in Atritor show lower values of structural parameters (crystallite size, lattice parameter and lattice strain) compared to one in Turbula up to 30 h of milling. It should be noted that values of structural parameters after 40 h of milling in Turbula are lower compared to those in Atritor due to the recrystallization of Cu particles. Based on XRD results, the dislocation densities (ρ) were calculated and exhibited that MA powders milled in Atritor possess lower ρ values compared to MA powders milled in Turbula, except ρ of MA powders after 40 h. Higher values of observed structural parameters of MA powders revealed that during milling in Turbula, powders have been exposed to stronger forces in ball-powder-ball and ballpowder-wall collisions.
PB  - Belgrade : Serbian Chemical Society and Serbian Young Chemists' Club
C3  - 9th Conference of Young Chemists of Serbia : Book of abstracts
T1  - The effect of mechanical alloying parameters on the copper matrix composite materials
SP  - 163
EP  - 163
UR  - https://hdl.handle.net/21.15107/rcub_vinar_12291
ER  - 

@conference{
author = "Simić, Marko and Ružić, Jovana and Nidžović, Emilija and Stašić, Jelena",
year = "2023",
abstract = "In powder form, copper (Cu) is the most used element in alloys and composites thanks to its affordability, availability, and capacity to easily improve its properties by adding just a few other elements [1]. It is then of no surprise that Cu composite materials find their application in various industries such as medical devices, aerospace, defense, automotive parts and electronics [2]. In this instance, a hybrid ternary Cu-2wt%Zr0.6wt%B composite was designed. Mechanical alloying (MA) was used to produce adequate powders for further composite manufacturing. The MA process was conducted in two different devices, Atritor Mill and Turbula Shaker Mixer, to determine the effect that the mixing type has on the final material. The milling parameters were set as (i.) duration for 10 h, 20 h, 30 h, and 40 h, (ii.) ball-to-powder ratio was 10:1, (iii.) inert atmosphere - argon. Electron microscopy and X-ray diffraction were used to investigate the microstructural and morphological properties of the Cu-Zr-B MA powder. Obtained results indicate that MA powders produced in Atritor show lower values of structural parameters (crystallite size, lattice parameter and lattice strain) compared to one in Turbula up to 30 h of milling. It should be noted that values of structural parameters after 40 h of milling in Turbula are lower compared to those in Atritor due to the recrystallization of Cu particles. Based on XRD results, the dislocation densities (ρ) were calculated and exhibited that MA powders milled in Atritor possess lower ρ values compared to MA powders milled in Turbula, except ρ of MA powders after 40 h. Higher values of observed structural parameters of MA powders revealed that during milling in Turbula, powders have been exposed to stronger forces in ball-powder-ball and ballpowder-wall collisions.",
publisher = "Belgrade : Serbian Chemical Society and Serbian Young Chemists' Club",
journal = "9th Conference of Young Chemists of Serbia : Book of abstracts",
title = "The effect of mechanical alloying parameters on the copper matrix composite materials",
pages = "163-163",
url = "https://hdl.handle.net/21.15107/rcub_vinar_12291"
}

Simić, M., Ružić, J., Nidžović, E.,& Stašić, J.. (2023). The effect of mechanical alloying parameters on the copper matrix composite materials. in 9th Conference of Young Chemists of Serbia : Book of abstracts
Belgrade : Serbian Chemical Society and Serbian Young Chemists' Club., 163-163.
https://hdl.handle.net/21.15107/rcub_vinar_12291

Simić M, Ružić J, Nidžović E, Stašić J. The effect of mechanical alloying parameters on the copper matrix composite materials. in 9th Conference of Young Chemists of Serbia : Book of abstracts. 2023;:163-163.
https://hdl.handle.net/21.15107/rcub_vinar_12291 .

Simić, Marko, Ružić, Jovana, Nidžović, Emilija, Stašić, Jelena, "The effect of mechanical alloying parameters on the copper matrix composite materials" in 9th Conference of Young Chemists of Serbia : Book of abstracts (2023):163-163,
https://hdl.handle.net/21.15107/rcub_vinar_12291 .

TY  - CONF
AU  - Stašić, Jelena
AU  - Trtica, Milan
AU  - Kuzmanović, M.
AU  - Savović, Jelena
AU  - Ružić, Jovana
AU  - Simić, M.
AU  - Chen, X.
AU  - Božić, Dušan
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11820
AB  - Austenitic stainless steel 316L finds a number of applications including filtration technology, nuclear industry, biomedicine, etc. Powder metallurgy (PM) allows obtaining the desired structure of the material, from full density to highly porous one, and PM technology most often comprises pressing and sintering steps. Gravity sintering, applied in this work, i.e. liquid phase sintering where the pressing step is excluded, is enabled by adding small amount of boron or its compound [1]. The addition of NiB lowers the sintering temperature by formation of eutectics (liquid phase), and also enhances mechanical properties (tensile strength, hardness) and corrosion resistance of 316L steel [2]. The aim of this work was to examine the surface behavior of PM-obtained 316L-NiB exposed to conditions of high heat fluxes by employing nanosecond laser pulses (TEA CO2 laser emitting at 10.6 μm, fluence ~14 J/cm2, intensity ~40 MW/cm2), which is reported scarcely in literature [3]. Simultaneously with irradiation in vacuum, plasma formed by laser irradiation above the sample surface was analyzed using LIBS (Laser Induced Breakdown Spectroscopy). Namely, small amount of boron (1 wt.% of NiB contains 83 wt.% of Ni and 17 wt.% of B) is not easily detected in gravity sintered sample and one of the techniques of choice could be the LIBS. For comparison purposes, 316L sample wihout NiB was also examined. Laser-irradiated surfaces were analyzed using SEM connected to EDX device. The damage was superficial, with intense melting in the central part of the irradiated spot, Fig. 1(a). LIBS analysis, Fig. 1(b), has shown successful in detecting the presence of boron in the 316L-NiB stainless steel, with low estimated limit of detection of 32 ppm.
PB  - Belgrade : Vinča Institute of Nuclear Sciences
C3  - PHOTONICA2023 : 9th International School and Conference on Photonics : book of abstracts; August 28 - September 1, 2023; Belgrade
T1  - Interaction of ns laser with 316L-NiB stainless steel obtained by powder metallurgy – morphological effects and LIBS analysis
SP  - 124
EP  - 124
UR  - https://hdl.handle.net/21.15107/rcub_vinar_11820
ER  - 

@conference{
author = "Stašić, Jelena and Trtica, Milan and Kuzmanović, M. and Savović, Jelena and Ružić, Jovana and Simić, M. and Chen, X. and Božić, Dušan",
year = "2023",
abstract = "Austenitic stainless steel 316L finds a number of applications including filtration technology, nuclear industry, biomedicine, etc. Powder metallurgy (PM) allows obtaining the desired structure of the material, from full density to highly porous one, and PM technology most often comprises pressing and sintering steps. Gravity sintering, applied in this work, i.e. liquid phase sintering where the pressing step is excluded, is enabled by adding small amount of boron or its compound [1]. The addition of NiB lowers the sintering temperature by formation of eutectics (liquid phase), and also enhances mechanical properties (tensile strength, hardness) and corrosion resistance of 316L steel [2]. The aim of this work was to examine the surface behavior of PM-obtained 316L-NiB exposed to conditions of high heat fluxes by employing nanosecond laser pulses (TEA CO2 laser emitting at 10.6 μm, fluence ~14 J/cm2, intensity ~40 MW/cm2), which is reported scarcely in literature [3]. Simultaneously with irradiation in vacuum, plasma formed by laser irradiation above the sample surface was analyzed using LIBS (Laser Induced Breakdown Spectroscopy). Namely, small amount of boron (1 wt.% of NiB contains 83 wt.% of Ni and 17 wt.% of B) is not easily detected in gravity sintered sample and one of the techniques of choice could be the LIBS. For comparison purposes, 316L sample wihout NiB was also examined. Laser-irradiated surfaces were analyzed using SEM connected to EDX device. The damage was superficial, with intense melting in the central part of the irradiated spot, Fig. 1(a). LIBS analysis, Fig. 1(b), has shown successful in detecting the presence of boron in the 316L-NiB stainless steel, with low estimated limit of detection of 32 ppm.",
publisher = "Belgrade : Vinča Institute of Nuclear Sciences",
journal = "PHOTONICA2023 : 9th International School and Conference on Photonics : book of abstracts; August 28 - September 1, 2023; Belgrade",
title = "Interaction of ns laser with 316L-NiB stainless steel obtained by powder metallurgy – morphological effects and LIBS analysis",
pages = "124-124",
url = "https://hdl.handle.net/21.15107/rcub_vinar_11820"
}

Stašić, J., Trtica, M., Kuzmanović, M., Savović, J., Ružić, J., Simić, M., Chen, X.,& Božić, D.. (2023). Interaction of ns laser with 316L-NiB stainless steel obtained by powder metallurgy – morphological effects and LIBS analysis. in PHOTONICA2023 : 9th International School and Conference on Photonics : book of abstracts; August 28 - September 1, 2023; Belgrade
Belgrade : Vinča Institute of Nuclear Sciences., 124-124.
https://hdl.handle.net/21.15107/rcub_vinar_11820

Stašić J, Trtica M, Kuzmanović M, Savović J, Ružić J, Simić M, Chen X, Božić D. Interaction of ns laser with 316L-NiB stainless steel obtained by powder metallurgy – morphological effects and LIBS analysis. in PHOTONICA2023 : 9th International School and Conference on Photonics : book of abstracts; August 28 - September 1, 2023; Belgrade. 2023;:124-124.
https://hdl.handle.net/21.15107/rcub_vinar_11820 .

Stašić, Jelena, Trtica, Milan, Kuzmanović, M., Savović, Jelena, Ružić, Jovana, Simić, M., Chen, X., Božić, Dušan, "Interaction of ns laser with 316L-NiB stainless steel obtained by powder metallurgy – morphological effects and LIBS analysis" in PHOTONICA2023 : 9th International School and Conference on Photonics : book of abstracts; August 28 - September 1, 2023; Belgrade (2023):124-124,
https://hdl.handle.net/21.15107/rcub_vinar_11820 .

