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  - 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  - 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  - 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  - 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  - JOUR
AU  - Bhattacharya, Somesh Kr.
AU  - Sahara, Ryoji
AU  - Božić, Dušan
AU  - Ružić, Jovana
PY  - 2020
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9524
AB  - Copper matrix composite materials have exhibited a high potential in applications where excellent conductivity and mechanical properties are required. In this study, the machine learning models have been applied to predict the hardness of the copper matrix composite materials (CuMCs) produced via the powder metallurgy technique. Six different machine learning regression models were employed. The observed CuMCs were reinforced with two different volume fractions (2 vol.% and 7vol.%) of ZrB2 particles. Based on experimental work, we extracted the independent variables (features) like the milling time (MT, Hours), dislocation density (DD, m-2), average particle size (PS, μm), density (ρ, g/cm3), and yield stress (σ, MPa) while the Vickers hardness (MPa) was used as the dependent variable. Feature selection was performed by calculation the Pearson correlation coefficient (PCC) between the independent and dependent variables. The predictive accuracy higher than 80% was achieved for Cu-7vol.% ZrB2 and lower for the Cu-2vol.% ZrB2.
T2  - Metallurgical and Materials Engineering
T1  - Data analytics approach to predict the hardness of copper matrix composites
VL  - 26
IS  - 4
SP  - 357
EP  - 364
DO  - 10.30544/567
ER  - 

@article{
author = "Bhattacharya, Somesh Kr. and Sahara, Ryoji and Božić, Dušan and Ružić, Jovana",
year = "2020",
abstract = "Copper matrix composite materials have exhibited a high potential in applications where excellent conductivity and mechanical properties are required. In this study, the machine learning models have been applied to predict the hardness of the copper matrix composite materials (CuMCs) produced via the powder metallurgy technique. Six different machine learning regression models were employed. The observed CuMCs were reinforced with two different volume fractions (2 vol.% and 7vol.%) of ZrB2 particles. Based on experimental work, we extracted the independent variables (features) like the milling time (MT, Hours), dislocation density (DD, m-2), average particle size (PS, μm), density (ρ, g/cm3), and yield stress (σ, MPa) while the Vickers hardness (MPa) was used as the dependent variable. Feature selection was performed by calculation the Pearson correlation coefficient (PCC) between the independent and dependent variables. The predictive accuracy higher than 80% was achieved for Cu-7vol.% ZrB2 and lower for the Cu-2vol.% ZrB2.",
journal = "Metallurgical and Materials Engineering",
title = "Data analytics approach to predict the hardness of copper matrix composites",
volume = "26",
number = "4",
pages = "357-364",
doi = "10.30544/567"
}

Bhattacharya, S. Kr., Sahara, R., Božić, D.,& Ružić, J.. (2020). Data analytics approach to predict the hardness of copper matrix composites. in Metallurgical and Materials Engineering, 26(4), 357-364.
https://doi.org/10.30544/567

Bhattacharya SK, Sahara R, Božić D, Ružić J. Data analytics approach to predict the hardness of copper matrix composites. in Metallurgical and Materials Engineering. 2020;26(4):357-364.
doi:10.30544/567 .

Bhattacharya, Somesh Kr., Sahara, Ryoji, Božić, Dušan, Ružić, Jovana, "Data analytics approach to predict the hardness of copper matrix composites" in Metallurgical and Materials Engineering, 26, no. 4 (2020):357-364,
https://doi.org/10.30544/567 . .