TY  - JOUR
AU  - Trtica, Milan
AU  - Stašić, Jelena
AU  - Chen, Xizhang
AU  - Limpouch, Jiri
AU  - Gavrilov, Petr
AU  - Zekić, Andrijana
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10868
AB  - Behavior of ODS steel under high energy fluxes is important as it is one of the most promising fusion reactor materials. The addition of hafnium provides improved microstructure and therefore better mechanical properties at high temperatures, and the goal here was to investigate the effects induced on Hf-containing ODS steel by the action of high-intensity ∼1015 W/cm2 radiation obtained by ultrashort pulsed laser. Morphological and chemical parametric study of the surface was conducted at different work ambiences. New data were obtained on damage parameters, threshold fluences and chemical changes. Measured damage depths were ∼7.5 μm (air), ∼14 μm (helium), ∼48 μm (vacuum), which is somewhat lower compared to ODS steel without the addition of hafnium.
T2  - Fusion Engineering and Design
T1  - 16Cr3Al-Hf ODS steel: Surface effects of high laser intensity of 1015 W/cm2 in ambiences of air, helium and vacuum
VL  - 191
SP  - 113766
DO  - 10.1016/j.fusengdes.2023.113766
ER  - 

@article{
author = "Trtica, Milan and Stašić, Jelena and Chen, Xizhang and Limpouch, Jiri and Gavrilov, Petr and Zekić, Andrijana",
year = "2023",
abstract = "Behavior of ODS steel under high energy fluxes is important as it is one of the most promising fusion reactor materials. The addition of hafnium provides improved microstructure and therefore better mechanical properties at high temperatures, and the goal here was to investigate the effects induced on Hf-containing ODS steel by the action of high-intensity ∼1015 W/cm2 radiation obtained by ultrashort pulsed laser. Morphological and chemical parametric study of the surface was conducted at different work ambiences. New data were obtained on damage parameters, threshold fluences and chemical changes. Measured damage depths were ∼7.5 μm (air), ∼14 μm (helium), ∼48 μm (vacuum), which is somewhat lower compared to ODS steel without the addition of hafnium.",
journal = "Fusion Engineering and Design",
title = "16Cr3Al-Hf ODS steel: Surface effects of high laser intensity of 1015 W/cm2 in ambiences of air, helium and vacuum",
volume = "191",
pages = "113766",
doi = "10.1016/j.fusengdes.2023.113766"
}

Trtica, M., Stašić, J., Chen, X., Limpouch, J., Gavrilov, P.,& Zekić, A.. (2023). 16Cr3Al-Hf ODS steel: Surface effects of high laser intensity of 1015 W/cm2 in ambiences of air, helium and vacuum. in Fusion Engineering and Design, 191, 113766.
https://doi.org/10.1016/j.fusengdes.2023.113766

Trtica M, Stašić J, Chen X, Limpouch J, Gavrilov P, Zekić A. 16Cr3Al-Hf ODS steel: Surface effects of high laser intensity of 1015 W/cm2 in ambiences of air, helium and vacuum. in Fusion Engineering and Design. 2023;191:113766.
doi:10.1016/j.fusengdes.2023.113766 .

Trtica, Milan, Stašić, Jelena, Chen, Xizhang, Limpouch, Jiri, Gavrilov, Petr, Zekić, Andrijana, "16Cr3Al-Hf ODS steel: Surface effects of high laser intensity of 1015 W/cm2 in ambiences of air, helium and vacuum" in Fusion Engineering and Design, 191 (2023):113766,
https://doi.org/10.1016/j.fusengdes.2023.113766 . .

TY  - JOUR
AU  - Trtica, Milan
AU  - Stašić, Jelena
AU  - Chen, Xizhang
AU  - Limpouch, Jiri
AU  - Zekić, Andrijana
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11725
AB  - Ferritic 16Cr3Al ODS steel, with and without the addition of hafnium, was exposed to high-intensity laser radiation of the order of 1013 W/cm2. Irradiation was conducted in the environments of helium and vacuum and the obtained surface effects were observed in the sense of morphology and chemical changes. This class of steels is being developed primarily for structural applications in nuclear reactors, which is why their behavior under harsh conditions, including high power densities, is of utmost importance. The obtained results show mostly superficial changes even at a high number of pulses, which points toward the successful implementation of these materials in a number of applications involving severe work conditions.
T2  - Journal of Innovative Materials in Extreme Conditions
T1  - Effects of Laser Radiation at 10 13 W/cm2 Intensity on Ferritic ODS Steel With and Without Hf in Helium and Vacuum
VL  - 4
IS  - 1
SP  - 1
EP  - 9
UR  - https://hdl.handle.net/21.15107/rcub_vinar_11725
ER  - 

@article{
author = "Trtica, Milan and Stašić, Jelena and Chen, Xizhang and Limpouch, Jiri and Zekić, Andrijana",
year = "2023",
abstract = "Ferritic 16Cr3Al ODS steel, with and without the addition of hafnium, was exposed to high-intensity laser radiation of the order of 1013 W/cm2. Irradiation was conducted in the environments of helium and vacuum and the obtained surface effects were observed in the sense of morphology and chemical changes. This class of steels is being developed primarily for structural applications in nuclear reactors, which is why their behavior under harsh conditions, including high power densities, is of utmost importance. The obtained results show mostly superficial changes even at a high number of pulses, which points toward the successful implementation of these materials in a number of applications involving severe work conditions.",
journal = "Journal of Innovative Materials in Extreme Conditions",
title = "Effects of Laser Radiation at 10 13 W/cm2 Intensity on Ferritic ODS Steel With and Without Hf in Helium and Vacuum",
volume = "4",
number = "1",
pages = "1-9",
url = "https://hdl.handle.net/21.15107/rcub_vinar_11725"
}

Trtica, M., Stašić, J., Chen, X., Limpouch, J.,& Zekić, A.. (2023). Effects of Laser Radiation at 10 13 W/cm2 Intensity on Ferritic ODS Steel With and Without Hf in Helium and Vacuum. in Journal of Innovative Materials in Extreme Conditions, 4(1), 1-9.
https://hdl.handle.net/21.15107/rcub_vinar_11725

Trtica M, Stašić J, Chen X, Limpouch J, Zekić A. Effects of Laser Radiation at 10 13 W/cm2 Intensity on Ferritic ODS Steel With and Without Hf in Helium and Vacuum. in Journal of Innovative Materials in Extreme Conditions. 2023;4(1):1-9.
https://hdl.handle.net/21.15107/rcub_vinar_11725 .

Trtica, Milan, Stašić, Jelena, Chen, Xizhang, Limpouch, Jiri, Zekić, Andrijana, "Effects of Laser Radiation at 10 13 W/cm2 Intensity on Ferritic ODS Steel With and Without Hf in Helium and Vacuum" in Journal of Innovative Materials in Extreme Conditions, 4, no. 1 (2023):1-9,
https://hdl.handle.net/21.15107/rcub_vinar_11725 .

TY  - CONF
AU  - Trtica, Milan
AU  - Stašić, Jelena
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11821
AB  - Interaction of a pulsed, ns-laser operating at 10.6 μm with a titanium target in hydrogen ambience was studied. In general, interaction in this type of environment is scarcely studied; however it can be of great importance. Titanium and its alloys show excellent physical and chemical properties and for these reasons they are attractive for aero-space and marine engineering, medicine, nuclear problematics, etc. Some phenomena, especially the action of thermal flux on a material, within fission/fusion reactor for example, can be simulated by ns-laser [1,2]. The Ti-surface variations at high TEA CO2 laser energy density/fluence of ~20 J/cm2 and intensity of ~60 MW/cm2 were investigated in this work. Irradiation was carried out at a reduced H2 atmosphere of ~200 mbar [3]. The energy absorbed from the laser beam is partially converted to thermal energy, which generates a series of effects, such as melting, vaporization of the molten material, shock waves, etc. Also, it should be mentioned that irradiation was accompanied by generation of plasma in front of the target. The following titanium target surface changes and phenomena were observed: (i) the damages were only on a superficial level (Fig. 1B) with depth ≤ 2 μm; (ii) appearance of pores on the grain boundaries in the central irradiated zone (Fig. 1A). The cracking effect is visible as well in this zone. In the main, all changes can be attributed to the extra-fast heating and cooling process; (iii) in the peripheral zones similar features were registered, while the transition between irradiated and non-irradiated region is sharp. It can be concluded from this study that the reported laser fluence and intensity, in hydrogen ambience, effectively modified the titanium target. The created surface structures generally could be acceptable in cases where high roughness is required, while for some applications in nuclear technologies additional studies should be done (in this context, the presence of H2 in fusion reactor materials is not desirable [3]).
PB  - Belgrade : Vinča Institute of Nuclear Sciences
C3  - PHOTONICA2023 : 9th International School and Conference on Photonics : book of abstracts; August 28 - September 1, 2023; Belgrade
T1  - ns-Laser – titanium interaction: hydrogen ambience
SP  - 125
EP  - 125
UR  - https://hdl.handle.net/21.15107/rcub_vinar_11821
ER  - 

@conference{
author = "Trtica, Milan and Stašić, Jelena",
year = "2023",
abstract = "Interaction of a pulsed, ns-laser operating at 10.6 μm with a titanium target in hydrogen ambience was studied. In general, interaction in this type of environment is scarcely studied; however it can be of great importance. Titanium and its alloys show excellent physical and chemical properties and for these reasons they are attractive for aero-space and marine engineering, medicine, nuclear problematics, etc. Some phenomena, especially the action of thermal flux on a material, within fission/fusion reactor for example, can be simulated by ns-laser [1,2]. The Ti-surface variations at high TEA CO2 laser energy density/fluence of ~20 J/cm2 and intensity of ~60 MW/cm2 were investigated in this work. Irradiation was carried out at a reduced H2 atmosphere of ~200 mbar [3]. The energy absorbed from the laser beam is partially converted to thermal energy, which generates a series of effects, such as melting, vaporization of the molten material, shock waves, etc. Also, it should be mentioned that irradiation was accompanied by generation of plasma in front of the target. The following titanium target surface changes and phenomena were observed: (i) the damages were only on a superficial level (Fig. 1B) with depth ≤ 2 μm; (ii) appearance of pores on the grain boundaries in the central irradiated zone (Fig. 1A). The cracking effect is visible as well in this zone. In the main, all changes can be attributed to the extra-fast heating and cooling process; (iii) in the peripheral zones similar features were registered, while the transition between irradiated and non-irradiated region is sharp. It can be concluded from this study that the reported laser fluence and intensity, in hydrogen ambience, effectively modified the titanium target. The created surface structures generally could be acceptable in cases where high roughness is required, while for some applications in nuclear technologies additional studies should be done (in this context, the presence of H2 in fusion reactor materials is not desirable [3]).",
publisher = "Belgrade : Vinča Institute of Nuclear Sciences",
journal = "PHOTONICA2023 : 9th International School and Conference on Photonics : book of abstracts; August 28 - September 1, 2023; Belgrade",
title = "ns-Laser – titanium interaction: hydrogen ambience",
pages = "125-125",
url = "https://hdl.handle.net/21.15107/rcub_vinar_11821"
}

Trtica, M.,& Stašić, J.. (2023). ns-Laser – titanium interaction: hydrogen ambience. in PHOTONICA2023 : 9th International School and Conference on Photonics : book of abstracts; August 28 - September 1, 2023; Belgrade
Belgrade : Vinča Institute of Nuclear Sciences., 125-125.
https://hdl.handle.net/21.15107/rcub_vinar_11821

Trtica M, Stašić J. ns-Laser – titanium interaction: hydrogen ambience. in PHOTONICA2023 : 9th International School and Conference on Photonics : book of abstracts; August 28 - September 1, 2023; Belgrade. 2023;:125-125.
https://hdl.handle.net/21.15107/rcub_vinar_11821 .

Trtica, Milan, Stašić, Jelena, "ns-Laser – titanium interaction: hydrogen ambience" in PHOTONICA2023 : 9th International School and Conference on Photonics : book of abstracts; August 28 - September 1, 2023; Belgrade (2023):125-125,
https://hdl.handle.net/21.15107/rcub_vinar_11821 .

TY  - CONF
AU  - Simić, Marko
AU  - Ružić, Jovana
AU  - Luković, Jelena
AU  - Božić, Dušan
AU  - Alil, Ana
AU  - Volkov Husović, Tatjana
AU  - Stašić, Jelena
PY  - 2022
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/12093
AB  - Ternary Cu-2.71Zr-2.27B (wt.%) alloys were fabricated using powder metallurgy, i.e., mechanical alloying followed by cold pressing and sintering. Influence of the mechanical alloying parameters on microstructural and morphological changes of Cu-Zr-B powder mixture was investigated using scanning electron microscopy and X-ray diffraction. Stereological analysis was employed to determine changes in size and shape of copper particles during 40 hours of mechanical alloying. It was shown that with an increase in mechanical alloying time, the size of copper powder decreases. Williamson-Hall analysis was used to calculate crystallite sizes (D, nm), lattice parameter (nm), lattice strain (ε, %), and dislocation density (ρ, m-2). It was shown that with increasing mechanical allo ying time, lattice parameter as well as lattice strain both increases. Particles undergo high forces through ball-particle-ball and wall-particle-ball collisions during mechanical alloying. These collisions induce accumulation of dislocations in copper matrix and a decreasing in its crystallite size due to dominant plastic deformation mechanisms. Dislocation densities reach its maximum value at around 30 hours of mechanical alloying, after which they decrease owing to the recrystallization of copper matrix.
PB  - Beograd : Institut za istraživanja i projektovanja u privredi
C3  - YOURS 2022 : YOUng researcheRS conference 2022 : Book of abstracts
T1  - X-Ray analysis by Williamson-Hall and stereological analysis of mechanically alloyed Cu-Zr-B alloys
SP  - 13
EP  - 13
UR  - https://hdl.handle.net/21.15107/rcub_vinar_12093
ER  - 

@conference{
author = "Simić, Marko and Ružić, Jovana and Luković, Jelena and Božić, Dušan and Alil, Ana and Volkov Husović, Tatjana and Stašić, Jelena",
year = "2022",
abstract = "Ternary Cu-2.71Zr-2.27B (wt.%) alloys were fabricated using powder metallurgy, i.e., mechanical alloying followed by cold pressing and sintering. Influence of the mechanical alloying parameters on microstructural and morphological changes of Cu-Zr-B powder mixture was investigated using scanning electron microscopy and X-ray diffraction. Stereological analysis was employed to determine changes in size and shape of copper particles during 40 hours of mechanical alloying. It was shown that with an increase in mechanical alloying time, the size of copper powder decreases. Williamson-Hall analysis was used to calculate crystallite sizes (D, nm), lattice parameter (nm), lattice strain (ε, %), and dislocation density (ρ, m-2). It was shown that with increasing mechanical allo ying time, lattice parameter as well as lattice strain both increases. Particles undergo high forces through ball-particle-ball and wall-particle-ball collisions during mechanical alloying. These collisions induce accumulation of dislocations in copper matrix and a decreasing in its crystallite size due to dominant plastic deformation mechanisms. Dislocation densities reach its maximum value at around 30 hours of mechanical alloying, after which they decrease owing to the recrystallization of copper matrix.",
publisher = "Beograd : Institut za istraživanja i projektovanja u privredi",
journal = "YOURS 2022 : YOUng researcheRS conference 2022 : Book of abstracts",
title = "X-Ray analysis by Williamson-Hall and stereological analysis of mechanically alloyed Cu-Zr-B alloys",
pages = "13-13",
url = "https://hdl.handle.net/21.15107/rcub_vinar_12093"
}

Simić, M., Ružić, J., Luković, J., Božić, D., Alil, A., Volkov Husović, T.,& Stašić, J.. (2022). X-Ray analysis by Williamson-Hall and stereological analysis of mechanically alloyed Cu-Zr-B alloys. in YOURS 2022 : YOUng researcheRS conference 2022 : Book of abstracts
Beograd : Institut za istraživanja i projektovanja u privredi., 13-13.
https://hdl.handle.net/21.15107/rcub_vinar_12093

Simić M, Ružić J, Luković J, Božić D, Alil A, Volkov Husović T, Stašić J. X-Ray analysis by Williamson-Hall and stereological analysis of mechanically alloyed Cu-Zr-B alloys. in YOURS 2022 : YOUng researcheRS conference 2022 : Book of abstracts. 2022;:13-13.
https://hdl.handle.net/21.15107/rcub_vinar_12093 .

Simić, Marko, Ružić, Jovana, Luković, Jelena, Božić, Dušan, Alil, Ana, Volkov Husović, Tatjana, Stašić, Jelena, "X-Ray analysis by Williamson-Hall and stereological analysis of mechanically alloyed Cu-Zr-B alloys" in YOURS 2022 : YOUng researcheRS conference 2022 : Book of abstracts (2022):13-13,
https://hdl.handle.net/21.15107/rcub_vinar_12093 .

TY  - JOUR
AU  - Zhao, Senlin
AU  - Xin, Dongqun
AU  - Chen, Xizhang
AU  - Stašić, Jelena
AU  - Trtica, Milan
AU  - Siddiquee, Arshad Noor
AU  - Mohan, Sanjay
PY  - 2022
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10292
AB  - AlCoxCrFeNi (x = 2.2, 2.8) high entropy alloys (HEAs) were successfully prepared by multi-layer and multi-channel laser melting deposition (LMD). The tensile properties of the LMD-fabricated AlCoxCrFeNi HEAs were investigated. The phase evolution of these alloys was examined by X-ray diffraction and compared with existing models. The microstructure of the alloys was characterized using scanning electron microscopy and electron backscatter diffraction. It is found that Co element can promote the phase transformation from BCC phase to FCC phase in the as-deposited AlCoxCrFeNi HEAs, and the volume fraction of FCC phase increases from 51.4% to 74.6% as the Co content increases from 36.2 at% to 40.8 at%. With the increase of Co content, the grain size of BCC phase in the alloys decreases and a larger amount of fine needle-like BCC phase appears in the FCC matrix. Tensile testing shows that higher Co content in the deposited AlCoxCrFeNi alloy can enhance its plasticity without significantly compromising its ultimate strength. As the Co content increases, the fracture strain increases from 5.9% to 15.4%, while the yield strength reduces from 450 MPa to 360 MPa and the ultimate tensile strength increases from 734 MPa to 739 MPa. The variations in tensile properties of the AlCoxCrFeNi alloy result from phase structure changes and microstructure evolution. Through this research, it is demonstrated that enhancement of the tensile properties of the LMD-fabricated AlCoCrFeNi HEAs can be realized by increasing the content of Co element.
T2  - Journal of Alloys and Compounds
T1  - Microstructure and enhanced tensile properties of AlCoxCrFeNi high entropy alloys with high Co content fabricated by laser melting deposition
VL  - 917
SP  - 165403
DO  - 10.1016/j.jallcom.2022.165403
ER  - 

@article{
author = "Zhao, Senlin and Xin, Dongqun and Chen, Xizhang and Stašić, Jelena and Trtica, Milan and Siddiquee, Arshad Noor and Mohan, Sanjay",
year = "2022",
abstract = "AlCoxCrFeNi (x = 2.2, 2.8) high entropy alloys (HEAs) were successfully prepared by multi-layer and multi-channel laser melting deposition (LMD). The tensile properties of the LMD-fabricated AlCoxCrFeNi HEAs were investigated. The phase evolution of these alloys was examined by X-ray diffraction and compared with existing models. The microstructure of the alloys was characterized using scanning electron microscopy and electron backscatter diffraction. It is found that Co element can promote the phase transformation from BCC phase to FCC phase in the as-deposited AlCoxCrFeNi HEAs, and the volume fraction of FCC phase increases from 51.4% to 74.6% as the Co content increases from 36.2 at% to 40.8 at%. With the increase of Co content, the grain size of BCC phase in the alloys decreases and a larger amount of fine needle-like BCC phase appears in the FCC matrix. Tensile testing shows that higher Co content in the deposited AlCoxCrFeNi alloy can enhance its plasticity without significantly compromising its ultimate strength. As the Co content increases, the fracture strain increases from 5.9% to 15.4%, while the yield strength reduces from 450 MPa to 360 MPa and the ultimate tensile strength increases from 734 MPa to 739 MPa. The variations in tensile properties of the AlCoxCrFeNi alloy result from phase structure changes and microstructure evolution. Through this research, it is demonstrated that enhancement of the tensile properties of the LMD-fabricated AlCoCrFeNi HEAs can be realized by increasing the content of Co element.",
journal = "Journal of Alloys and Compounds",
title = "Microstructure and enhanced tensile properties of AlCoxCrFeNi high entropy alloys with high Co content fabricated by laser melting deposition",
volume = "917",
pages = "165403",
doi = "10.1016/j.jallcom.2022.165403"
}

Zhao, S., Xin, D., Chen, X., Stašić, J., Trtica, M., Siddiquee, A. N.,& Mohan, S.. (2022). Microstructure and enhanced tensile properties of AlCoxCrFeNi high entropy alloys with high Co content fabricated by laser melting deposition. in Journal of Alloys and Compounds, 917, 165403.
https://doi.org/10.1016/j.jallcom.2022.165403

Zhao S, Xin D, Chen X, Stašić J, Trtica M, Siddiquee AN, Mohan S. Microstructure and enhanced tensile properties of AlCoxCrFeNi high entropy alloys with high Co content fabricated by laser melting deposition. in Journal of Alloys and Compounds. 2022;917:165403.
doi:10.1016/j.jallcom.2022.165403 .

Zhao, Senlin, Xin, Dongqun, Chen, Xizhang, Stašić, Jelena, Trtica, Milan, Siddiquee, Arshad Noor, Mohan, Sanjay, "Microstructure and enhanced tensile properties of AlCoxCrFeNi high entropy alloys with high Co content fabricated by laser melting deposition" in Journal of Alloys and Compounds, 917 (2022):165403,
https://doi.org/10.1016/j.jallcom.2022.165403 . .