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  - 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  - Božić, Dušan
AU  - Stanković, Nadežda
AU  - Ružić, Jovana
AU  - Stašić, Jelena
PY  - 2018
UR  - http://link.springer.com/10.1007/s00170-018-1839-7
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/7752
AB  - The sintering of Fe-Cu and Fe-Cu-Ni3Al powder compacts by laser beam was studied to determine densification, microstructural development, and microhardness before and after thermo-mechanical treatments. Laser sintering (LS) was conducted using pulsed Nd:YAG laser, and optimum parameters of pulse energy, pulse length, pulse frequency, scanning speed, hatch spacing, and layer thickness were determined. Also, the effects of solidification rate, cold deformation (10%), and the addition of complex intermetallic Ni3Al (Fe, Ti, B) on microhardness were analyzed before and after the aging process. It was concluded that rapidly solidified structure, as well as the presence of Ni3Al particles and metastable CuFe phase, which are a product of laser sintering, affected a higher degree of iron matrix hardening which was retained up to high temperatures. Originality of investigations presented in this paper is in the employment of laser for synthesis of Fe-Cu-Ni3Al alloy, which was not discussed in the literature so far. Realization of this complex synthesis required consideration and adaptation of the laser sintering method which has been successfully applied for other types of alloys.
T2  - The International Journal of Advanced Manufacturing Technology
T1  - Synthesis and multiple hardening of a rapidly solidified iron-based matrix
VL  - 96
IS  - 9-12
SP  - 4009
EP  - 4019
DO  - 10.1007/s00170-018-1839-7
ER  - 

@article{
author = "Božić, Dušan and Stanković, Nadežda and Ružić, Jovana and Stašić, Jelena",
year = "2018",
abstract = "The sintering of Fe-Cu and Fe-Cu-Ni3Al powder compacts by laser beam was studied to determine densification, microstructural development, and microhardness before and after thermo-mechanical treatments. Laser sintering (LS) was conducted using pulsed Nd:YAG laser, and optimum parameters of pulse energy, pulse length, pulse frequency, scanning speed, hatch spacing, and layer thickness were determined. Also, the effects of solidification rate, cold deformation (10%), and the addition of complex intermetallic Ni3Al (Fe, Ti, B) on microhardness were analyzed before and after the aging process. It was concluded that rapidly solidified structure, as well as the presence of Ni3Al particles and metastable CuFe phase, which are a product of laser sintering, affected a higher degree of iron matrix hardening which was retained up to high temperatures. Originality of investigations presented in this paper is in the employment of laser for synthesis of Fe-Cu-Ni3Al alloy, which was not discussed in the literature so far. Realization of this complex synthesis required consideration and adaptation of the laser sintering method which has been successfully applied for other types of alloys.",
journal = "The International Journal of Advanced Manufacturing Technology",
title = "Synthesis and multiple hardening of a rapidly solidified iron-based matrix",
volume = "96",
number = "9-12",
pages = "4009-4019",
doi = "10.1007/s00170-018-1839-7"
}

Božić, D., Stanković, N., Ružić, J.,& Stašić, J.. (2018). Synthesis and multiple hardening of a rapidly solidified iron-based matrix. in The International Journal of Advanced Manufacturing Technology, 96(9-12), 4009-4019.
https://doi.org/10.1007/s00170-018-1839-7

Božić D, Stanković N, Ružić J, Stašić J. Synthesis and multiple hardening of a rapidly solidified iron-based matrix. in The International Journal of Advanced Manufacturing Technology. 2018;96(9-12):4009-4019.
doi:10.1007/s00170-018-1839-7 .

Božić, Dušan, Stanković, Nadežda, Ružić, Jovana, Stašić, Jelena, "Synthesis and multiple hardening of a rapidly solidified iron-based matrix" in The International Journal of Advanced Manufacturing Technology, 96, no. 9-12 (2018):4009-4019,
https://doi.org/10.1007/s00170-018-1839-7 . .