TY  - JOUR
AU  - Zhou, Chao
AU  - Zhang, Youzhi
AU  - Stašić, Jelena
AU  - Liang, Yu
AU  - Chen, Xizhang
AU  - Trtica, Milan
PY  - 2022
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10541
AB  - High-entropy alloys (HEAs) have received much attention since presented in 2004. Machine learning (ML) can accelerate the research of new HEAs. At present, among the ML research methods used to predict the properties of HEAs, alloys are manufactured mainly by the melt-casting method. The existing ML methods do not use the process parameters of the manufacturing process as input features. Unlike the melt-casting method, additive manufacturing (AM) has promising applications with its ability to prototype and manufacture complex-shaped parts rapidly. The AM process parameters can significantly affect the performance of HEAs. The process parameters are a critical factor that must be considered for ML. Therefore, an ML method dependent on AM process parameters is proposed to predict the hardness of HEAs. The prediction results of six commonly used ML models are compared. The dependence of ML on process parameters is investigated. Four new HEAs are manufactured based on AM to verify the reliability of ML prediction results. The experimental results show that adding process parameters to ML improves the prediction accuracy by 4%. The prediction accuracy of ML reaches 89%, and the average prediction error for new HEAs is 3.83%.
T2  - Advanced Engineering Materials
T1  - Hardness Predicting of Additively Manufactured High-Entropy Alloys Based on Fabrication Parameter-Dependent Machine Learning
SP  - 2201369
DO  - 10.1002/adem.202201369
ER  - 

@article{
author = "Zhou, Chao and Zhang, Youzhi and Stašić, Jelena and Liang, Yu and Chen, Xizhang and Trtica, Milan",
year = "2022",
abstract = "High-entropy alloys (HEAs) have received much attention since presented in 2004. Machine learning (ML) can accelerate the research of new HEAs. At present, among the ML research methods used to predict the properties of HEAs, alloys are manufactured mainly by the melt-casting method. The existing ML methods do not use the process parameters of the manufacturing process as input features. Unlike the melt-casting method, additive manufacturing (AM) has promising applications with its ability to prototype and manufacture complex-shaped parts rapidly. The AM process parameters can significantly affect the performance of HEAs. The process parameters are a critical factor that must be considered for ML. Therefore, an ML method dependent on AM process parameters is proposed to predict the hardness of HEAs. The prediction results of six commonly used ML models are compared. The dependence of ML on process parameters is investigated. Four new HEAs are manufactured based on AM to verify the reliability of ML prediction results. The experimental results show that adding process parameters to ML improves the prediction accuracy by 4%. The prediction accuracy of ML reaches 89%, and the average prediction error for new HEAs is 3.83%.",
journal = "Advanced Engineering Materials",
title = "Hardness Predicting of Additively Manufactured High-Entropy Alloys Based on Fabrication Parameter-Dependent Machine Learning",
pages = "2201369",
doi = "10.1002/adem.202201369"
}

Zhou, C., Zhang, Y., Stašić, J., Liang, Y., Chen, X.,& Trtica, M.. (2022). Hardness Predicting of Additively Manufactured High-Entropy Alloys Based on Fabrication Parameter-Dependent Machine Learning. in Advanced Engineering Materials, 2201369.
https://doi.org/10.1002/adem.202201369

Zhou C, Zhang Y, Stašić J, Liang Y, Chen X, Trtica M. Hardness Predicting of Additively Manufactured High-Entropy Alloys Based on Fabrication Parameter-Dependent Machine Learning. in Advanced Engineering Materials. 2022;:2201369.
doi:10.1002/adem.202201369 .

Zhou, Chao, Zhang, Youzhi, Stašić, Jelena, Liang, Yu, Chen, Xizhang, Trtica, Milan, "Hardness Predicting of Additively Manufactured High-Entropy Alloys Based on Fabrication Parameter-Dependent Machine Learning" in Advanced Engineering Materials (2022):2201369,
https://doi.org/10.1002/adem.202201369 . .

TY  - CONF
AU  - Ciganović, Jovan
AU  - Momčilović, Miloš
AU  - Živković, Sanja
AU  - Stašić, Jelena
AU  - Trtica, Milan
PY  - 2022
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/12094
AB  - The interaction of lasers with metals has been studied for decades, and has been especially intensified lately, due to the development of new, efficient pulsed lasers. Titanium has a number of excellent properties, making it applicable in various modern technologies. Treatment and processing of titanium is possible with various techniques, and the application of lasers gives a special quality, such as high precision machining or obtaining specific structures on the surface which cannot be generated by other methods. During our research, surface processing of titanium was conducted by various pulsed lasers: nanosecond CO2 laser, picosecond Nd:YAG laser and femtosecond Ti: sapphire laser. In order to find the optimal conditions for surface modification of titanium, the influence of different laser parameters (wavelength, pulse duration, pulse energy, etc.), as well as the influence of the ambient, was examined. The titanium samples were irradiated in different environments, ie. in air, oxygen, nitrogen, carbon dioxide, helium and in vacuum, which affected the chemical composition and morphology of the target surface.
C3  - SPIG 2022 : 31st Summer School and International Symposium on the Physics of Ionized Gases : Contributed papers and abstracts
T1  - Action of pulsed lasers on titanium target: surface effects
VL  - 102
SP  - 77
EP  - 77
UR  - https://hdl.handle.net/21.15107/rcub_vinar_12094
ER  - 

@conference{
author = "Ciganović, Jovan and Momčilović, Miloš and Živković, Sanja and Stašić, Jelena and Trtica, Milan",
year = "2022",
abstract = "The interaction of lasers with metals has been studied for decades, and has been especially intensified lately, due to the development of new, efficient pulsed lasers. Titanium has a number of excellent properties, making it applicable in various modern technologies. Treatment and processing of titanium is possible with various techniques, and the application of lasers gives a special quality, such as high precision machining or obtaining specific structures on the surface which cannot be generated by other methods. During our research, surface processing of titanium was conducted by various pulsed lasers: nanosecond CO2 laser, picosecond Nd:YAG laser and femtosecond Ti: sapphire laser. In order to find the optimal conditions for surface modification of titanium, the influence of different laser parameters (wavelength, pulse duration, pulse energy, etc.), as well as the influence of the ambient, was examined. The titanium samples were irradiated in different environments, ie. in air, oxygen, nitrogen, carbon dioxide, helium and in vacuum, which affected the chemical composition and morphology of the target surface.",
journal = "SPIG 2022 : 31st Summer School and International Symposium on the Physics of Ionized Gases : Contributed papers and abstracts",
title = "Action of pulsed lasers on titanium target: surface effects",
volume = "102",
pages = "77-77",
url = "https://hdl.handle.net/21.15107/rcub_vinar_12094"
}

Ciganović, J., Momčilović, M., Živković, S., Stašić, J.,& Trtica, M.. (2022). Action of pulsed lasers on titanium target: surface effects. in SPIG 2022 : 31st Summer School and International Symposium on the Physics of Ionized Gases : Contributed papers and abstracts, 102, 77-77.
https://hdl.handle.net/21.15107/rcub_vinar_12094

Ciganović J, Momčilović M, Živković S, Stašić J, Trtica M. Action of pulsed lasers on titanium target: surface effects. in SPIG 2022 : 31st Summer School and International Symposium on the Physics of Ionized Gases : Contributed papers and abstracts. 2022;102:77-77.
https://hdl.handle.net/21.15107/rcub_vinar_12094 .

Ciganović, Jovan, Momčilović, Miloš, Živković, Sanja, Stašić, Jelena, Trtica, Milan, "Action of pulsed lasers on titanium target: surface effects" in SPIG 2022 : 31st Summer School and International Symposium on the Physics of Ionized Gases : Contributed papers and abstracts, 102 (2022):77-77,
https://hdl.handle.net/21.15107/rcub_vinar_12094 .

TY  - CONF
AU  - Popović, D. M.
AU  - Kushima, A.
AU  - Zekić, A. A.
AU  - Kasalica, B.
AU  - Stašić, Jelena
AU  - Ciganović, Jovan
AU  - Bogdanović, M.
AU  - Trtica, Milan
PY  - 2022
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/12095
AB  - Silicon-based nanoparticles (SiNPs) attract authors’ attention due its application prospects in a mutual field, from energy storage to bio-imaging. One of the most prominent methods for synthesis of SiNPs is pulsed laser ablation in liquid media (LAL), because it is simple, and it provides the minimum of contamination of the sample produced. Employed pulsed lasers in LAL are ns- and ps-, and the usage of fs- lasers are reported recently, as well. The objects of the LAL analyses are ablated craters on the Si target surface and, predominantly, the ablated material. Here, SiNPs are synthesized by ps- laser (150 ps, 1064 nm) ablation of Si single-crystal plates in de-ionized water. The focus of the work is the impact of the additional continuous wave (CW) laser (532nm) on the properties of the ablated material, i.e. SiNPs produced. The comprehensive analyses were performed, including the SiNPs’ size distribution, agglomeration abilities, aging, chemical properties (amount of oxygen and its distribution within the particles), and photoluminescence (PL) properties of the solution produced. It is demonstrated that PL properties of obtained SiNPs solution are impacted by introducing the CW laser in the ablation process. The peculiarity lies in the fact that such impact depends on both the PL excitation wavelength and the power of the introduced CW laser, which might open the possibility of successful tailoring of SiNPs produced by LAL.
C3  - SPIG 2022 : 31st Summer School and International Symposium on the Physics of Ionized Gases : Contributed papers and abstracts
T1  - Picosecond pulsed laser ablation of silicon single crystal
VL  - 102
SP  - 81
EP  - 81
UR  - https://hdl.handle.net/21.15107/rcub_vinar_12095
ER  - 

@conference{
author = "Popović, D. M. and Kushima, A. and Zekić, A. A. and Kasalica, B. and Stašić, Jelena and Ciganović, Jovan and Bogdanović, M. and Trtica, Milan",
year = "2022",
abstract = "Silicon-based nanoparticles (SiNPs) attract authors’ attention due its application prospects in a mutual field, from energy storage to bio-imaging. One of the most prominent methods for synthesis of SiNPs is pulsed laser ablation in liquid media (LAL), because it is simple, and it provides the minimum of contamination of the sample produced. Employed pulsed lasers in LAL are ns- and ps-, and the usage of fs- lasers are reported recently, as well. The objects of the LAL analyses are ablated craters on the Si target surface and, predominantly, the ablated material. Here, SiNPs are synthesized by ps- laser (150 ps, 1064 nm) ablation of Si single-crystal plates in de-ionized water. The focus of the work is the impact of the additional continuous wave (CW) laser (532nm) on the properties of the ablated material, i.e. SiNPs produced. The comprehensive analyses were performed, including the SiNPs’ size distribution, agglomeration abilities, aging, chemical properties (amount of oxygen and its distribution within the particles), and photoluminescence (PL) properties of the solution produced. It is demonstrated that PL properties of obtained SiNPs solution are impacted by introducing the CW laser in the ablation process. The peculiarity lies in the fact that such impact depends on both the PL excitation wavelength and the power of the introduced CW laser, which might open the possibility of successful tailoring of SiNPs produced by LAL.",
journal = "SPIG 2022 : 31st Summer School and International Symposium on the Physics of Ionized Gases : Contributed papers and abstracts",
title = "Picosecond pulsed laser ablation of silicon single crystal",
volume = "102",
pages = "81-81",
url = "https://hdl.handle.net/21.15107/rcub_vinar_12095"
}

Popović, D. M., Kushima, A., Zekić, A. A., Kasalica, B., Stašić, J., Ciganović, J., Bogdanović, M.,& Trtica, M.. (2022). Picosecond pulsed laser ablation of silicon single crystal. in SPIG 2022 : 31st Summer School and International Symposium on the Physics of Ionized Gases : Contributed papers and abstracts, 102, 81-81.
https://hdl.handle.net/21.15107/rcub_vinar_12095

Popović DM, Kushima A, Zekić AA, Kasalica B, Stašić J, Ciganović J, Bogdanović M, Trtica M. Picosecond pulsed laser ablation of silicon single crystal. in SPIG 2022 : 31st Summer School and International Symposium on the Physics of Ionized Gases : Contributed papers and abstracts. 2022;102:81-81.
https://hdl.handle.net/21.15107/rcub_vinar_12095 .

Popović, D. M., Kushima, A., Zekić, A. A., Kasalica, B., Stašić, Jelena, Ciganović, Jovan, Bogdanović, M., Trtica, Milan, "Picosecond pulsed laser ablation of silicon single crystal" in SPIG 2022 : 31st Summer School and International Symposium on the Physics of Ionized Gases : Contributed papers and abstracts, 102 (2022):81-81,
https://hdl.handle.net/21.15107/rcub_vinar_12095 .

TY  - CONF
AU  - Trtica, Milan
AU  - Stašić, Jelena
AU  - Chen, Xizhang
AU  - Limpouch, Jiri
PY  - 2022
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/12096
AB  - The behavior of Oxide Dispersion Strengthened (ODS) steel with addition of hafnium, as well as AISI 316L steel, at high laser intensity of ~1013 W/cm2  in ambiences of air and vacuum, was studied. Irradiation source was Ti:Sapphire laser operating at 804 nm and pulse length of ~65 fs. Morphological and chemical studies were considered, thus that: (i) given laser intensity induced damages on both steels with the damage being more prominent on AISI 316L steel; (ii) various surface features were present, such as coral-like structure and Laser Induced Periodic Surface Structures (LIPSS), with LIPSS being dominant on the surface; (iii) the interaction was accompanied by generation of plasma above the target, and (iv) chemical analysis has shown that surface elemental content also depends on the ambience used.
C3  - SPIG 2022 : 31st Summer School and International Symposium on the Physics of Ionized Gases : Contributed papers and abstracts
T1  - ODS+Hf and AISI 316L steel surface variations at high laser intensity, 1013 W/cm2, in air and vacuum: comparative study
VL  - 102
SP  - 145
EP  - 148
UR  - https://hdl.handle.net/21.15107/rcub_vinar_12096
ER  - 

@conference{
author = "Trtica, Milan and Stašić, Jelena and Chen, Xizhang and Limpouch, Jiri",
year = "2022",
abstract = "The behavior of Oxide Dispersion Strengthened (ODS) steel with addition of hafnium, as well as AISI 316L steel, at high laser intensity of ~1013 W/cm2  in ambiences of air and vacuum, was studied. Irradiation source was Ti:Sapphire laser operating at 804 nm and pulse length of ~65 fs. Morphological and chemical studies were considered, thus that: (i) given laser intensity induced damages on both steels with the damage being more prominent on AISI 316L steel; (ii) various surface features were present, such as coral-like structure and Laser Induced Periodic Surface Structures (LIPSS), with LIPSS being dominant on the surface; (iii) the interaction was accompanied by generation of plasma above the target, and (iv) chemical analysis has shown that surface elemental content also depends on the ambience used.",
journal = "SPIG 2022 : 31st Summer School and International Symposium on the Physics of Ionized Gases : Contributed papers and abstracts",
title = "ODS+Hf and AISI 316L steel surface variations at high laser intensity, 1013 W/cm2, in air and vacuum: comparative study",
volume = "102",
pages = "145-148",
url = "https://hdl.handle.net/21.15107/rcub_vinar_12096"
}

Trtica, M., Stašić, J., Chen, X.,& Limpouch, J.. (2022). ODS+Hf and AISI 316L steel surface variations at high laser intensity, 1013 W/cm2, in air and vacuum: comparative study. in SPIG 2022 : 31st Summer School and International Symposium on the Physics of Ionized Gases : Contributed papers and abstracts, 102, 145-148.
https://hdl.handle.net/21.15107/rcub_vinar_12096

Trtica M, Stašić J, Chen X, Limpouch J. ODS+Hf and AISI 316L steel surface variations at high laser intensity, 1013 W/cm2, in air and vacuum: comparative study. in SPIG 2022 : 31st Summer School and International Symposium on the Physics of Ionized Gases : Contributed papers and abstracts. 2022;102:145-148.
https://hdl.handle.net/21.15107/rcub_vinar_12096 .

Trtica, Milan, Stašić, Jelena, Chen, Xizhang, Limpouch, Jiri, "ODS+Hf and AISI 316L steel surface variations at high laser intensity, 1013 W/cm2, in air and vacuum: comparative study" in SPIG 2022 : 31st Summer School and International Symposium on the Physics of Ionized Gases : Contributed papers and abstracts, 102 (2022):145-148,
https://hdl.handle.net/21.15107/rcub_vinar_12096 .

TY  - JOUR
AU  - Ružić, Jovana
AU  - Simić, Marko
AU  - Stoimenov, Nikolay
AU  - Božić, Dušan
AU  - Stašić, Jelena
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9629
AB  - Metal matrix composites (MMCs) belong to a group of modern materials owing to their excellent technological, mechanical, and physical properties such as excellent wear and corrosion resistance, high electrical and thermal conductivity, improved strength and hardness. Final properties of MMCs are affected equally by all steps of its manufacturing process. It is shown that by using adequate process parameters to obtain starting materials (reaching the specific size, shape, and reactivity) the control of volume fraction and distribution of reinforcements within the matrix can be achieved. For this purpose, mechanical alloying has been appointed as a good approach. MMCs can be produced using powder metallurgy, ingot metallurgy, and additive manufacturing techniques. Combining high-energy ball milling with these techniques enables the design of an innovative processing route for MMCs manufacturing. Mechanochemical process (achieved using high-energy ball milling) was employed in three manufacturing procedures: hot pressing, compocasting, and laser melting/sintering for obtaining of the suitable powder. These production routes for MMCs manufacturing were the subject of this work. The aim of MMCs design is to establish an optimal combination of production techniques merged into the cost-effective fabrication route for obtaining MMCs with required properties.
T2  - Metallurgical and Materials Engineering
T1  - Innovative processing routes in manufacturing of metal matrix composite materials
VL  - 27
IS  - 1
SP  - 1
EP  - 13
DO  - 10.30544/629
ER  - 

@article{
author = "Ružić, Jovana and Simić, Marko and Stoimenov, Nikolay and Božić, Dušan and Stašić, Jelena",
year = "2021",
abstract = "Metal matrix composites (MMCs) belong to a group of modern materials owing to their excellent technological, mechanical, and physical properties such as excellent wear and corrosion resistance, high electrical and thermal conductivity, improved strength and hardness. Final properties of MMCs are affected equally by all steps of its manufacturing process. It is shown that by using adequate process parameters to obtain starting materials (reaching the specific size, shape, and reactivity) the control of volume fraction and distribution of reinforcements within the matrix can be achieved. For this purpose, mechanical alloying has been appointed as a good approach. MMCs can be produced using powder metallurgy, ingot metallurgy, and additive manufacturing techniques. Combining high-energy ball milling with these techniques enables the design of an innovative processing route for MMCs manufacturing. Mechanochemical process (achieved using high-energy ball milling) was employed in three manufacturing procedures: hot pressing, compocasting, and laser melting/sintering for obtaining of the suitable powder. These production routes for MMCs manufacturing were the subject of this work. The aim of MMCs design is to establish an optimal combination of production techniques merged into the cost-effective fabrication route for obtaining MMCs with required properties.",
journal = "Metallurgical and Materials Engineering",
title = "Innovative processing routes in manufacturing of metal matrix composite materials",
volume = "27",
number = "1",
pages = "1-13",
doi = "10.30544/629"
}

Ružić, J., Simić, M., Stoimenov, N., Božić, D.,& Stašić, J.. (2021). Innovative processing routes in manufacturing of metal matrix composite materials. in Metallurgical and Materials Engineering, 27(1), 1-13.
https://doi.org/10.30544/629

Ružić J, Simić M, Stoimenov N, Božić D, Stašić J. Innovative processing routes in manufacturing of metal matrix composite materials. in Metallurgical and Materials Engineering. 2021;27(1):1-13.
doi:10.30544/629 .

Ružić, Jovana, Simić, Marko, Stoimenov, Nikolay, Božić, Dušan, Stašić, Jelena, "Innovative processing routes in manufacturing of metal matrix composite materials" in Metallurgical and Materials Engineering, 27, no. 1 (2021):1-13,
https://doi.org/10.30544/629 . .

TY  - CONF
AU  - Stašić, Jelena
AU  - Trtica, Milan
AU  - Batani, D.
AU  - Benocci, R.
AU  - Narayanan, V.
AU  - Žekić, A.
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10912
AB  - The study deals with morphological effects on the silver target irradiated with ultrashort laser pulses in liquid (water). Synthesis of metal nanostructures (NS) by laser ablation in liquid is a relatively new method with benefits including clean production, without the use of additional chemicals necessary in conventional techniques, obtaining of pure particles with no surfactants, and good stability of the colloid. There are fewer studies, however, concerning the effects on the target itself during the laser action, and this type of research could lead to a better understanding of the physics involved and therefore better control of the process by linking the induced morphological features with NS synthesis results – yield, size distribution, etc. Also, reports on the laser ablation parameters of silver in liquid environment are scarce and significant for every particular set of parameters (laser pulse length, other laser parameters, liquid type). In this work, Ag target was irradiated with laser pulses 40 ps long, at 1064 nm wavelength and 10 Hz repetition rate. Irradiation time was 5 min, and pulse energies ranged from 0.5 mJ to around 22 mJ. Submicron particles were synthesized for all energies above 1 mJ and their size varied from tens of nanometers to ~200 nm. Optimum results were obtained for energies ~14- 17 mJ. Ablation depths were in the range of 30 to 100 µm for the above mentioned energy range. Damage threshold fluence was determined to be around 0.7 J/cm2 . Surface features were distinctly different than in air with sponge-like structure.
PB  - Belgrade : Institute of Physics Belgrade
C3  - PHOTONICA2021 : 8th International School and Conference on Photonics and HEMMAGINERO workshop : Abstracts of Tutorial, Keynote, Invited Lectures, Progress Reports and Contributed Papers; August 23-27, 2021; Belgrade
T1  - Morphological study of silver in the conditions of ultrashort laser ablation in liquid
SP  - 149
UR  - https://hdl.handle.net/21.15107/rcub_vinar_10912
ER  - 