TY  - JOUR
AU  - Stašić, Jelena
AU  - Božić, Dušan
PY  - 2018
UR  - https://linkinghub.elsevier.com/retrieve/pii/S0925838818318425
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/7702
AB  - Homogenized Cu-4Ti (wt%) and Cu-4Ti-1.4B (wt%) powders were cold pressed and then sintered by pulsed, millisecond Nd:YAG laser system. Phases present in laser sintered samples were characterized by X-ray diffraction (XRD), while quantitative chemical analysis of the sintered samples was conducted using inductively coupled plasma-atomic emission spectrometry (ICP-AES). The microstructure of powders and laser sintered foils was examined with scanning electron microscope with an energy dispersive X-ray spectroscope (EDS). Optical microscopy was used also for microstructural characterization of the foils. The tensile test was carried out using a universal testing machine with a crosshead speed of 0.5 mm/min at room temperature. Foils with dimensions 20 × 6 × 0.4 mm were used for tensile testing. In the obtained Cu-Ti foils, after aging at 550 °C for 4 h, rapidly solidified structure and metastable Cu4Ti precipitates affected high degree of copper matrix strengthening (peak aged). In Cu-Ti-TiB2foils, after aging at 550 °C for 3 h, rapidly solidified structure, as well as the presence of TiB2particles and metastable Cu4Ti precipitates, also affected high degree of copper matrix strengthening which, thanks to the ceramic particles, is retained at longer times (6 h). Fractured surfaces were observed with an optical microscope. It was determined that the best structural and mechanical properties of laser-sintered foils were reached using the following parameters: laser frequency 4 Hz, laser pulse duration 9 ms, pulse energy ∼20 J, number of scans 2.
T2  - Journal of Alloys and Compounds
T1  - Obtaining of reinforced Cu-Ti, Cu-Ti-TiB 2 foils through green compact laser sintering
VL  - 762
SP  - 231
EP  - 236
DO  - 10.1016/j.jallcom.2018.05.135
ER  - 

@article{
author = "Stašić, Jelena and Božić, Dušan",
year = "2018",
abstract = "Homogenized Cu-4Ti (wt%) and Cu-4Ti-1.4B (wt%) powders were cold pressed and then sintered by pulsed, millisecond Nd:YAG laser system. Phases present in laser sintered samples were characterized by X-ray diffraction (XRD), while quantitative chemical analysis of the sintered samples was conducted using inductively coupled plasma-atomic emission spectrometry (ICP-AES). The microstructure of powders and laser sintered foils was examined with scanning electron microscope with an energy dispersive X-ray spectroscope (EDS). Optical microscopy was used also for microstructural characterization of the foils. The tensile test was carried out using a universal testing machine with a crosshead speed of 0.5 mm/min at room temperature. Foils with dimensions 20 × 6 × 0.4 mm were used for tensile testing. In the obtained Cu-Ti foils, after aging at 550 °C for 4 h, rapidly solidified structure and metastable Cu4Ti precipitates affected high degree of copper matrix strengthening (peak aged). In Cu-Ti-TiB2foils, after aging at 550 °C for 3 h, rapidly solidified structure, as well as the presence of TiB2particles and metastable Cu4Ti precipitates, also affected high degree of copper matrix strengthening which, thanks to the ceramic particles, is retained at longer times (6 h). Fractured surfaces were observed with an optical microscope. It was determined that the best structural and mechanical properties of laser-sintered foils were reached using the following parameters: laser frequency 4 Hz, laser pulse duration 9 ms, pulse energy ∼20 J, number of scans 2.",
journal = "Journal of Alloys and Compounds",
title = "Obtaining of reinforced Cu-Ti, Cu-Ti-TiB 2 foils through green compact laser sintering",
volume = "762",
pages = "231-236",
doi = "10.1016/j.jallcom.2018.05.135"
}

Stašić, J.,& Božić, D.. (2018). Obtaining of reinforced Cu-Ti, Cu-Ti-TiB 2 foils through green compact laser sintering. in Journal of Alloys and Compounds, 762, 231-236.
https://doi.org/10.1016/j.jallcom.2018.05.135

Stašić J, Božić D. Obtaining of reinforced Cu-Ti, Cu-Ti-TiB 2 foils through green compact laser sintering. in Journal of Alloys and Compounds. 2018;762:231-236.
doi:10.1016/j.jallcom.2018.05.135 .