@conference{
author = "Stašić, Jelena and Trtica, Milan and Batani, D. and Benocci, R. and Narayanan, V. and Žekić, A.",
year = "2021",
abstract = "The study deals with morphological effects on the silver target irradiated with ultrashort laser pulses in liquid (water). Synthesis of metal nanostructures (NS) by laser ablation in liquid is a relatively new method with benefits including clean production, without the use of additional chemicals necessary in conventional techniques, obtaining of pure particles with no surfactants, and good stability of the colloid. There are fewer studies, however, concerning the effects on the target itself during the laser action, and this type of research could lead to a better understanding of the physics involved and therefore better control of the process by linking the induced morphological features with NS synthesis results – yield, size distribution, etc. Also, reports on the laser ablation parameters of silver in liquid environment are scarce and significant for every particular set of parameters (laser pulse length, other laser parameters, liquid type). In this work, Ag target was irradiated with laser pulses 40 ps long, at 1064 nm wavelength and 10 Hz repetition rate. Irradiation time was 5 min, and pulse energies ranged from 0.5 mJ to around 22 mJ. Submicron particles were synthesized for all energies above 1 mJ and their size varied from tens of nanometers to ~200 nm. Optimum results were obtained for energies ~14- 17 mJ. Ablation depths were in the range of 30 to 100 µm for the above mentioned energy range. Damage threshold fluence was determined to be around 0.7 J/cm2 . Surface features were distinctly different than in air with sponge-like structure.",
publisher = "Belgrade : Institute of Physics Belgrade",
journal = "PHOTONICA2021 : 8th International School and Conference on Photonics and HEMMAGINERO workshop : Abstracts of Tutorial, Keynote, Invited Lectures, Progress Reports and Contributed Papers; August 23-27, 2021; Belgrade",
title = "Morphological study of silver in the conditions of ultrashort laser ablation in liquid",
pages = "149",
url = "https://hdl.handle.net/21.15107/rcub_vinar_10912"
}

Stašić, J., Trtica, M., Batani, D., Benocci, R., Narayanan, V.,& Žekić, A.. (2021). Morphological study of silver in the conditions of ultrashort laser ablation in liquid. in PHOTONICA2021 : 8th International School and Conference on Photonics and HEMMAGINERO workshop : Abstracts of Tutorial, Keynote, Invited Lectures, Progress Reports and Contributed Papers; August 23-27, 2021; Belgrade
Belgrade : Institute of Physics Belgrade., 149.
https://hdl.handle.net/21.15107/rcub_vinar_10912

Stašić J, Trtica M, Batani D, Benocci R, Narayanan V, Žekić A. Morphological study of silver in the conditions of ultrashort laser ablation in liquid. in PHOTONICA2021 : 8th International School and Conference on Photonics and HEMMAGINERO workshop : Abstracts of Tutorial, Keynote, Invited Lectures, Progress Reports and Contributed Papers; August 23-27, 2021; Belgrade. 2021;:149.
https://hdl.handle.net/21.15107/rcub_vinar_10912 .

Stašić, Jelena, Trtica, Milan, Batani, D., Benocci, R., Narayanan, V., Žekić, A., "Morphological study of silver in the conditions of ultrashort laser ablation in liquid" in PHOTONICA2021 : 8th International School and Conference on Photonics and HEMMAGINERO workshop : Abstracts of Tutorial, Keynote, Invited Lectures, Progress Reports and Contributed Papers; August 23-27, 2021; Belgrade (2021):149,
https://hdl.handle.net/21.15107/rcub_vinar_10912 .

TY  - CONF
AU  - Trtica, Milan
AU  - Stašić, Jelena
AU  - Limpouch, Jiri
AU  - Gavrilov, P.
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/12097
AB  - Nuclear fusion (NF) as a source of clean energy is of interest to many governments, research groups, etc., nowadays. In order for NF to be applied in full capacity, certain problems related to plasma physics and reactor technology should be overcome [1]. In the main, there are two approaches at this moment, the first one based on magnetic confinement and the second one based on inertial confinement fusion, i.e. laser concept. Focusing only on the reactor technology, it is of high importance, among other, to apply the reactor materials (RM) possessing high resistance to thermal and radiation (including electromagnetic) flux [2]. In this context, the behavior of fusion RM, particularly potential plasma facing materials (PFM), will be observed. In nuclear reactor, the PFM are exposed to various fluxes such as the neutrons, alfa-particles, electromagnetic, thermal, hydrogen isotopes. These high thermal as well as electromagnetic fluxes can be, in one approximation, simulated by high-intensity laser radiation [3, 4]. Examples of high intensity femtosecond laser – material interaction will be presented in this work. The materials, i.e. candidates for PFM like tungsten, oxide dispersion strengthened (ODS) steel, will be investigated under the action of high laser intensity of the order of 1014 W/cm2  [5, 6]. Also, the presence of hydrogen isotopes in PFM will be analyzed.
C3  - AMPL-2021 : 15TH International conference Pulsed Lasers and Laser Applications : Book of abstracts
T1  - Ultrashort laser - fusion material interaction
VL  - 102
SP  - 6
EP  - 7
UR  - https://hdl.handle.net/21.15107/rcub_vinar_12097
ER  - 

@conference{
author = "Trtica, Milan and Stašić, Jelena and Limpouch, Jiri and Gavrilov, P.",
year = "2021",
abstract = "Nuclear fusion (NF) as a source of clean energy is of interest to many governments, research groups, etc., nowadays. In order for NF to be applied in full capacity, certain problems related to plasma physics and reactor technology should be overcome [1]. In the main, there are two approaches at this moment, the first one based on magnetic confinement and the second one based on inertial confinement fusion, i.e. laser concept. Focusing only on the reactor technology, it is of high importance, among other, to apply the reactor materials (RM) possessing high resistance to thermal and radiation (including electromagnetic) flux [2]. In this context, the behavior of fusion RM, particularly potential plasma facing materials (PFM), will be observed. In nuclear reactor, the PFM are exposed to various fluxes such as the neutrons, alfa-particles, electromagnetic, thermal, hydrogen isotopes. These high thermal as well as electromagnetic fluxes can be, in one approximation, simulated by high-intensity laser radiation [3, 4]. Examples of high intensity femtosecond laser – material interaction will be presented in this work. The materials, i.e. candidates for PFM like tungsten, oxide dispersion strengthened (ODS) steel, will be investigated under the action of high laser intensity of the order of 1014 W/cm2  [5, 6]. Also, the presence of hydrogen isotopes in PFM will be analyzed.",
journal = "AMPL-2021 : 15TH International conference Pulsed Lasers and Laser Applications : Book of abstracts",
title = "Ultrashort laser - fusion material interaction",
volume = "102",
pages = "6-7",
url = "https://hdl.handle.net/21.15107/rcub_vinar_12097"
}

Trtica, M., Stašić, J., Limpouch, J.,& Gavrilov, P.. (2021). Ultrashort laser - fusion material interaction. in AMPL-2021 : 15TH International conference Pulsed Lasers and Laser Applications : Book of abstracts, 102, 6-7.
https://hdl.handle.net/21.15107/rcub_vinar_12097

Trtica M, Stašić J, Limpouch J, Gavrilov P. Ultrashort laser - fusion material interaction. in AMPL-2021 : 15TH International conference Pulsed Lasers and Laser Applications : Book of abstracts. 2021;102:6-7.
https://hdl.handle.net/21.15107/rcub_vinar_12097 .

Trtica, Milan, Stašić, Jelena, Limpouch, Jiri, Gavrilov, P., "Ultrashort laser - fusion material interaction" in AMPL-2021 : 15TH International conference Pulsed Lasers and Laser Applications : Book of abstracts, 102 (2021):6-7,
https://hdl.handle.net/21.15107/rcub_vinar_12097 .

TY  - JOUR
AU  - Stašić, Jelena
AU  - Božić, Dušan
PY  - 2020
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/8913
AB  - Mixed Cu-4Ti (wt.%) and Cu-1.4B (wt.%) powders were separately mechanically alloyed and then homogenized. The obtained powder was laser melted by pulsed Nd:YAG laser and heat treated at 900 °C for 10 h in argon. 3D compacts were characterized by means of digital camera images, optical microscopy and scanning electron microscopy. Micro-structure after laser melting varies regionally due to mixing of two different mechanically alloyed powders and contains in-situ formed microparticles of primary TiB2. Formation of secondary TiB2 nanoparticles was possible only after high temperature heat treatment (900 °C, for 10 h) as concluded from X-ray diffraction analysis, chemical analysis, and microhardness tests of laser melted and heat treated parts. Copper matrix was strengthened to a significantly higher extent after the formation of secondary TiB2 nanoparticles.
T2  - International Journal of Materials Research
T1  - The effect of in-situ formed TiB 2 particles on microstructural and mechanical properties of laser melted copper alloy
VL  - 111
IS  - 2
SP  - 153
EP  - 159
DO  - 10.3139/146.111865
ER  - 

@article{
author = "Stašić, Jelena and Božić, Dušan",
year = "2020",
abstract = "Mixed Cu-4Ti (wt.%) and Cu-1.4B (wt.%) powders were separately mechanically alloyed and then homogenized. The obtained powder was laser melted by pulsed Nd:YAG laser and heat treated at 900 °C for 10 h in argon. 3D compacts were characterized by means of digital camera images, optical microscopy and scanning electron microscopy. Micro-structure after laser melting varies regionally due to mixing of two different mechanically alloyed powders and contains in-situ formed microparticles of primary TiB2. Formation of secondary TiB2 nanoparticles was possible only after high temperature heat treatment (900 °C, for 10 h) as concluded from X-ray diffraction analysis, chemical analysis, and microhardness tests of laser melted and heat treated parts. Copper matrix was strengthened to a significantly higher extent after the formation of secondary TiB2 nanoparticles.",
journal = "International Journal of Materials Research",
title = "The effect of in-situ formed TiB 2 particles on microstructural and mechanical properties of laser melted copper alloy",
volume = "111",
number = "2",
pages = "153-159",
doi = "10.3139/146.111865"
}

Stašić, J.,& Božić, D.. (2020). The effect of in-situ formed TiB 2 particles on microstructural and mechanical properties of laser melted copper alloy. in International Journal of Materials Research, 111(2), 153-159.
https://doi.org/10.3139/146.111865

Stašić J, Božić D. The effect of in-situ formed TiB 2 particles on microstructural and mechanical properties of laser melted copper alloy. in International Journal of Materials Research. 2020;111(2):153-159.
doi:10.3139/146.111865 .

Stašić, Jelena, Božić, Dušan, "The effect of in-situ formed TiB 2 particles on microstructural and mechanical properties of laser melted copper alloy" in International Journal of Materials Research, 111, no. 2 (2020):153-159,
https://doi.org/10.3139/146.111865 . .