Stašić, Jelena, Božić, Dušan, "Obtaining of reinforced Cu-Ti, Cu-Ti-TiB 2 foils through green compact laser sintering" in Journal of Alloys and Compounds, 762 (2018):231-236,
https://doi.org/10.1016/j.jallcom.2018.05.135 . .

TY  - JOUR
AU  - Dimčić, Biljana
AU  - Stašić, Jelena
AU  - Ružić, Jovana
AU  - Božić, Dušan
PY  - 2017
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/1505
AB  - The influence of microstructure, heat treatment and alloying addition on mechanical and fracture properties of Ti3Al-based intermetallic at room and elevated temperatures was studied. Ti3Al-11Nb-1Mo (mole fraction, %) alloy was consolidated via powder metallurgy processing by mechanical alloying (MA) and hot pressing (HP). MA powders were characterized using XRD and SEM-EDS. Optimum MA duration was 25 h and HP conditions of 1350 degrees C, 2 h, 35 MPa. After HP, solution treatment at 1050 degrees C for 1 h and water quenching alpha(2)+beta WidmanstAtten microstructure is present, while subsequent aging at 800 degrees C during 24 h induces small content of O-phase. High fraction of beta-phase is a direct consequence of Mo. Compression tests were performed from room temperature to 750 degrees C in vacuum. The yield strength of compacts increases with temperature up to 250 degrees C (pyramidal slip systems activation), after which it decreases. Ductility increases throughout the whole temperature range. The presence of O phase contributed to ductility increase in aged alloys, while negligibly lowering yield strength. Registered drop in the yield strength of aged alloys compared with non-aged ones was mostly influenced by precipitation of a. 2 particles. Mixed fracture modes are operative at all temperatures.
T2  - Transactions of Nonferrous Metals Society of China
T1  - Effect of synthesis parameters on structural and mechanical properties of Ti3Al-Nb-Mo intermetallic compound obtained by powder metallurgy techniques
VL  - 27
IS  - 3
SP  - 527
EP  - 537
DO  - 10.1016/S1003-6326(17)60059-1
ER  - 

@article{
author = "Dimčić, Biljana and Stašić, Jelena and Ružić, Jovana and Božić, Dušan",
year = "2017",
abstract = "The influence of microstructure, heat treatment and alloying addition on mechanical and fracture properties of Ti3Al-based intermetallic at room and elevated temperatures was studied. Ti3Al-11Nb-1Mo (mole fraction, %) alloy was consolidated via powder metallurgy processing by mechanical alloying (MA) and hot pressing (HP). MA powders were characterized using XRD and SEM-EDS. Optimum MA duration was 25 h and HP conditions of 1350 degrees C, 2 h, 35 MPa. After HP, solution treatment at 1050 degrees C for 1 h and water quenching alpha(2)+beta WidmanstAtten microstructure is present, while subsequent aging at 800 degrees C during 24 h induces small content of O-phase. High fraction of beta-phase is a direct consequence of Mo. Compression tests were performed from room temperature to 750 degrees C in vacuum. The yield strength of compacts increases with temperature up to 250 degrees C (pyramidal slip systems activation), after which it decreases. Ductility increases throughout the whole temperature range. The presence of O phase contributed to ductility increase in aged alloys, while negligibly lowering yield strength. Registered drop in the yield strength of aged alloys compared with non-aged ones was mostly influenced by precipitation of a. 2 particles. Mixed fracture modes are operative at all temperatures.",
journal = "Transactions of Nonferrous Metals Society of China",
title = "Effect of synthesis parameters on structural and mechanical properties of Ti3Al-Nb-Mo intermetallic compound obtained by powder metallurgy techniques",
volume = "27",
number = "3",
pages = "527-537",
doi = "10.1016/S1003-6326(17)60059-1"
}