TY  - JOUR
AU  - Stašić, Jelena
AU  - Božić, Dušan
PY  - 2020
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/8976
AB  - A comparison was made between layer-by-layer laser melting (LM) of two types of feedstock powders: (1) elemental powder blend and (2) mechanically alloyed powder. LM was done by Nd:YAG laser at 1064 nm (max. average power 100 W) in argon ambience. Samples synthesized were Cu-Ti-TiB2 rectangular tracks (20x6x1 mm), and input parameters of the process: powder layer thickness 100-250 µm, hatch spacing 1 mm, pulse length 4 ms, energy 4 J, pulse repetition rate 20 Hz. Part of the samples was heat-treated in argon at 900 °C, 10 h. Structural characterization of the samples was done using light microscope and scanning electron microscope (SEM). Chemical analysis of the as-obtained laser melted samples was done by inductively coupled plasma-atomic emission spectrometry (ICP-AES). It was established that the microstructure of LM samples was comprised of Cu-Ti and Cu-B solid regions, and in situ formed microparticles of primary TiB2. Only after high-temperature thermal treatment has the secondary TiB2 occurred. Tensile tests showed much higher strengthening in heat-treated samples with mechanically alloyed powder as starting material, where the formation of secondary TiB2 nanoparticles was considerable.
T2  - Science of Sintering
T1  - The effect of synthesis of the starting powders on the properties of Cu-Ti-TiB2 alloy obtained by laser melting
VL  - 52
IS  - 1
SP  - 15
EP  - 23
DO  - 10.2298/SOS2001015S
ER  - 

@article{
author = "Stašić, Jelena and Božić, Dušan",
year = "2020",
abstract = "A comparison was made between layer-by-layer laser melting (LM) of two types of feedstock powders: (1) elemental powder blend and (2) mechanically alloyed powder. LM was done by Nd:YAG laser at 1064 nm (max. average power 100 W) in argon ambience. Samples synthesized were Cu-Ti-TiB2 rectangular tracks (20x6x1 mm), and input parameters of the process: powder layer thickness 100-250 µm, hatch spacing 1 mm, pulse length 4 ms, energy 4 J, pulse repetition rate 20 Hz. Part of the samples was heat-treated in argon at 900 °C, 10 h. Structural characterization of the samples was done using light microscope and scanning electron microscope (SEM). Chemical analysis of the as-obtained laser melted samples was done by inductively coupled plasma-atomic emission spectrometry (ICP-AES). It was established that the microstructure of LM samples was comprised of Cu-Ti and Cu-B solid regions, and in situ formed microparticles of primary TiB2. Only after high-temperature thermal treatment has the secondary TiB2 occurred. Tensile tests showed much higher strengthening in heat-treated samples with mechanically alloyed powder as starting material, where the formation of secondary TiB2 nanoparticles was considerable.",
journal = "Science of Sintering",
title = "The effect of synthesis of the starting powders on the properties of Cu-Ti-TiB2 alloy obtained by laser melting",
volume = "52",
number = "1",
pages = "15-23",
doi = "10.2298/SOS2001015S"
}

Stašić, J.,& Božić, D.. (2020). The effect of synthesis of the starting powders on the properties of Cu-Ti-TiB2 alloy obtained by laser melting. in Science of Sintering, 52(1), 15-23.
https://doi.org/10.2298/SOS2001015S

Stašić J, Božić D. The effect of synthesis of the starting powders on the properties of Cu-Ti-TiB2 alloy obtained by laser melting. in Science of Sintering. 2020;52(1):15-23.
doi:10.2298/SOS2001015S .

Stašić, Jelena, Božić, Dušan, "The effect of synthesis of the starting powders on the properties of Cu-Ti-TiB2 alloy obtained by laser melting" in Science of Sintering, 52, no. 1 (2020):15-23,
https://doi.org/10.2298/SOS2001015S . .

TY  - JOUR
AU  - Trtica, Milan
AU  - Stašić, Jelena
AU  - Limpouch, Jiri
AU  - Gavrilov, Peter T.
AU  - Chen, X.
AU  - Ciganović, Jovan
PY  - 2020
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/8608
AB  - The behavior of 16Cr3Al ODS steel (oxide dispersion strengthened steel), widely employed structural fusion material, under high-intensity laser radiation with intensity up to 10(14)W/cm(2) was investigated in air, helium and vacuum surrounding. Employed system was 65 fs laser at 804 nm, with applied pulse energy up to 5.25 mJ. Morphological effects were studied - cracking, crater parameters (depth, cross-section), LIPSS (laser-induced periodic surface structures) formation at the crater periphery, hydrodynamic effects, as well as chemical variations on the surface. Ablation thresholds were also determined for all three ambiences (for 100 applied pulses), and they were 0.30 J/cm(2), 0.23 J/cm(2) and 0.39 J/cm(2) in air, helium and vacuum, respectively. Plasma occurred in all experiments and it was most prominent in vacuum due to strongest laser-material coupling.
T2  - Fusion Engineering and Design
T1  - Surface behavior of 16Cr3Al ODS steel—Effects of high laser intensity 1014 W/cm2 in ambiences of air, helium and vacuum
VL  - 150
SP  - 111360
DO  - 10.1016/j.fusengdes.2019.111360
ER  - 

@article{
author = "Trtica, Milan and Stašić, Jelena and Limpouch, Jiri and Gavrilov, Peter T. and Chen, X. and Ciganović, Jovan",
year = "2020",
abstract = "The behavior of 16Cr3Al ODS steel (oxide dispersion strengthened steel), widely employed structural fusion material, under high-intensity laser radiation with intensity up to 10(14)W/cm(2) was investigated in air, helium and vacuum surrounding. Employed system was 65 fs laser at 804 nm, with applied pulse energy up to 5.25 mJ. Morphological effects were studied - cracking, crater parameters (depth, cross-section), LIPSS (laser-induced periodic surface structures) formation at the crater periphery, hydrodynamic effects, as well as chemical variations on the surface. Ablation thresholds were also determined for all three ambiences (for 100 applied pulses), and they were 0.30 J/cm(2), 0.23 J/cm(2) and 0.39 J/cm(2) in air, helium and vacuum, respectively. Plasma occurred in all experiments and it was most prominent in vacuum due to strongest laser-material coupling.",
journal = "Fusion Engineering and Design",
title = "Surface behavior of 16Cr3Al ODS steel—Effects of high laser intensity 1014 W/cm2 in ambiences of air, helium and vacuum",
volume = "150",
pages = "111360",
doi = "10.1016/j.fusengdes.2019.111360"
}

Trtica, M., Stašić, J., Limpouch, J., Gavrilov, P. T., Chen, X.,& Ciganović, J.. (2020). Surface behavior of 16Cr3Al ODS steel—Effects of high laser intensity 1014 W/cm2 in ambiences of air, helium and vacuum. in Fusion Engineering and Design, 150, 111360.
https://doi.org/10.1016/j.fusengdes.2019.111360

Trtica M, Stašić J, Limpouch J, Gavrilov PT, Chen X, Ciganović J. Surface behavior of 16Cr3Al ODS steel—Effects of high laser intensity 1014 W/cm2 in ambiences of air, helium and vacuum. in Fusion Engineering and Design. 2020;150:111360.
doi:10.1016/j.fusengdes.2019.111360 .

Trtica, Milan, Stašić, Jelena, Limpouch, Jiri, Gavrilov, Peter T., Chen, X., Ciganović, Jovan, "Surface behavior of 16Cr3Al ODS steel—Effects of high laser intensity 1014 W/cm2 in ambiences of air, helium and vacuum" in Fusion Engineering and Design, 150 (2020):111360,
https://doi.org/10.1016/j.fusengdes.2019.111360 . .

TY  - JOUR
AU  - Stašić, Jelena
AU  - Božić, Dušan
PY  - 2019
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/8447
AB  - Purpose: This paper aims to report the production of 316L-1 Wt.% NiB cubes by using the selective laser melting (SLM) process. The laser used was pulsed, millisecond Nd:YAG system with maximum average power 100 W. Design/methodology/approach: Densification under different processing conditions (pulse energy, average laser power, laser scan speed, powder layer thickness, pulse frequency) was investigated. Morphology, macro and microstructure of laser melted samples were characterized by digital camera images and by scanning electron microscope. Density of the cubes was determined by Archimedes method in water. Vickers microhardness of samples was determined under the load of 25 g. Corrosion behavior of 316L and 316L-NiB samples was conducted in 5 per cent HCl solution at the testing temperature of 20°C during 240 h. Findings: Using laser power of ∼60-70 W, lower beam overlap and powder layer thickness of 200 µm, 3D cubical samples were obtained with significant balling in individual layers and an overall porosity being around 30 per cent. By increasing laser power to ∼80 W, with higher beam overlap and lower powder layer thickness of 100 µm, SLM parts with no balling and the presence of small pores of up to 4 per cent (20 Hz) and 9 per cent (40 Hz) were obtained. With further increase of laser power to 90 W, overall porosity rose to around 12 per cent. The addition of 1 Wt.% NiB to stainless steel negligibly lowered its corrosion resistance in 5 per cent HCl solution. Originality/value: A part from 316L stainless steel with balling-free structure and good density was successfully obtained through pulsed-SLM process with the aid of 1 Wt.% of NiB addition. Aside from significant influence on the improved structure of cubes, NiB had a favorable effect on microhardness values while practically not affecting the corrosion resistivity of the base material in an aggressive surrounding. © 2018, Emerald Publishing Limited.
T2  - Rapid Prototyping Journal
T1  - Densification behavior of 316L-NiB stainless steel powder and surface morphology during selective laser melting process using pulsed Nd:YAG laser
VL  - 25
IS  - 1
SP  - 47
EP  - 54
DO  - 10.1108/RPJ-07-2017-0136
ER  - 

@article{
author = "Stašić, Jelena and Božić, Dušan",
year = "2019",
abstract = "Purpose: This paper aims to report the production of 316L-1 Wt.% NiB cubes by using the selective laser melting (SLM) process. The laser used was pulsed, millisecond Nd:YAG system with maximum average power 100 W. Design/methodology/approach: Densification under different processing conditions (pulse energy, average laser power, laser scan speed, powder layer thickness, pulse frequency) was investigated. Morphology, macro and microstructure of laser melted samples were characterized by digital camera images and by scanning electron microscope. Density of the cubes was determined by Archimedes method in water. Vickers microhardness of samples was determined under the load of 25 g. Corrosion behavior of 316L and 316L-NiB samples was conducted in 5 per cent HCl solution at the testing temperature of 20°C during 240 h. Findings: Using laser power of ∼60-70 W, lower beam overlap and powder layer thickness of 200 µm, 3D cubical samples were obtained with significant balling in individual layers and an overall porosity being around 30 per cent. By increasing laser power to ∼80 W, with higher beam overlap and lower powder layer thickness of 100 µm, SLM parts with no balling and the presence of small pores of up to 4 per cent (20 Hz) and 9 per cent (40 Hz) were obtained. With further increase of laser power to 90 W, overall porosity rose to around 12 per cent. The addition of 1 Wt.% NiB to stainless steel negligibly lowered its corrosion resistance in 5 per cent HCl solution. Originality/value: A part from 316L stainless steel with balling-free structure and good density was successfully obtained through pulsed-SLM process with the aid of 1 Wt.% of NiB addition. Aside from significant influence on the improved structure of cubes, NiB had a favorable effect on microhardness values while practically not affecting the corrosion resistivity of the base material in an aggressive surrounding. © 2018, Emerald Publishing Limited.",
journal = "Rapid Prototyping Journal",
title = "Densification behavior of 316L-NiB stainless steel powder and surface morphology during selective laser melting process using pulsed Nd:YAG laser",
volume = "25",
number = "1",
pages = "47-54",
doi = "10.1108/RPJ-07-2017-0136"
}

Stašić, J.,& Božić, D.. (2019). Densification behavior of 316L-NiB stainless steel powder and surface morphology during selective laser melting process using pulsed Nd:YAG laser. in Rapid Prototyping Journal, 25(1), 47-54.
https://doi.org/10.1108/RPJ-07-2017-0136

Stašić J, Božić D. Densification behavior of 316L-NiB stainless steel powder and surface morphology during selective laser melting process using pulsed Nd:YAG laser. in Rapid Prototyping Journal. 2019;25(1):47-54.
doi:10.1108/RPJ-07-2017-0136 .

Stašić, Jelena, Božić, Dušan, "Densification behavior of 316L-NiB stainless steel powder and surface morphology during selective laser melting process using pulsed Nd:YAG laser" in Rapid Prototyping Journal, 25, no. 1 (2019):47-54,
https://doi.org/10.1108/RPJ-07-2017-0136 . .

TY  - JOUR
AU  - Trtica, Milan
AU  - Limpouch, Jiri
AU  - Stašić, Jelena
AU  - Gavrilov, Peter T.
PY  - 2019
UR  - https://linkinghub.elsevier.com/retrieve/pii/S0169433218324929
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/7871
AB  - The present study deals with modification of tungsten surface with high-intensity (∼1015 W/cm2) femtosecond laser in air and vacuum surrounding. Specific findings include: (a) the applied intensities produce crater-like damages with depth ∼31.0 μm in vacuum and ∼7.2 μm in air; (b) peripheral region of the damages is diffuse in air atmosphere unlike vacuum where it is more sharply defined; (c) hydrodynamic features, while present in vacuum, are dramatically reduced in air; (d) characteristic chemical surface changes occur at the surface, and (e) plasma forms in front of the target in both surroundings. The obtained results imply that the employed intensities, in a certain sense, can be used for simulation of some processes in the fusion reactor and for highly precise material removal and tungsten surface processing (by fine tuning of given fs laser parameters). © 2018 Elsevier B.V.
T2  - Applied Surface Science
T1  - Femtosecond laser-assisted surface modification of tungsten with 1015 W/cm2 intensity in air and vacuum ambience
VL  - 464
SP  - 99
EP  - 107
DO  - 10.1016/j.apsusc.2018.09.074
ER  - 

@article{
author = "Trtica, Milan and Limpouch, Jiri and Stašić, Jelena and Gavrilov, Peter T.",
year = "2019",
abstract = "The present study deals with modification of tungsten surface with high-intensity (∼1015 W/cm2) femtosecond laser in air and vacuum surrounding. Specific findings include: (a) the applied intensities produce crater-like damages with depth ∼31.0 μm in vacuum and ∼7.2 μm in air; (b) peripheral region of the damages is diffuse in air atmosphere unlike vacuum where it is more sharply defined; (c) hydrodynamic features, while present in vacuum, are dramatically reduced in air; (d) characteristic chemical surface changes occur at the surface, and (e) plasma forms in front of the target in both surroundings. The obtained results imply that the employed intensities, in a certain sense, can be used for simulation of some processes in the fusion reactor and for highly precise material removal and tungsten surface processing (by fine tuning of given fs laser parameters). © 2018 Elsevier B.V.",
journal = "Applied Surface Science",
title = "Femtosecond laser-assisted surface modification of tungsten with 1015 W/cm2 intensity in air and vacuum ambience",
volume = "464",
pages = "99-107",
doi = "10.1016/j.apsusc.2018.09.074"
}

Trtica, M., Limpouch, J., Stašić, J.,& Gavrilov, P. T.. (2019). Femtosecond laser-assisted surface modification of tungsten with 1015 W/cm2 intensity in air and vacuum ambience. in Applied Surface Science, 464, 99-107.
https://doi.org/10.1016/j.apsusc.2018.09.074

Trtica M, Limpouch J, Stašić J, Gavrilov PT. Femtosecond laser-assisted surface modification of tungsten with 1015 W/cm2 intensity in air and vacuum ambience. in Applied Surface Science. 2019;464:99-107.
doi:10.1016/j.apsusc.2018.09.074 .

Trtica, Milan, Limpouch, Jiri, Stašić, Jelena, Gavrilov, Peter T., "Femtosecond laser-assisted surface modification of tungsten with 1015 W/cm2 intensity in air and vacuum ambience" in Applied Surface Science, 464 (2019):99-107,
https://doi.org/10.1016/j.apsusc.2018.09.074 . .

TY  - CONF
AU  - Trtica, Milan
AU  - Stašić, Jelena
AU  - Batani, D.
AU  - Benocci, R.
AU  - Narayanan, V.
AU  - Ciganović, Jovan
PY  - 2019
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11886
AB  - Titanium target was irradiated by picosecond lasers with pulse length of 40 ps i.e. 150 ps in air and water environment. The goal was studying of the induced surface features in both ambiences, as well as synthesis of Ti-based nanoparticles in liquid. Morphologies of the target at both pulse lengths were studied by standard techniques, e.g. scanning electron microscope (SEM) and profilometry, while chemical analysis of the surface was done by energy-dispersive spectrometry (EDS). Interaction ps laser-Ti depends on a number of parameters – laser parameters, condition of the target surface, working ambience, etc. Irradiation conditions in this work were as follows: τ = 40/150 ps, wavelength 1064 nm, pulse frequency 10 Hz, pulse energy 2-20 mJ, pulse count 3000-9000, irradiation in focusing regime. Generally, induced features differ in air and water surrounding – damage is more diffuse in water, with characteristic wavy surface. In both media laser-induced periodic surface structures (LIPSS) are observed on the damage periphery, however they appear at lower pulse count in water. Irradiation of Ti in water led to creation of nanoparticles (NPs) in most cases as established by UV-Vis spectrophotometry, while their size distribution was determined by DLS (dynamic light scattering) analysis. These were, as expected, Ti-oxide NPs as laser ablation in water always leads to formation of oxide particles except in case of noble metals. The size and shape of NPs obtained using laser ablation in liquid (LAL) method depends strongly on the liquid medium used, as well as laser parameters. In our case NPs were spherical, sized from few tens to few hundreds of nanometers, with occurrence of smaller particles in case of 150 ps laser. With further optimization of conditions obtaining of smaller NPs can be expected.
PB  - Belgrade : Vinča Institute of Nuclear Sciences, University of Belgrade
C3  - PHOTONICA2019 : 7th International School and Conference on Photonics & Machine Learning with Photonics Symposium : Book of abstracts
T1  - Titanium target irradiation by picosecond laser in air and water – surface morphology and synthesis of nanoparticles
SP  - 163
EP  - 163
UR  - https://hdl.handle.net/21.15107/rcub_vinar_11886
ER  - 

@conference{
author = "Trtica, Milan and Stašić, Jelena and Batani, D. and Benocci, R. and Narayanan, V. and Ciganović, Jovan",
year = "2019",
abstract = "Titanium target was irradiated by picosecond lasers with pulse length of 40 ps i.e. 150 ps in air and water environment. The goal was studying of the induced surface features in both ambiences, as well as synthesis of Ti-based nanoparticles in liquid. Morphologies of the target at both pulse lengths were studied by standard techniques, e.g. scanning electron microscope (SEM) and profilometry, while chemical analysis of the surface was done by energy-dispersive spectrometry (EDS). Interaction ps laser-Ti depends on a number of parameters – laser parameters, condition of the target surface, working ambience, etc. Irradiation conditions in this work were as follows: τ = 40/150 ps, wavelength 1064 nm, pulse frequency 10 Hz, pulse energy 2-20 mJ, pulse count 3000-9000, irradiation in focusing regime. Generally, induced features differ in air and water surrounding – damage is more diffuse in water, with characteristic wavy surface. In both media laser-induced periodic surface structures (LIPSS) are observed on the damage periphery, however they appear at lower pulse count in water. Irradiation of Ti in water led to creation of nanoparticles (NPs) in most cases as established by UV-Vis spectrophotometry, while their size distribution was determined by DLS (dynamic light scattering) analysis. These were, as expected, Ti-oxide NPs as laser ablation in water always leads to formation of oxide particles except in case of noble metals. The size and shape of NPs obtained using laser ablation in liquid (LAL) method depends strongly on the liquid medium used, as well as laser parameters. In our case NPs were spherical, sized from few tens to few hundreds of nanometers, with occurrence of smaller particles in case of 150 ps laser. With further optimization of conditions obtaining of smaller NPs can be expected.",
publisher = "Belgrade : Vinča Institute of Nuclear Sciences, University of Belgrade",
journal = "PHOTONICA2019 : 7th International School and Conference on Photonics & Machine Learning with Photonics Symposium : Book of abstracts",
title = "Titanium target irradiation by picosecond laser in air and water – surface morphology and synthesis of nanoparticles",
pages = "163-163",
url = "https://hdl.handle.net/21.15107/rcub_vinar_11886"
}

Trtica, M., Stašić, J., Batani, D., Benocci, R., Narayanan, V.,& Ciganović, J.. (2019). Titanium target irradiation by picosecond laser in air and water – surface morphology and synthesis of nanoparticles. in PHOTONICA2019 : 7th International School and Conference on Photonics & Machine Learning with Photonics Symposium : Book of abstracts
Belgrade : Vinča Institute of Nuclear Sciences, University of Belgrade., 163-163.
https://hdl.handle.net/21.15107/rcub_vinar_11886

Trtica M, Stašić J, Batani D, Benocci R, Narayanan V, Ciganović J. Titanium target irradiation by picosecond laser in air and water – surface morphology and synthesis of nanoparticles. in PHOTONICA2019 : 7th International School and Conference on Photonics & Machine Learning with Photonics Symposium : Book of abstracts. 2019;:163-163.
https://hdl.handle.net/21.15107/rcub_vinar_11886 .

Trtica, Milan, Stašić, Jelena, Batani, D., Benocci, R., Narayanan, V., Ciganović, Jovan, "Titanium target irradiation by picosecond laser in air and water – surface morphology and synthesis of nanoparticles" in PHOTONICA2019 : 7th International School and Conference on Photonics & Machine Learning with Photonics Symposium : Book of abstracts (2019):163-163,
https://hdl.handle.net/21.15107/rcub_vinar_11886 .