Dimčić, B., Stašić, J., Ružić, J.,& Božić, D.. (2017). Effect of synthesis parameters on structural and mechanical properties of Ti3Al-Nb-Mo intermetallic compound obtained by powder metallurgy techniques. in Transactions of Nonferrous Metals Society of China, 27(3), 527-537.
https://doi.org/10.1016/S1003-6326(17)60059-1

Dimčić B, Stašić J, Ružić J, Božić D. Effect of synthesis parameters on structural and mechanical properties of Ti3Al-Nb-Mo intermetallic compound obtained by powder metallurgy techniques. in Transactions of Nonferrous Metals Society of China. 2017;27(3):527-537.
doi:10.1016/S1003-6326(17)60059-1 .

Dimčić, Biljana, Stašić, Jelena, Ružić, Jovana, Božić, Dušan, "Effect of synthesis parameters on structural and mechanical properties of Ti3Al-Nb-Mo intermetallic compound obtained by powder metallurgy techniques" in Transactions of Nonferrous Metals Society of China, 27, no. 3 (2017):527-537,
https://doi.org/10.1016/S1003-6326(17)60059-1 . .

TY  - JOUR
AU  - Ružić, Jovana
AU  - Stašić, Jelena
AU  - Božić, Dušan
AU  - Dojčinović, Marina
AU  - Volkov-Husović, Tatjana
PY  - 2017
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/1942
AB  - Copper matrix composites reinforced with ZrB2 particles were produced in two ways: by hot pressing (HP) and laser-sintering process. Powder mixture Cu-Zr-B was mechanically alloyed before densification processes. Variations in the microstructure of treated samples obtained during cavitation test were analyzed by scanning electron microscopy (SEM). Cavitation erosion resistance was investigated with the standard test method for cavitation erosion using vibratory apparatus. Changes in mechanical alloying duration show a strong influence on cavitation erosion resistance of Cu-ZrB2 composites regardless the number of reinforcements. Laser-sintered samples show better cavitation erosion resistance than hot-pressed samples.
T2  - Metallurgical and Materials Engineering
T1  - Influence of the Fabrication Process of Copper Matrix Composites on Cavitation Erosion Resistance
VL  - 23
IS  - 4
SP  - 291
EP  - 301
DO  - 10.30544/244291
ER  - 

@article{
author = "Ružić, Jovana and Stašić, Jelena and Božić, Dušan and Dojčinović, Marina and Volkov-Husović, Tatjana",
year = "2017",
abstract = "Copper matrix composites reinforced with ZrB2 particles were produced in two ways: by hot pressing (HP) and laser-sintering process. Powder mixture Cu-Zr-B was mechanically alloyed before densification processes. Variations in the microstructure of treated samples obtained during cavitation test were analyzed by scanning electron microscopy (SEM). Cavitation erosion resistance was investigated with the standard test method for cavitation erosion using vibratory apparatus. Changes in mechanical alloying duration show a strong influence on cavitation erosion resistance of Cu-ZrB2 composites regardless the number of reinforcements. Laser-sintered samples show better cavitation erosion resistance than hot-pressed samples.",
journal = "Metallurgical and Materials Engineering",
title = "Influence of the Fabrication Process of Copper Matrix Composites on Cavitation Erosion Resistance",
volume = "23",
number = "4",
pages = "291-301",
doi = "10.30544/244291"
}

Ružić, J., Stašić, J., Božić, D., Dojčinović, M.,& Volkov-Husović, T.. (2017). Influence of the Fabrication Process of Copper Matrix Composites on Cavitation Erosion Resistance. in Metallurgical and Materials Engineering, 23(4), 291-301.
https://doi.org/10.30544/244291

Ružić J, Stašić J, Božić D, Dojčinović M, Volkov-Husović T. Influence of the Fabrication Process of Copper Matrix Composites on Cavitation Erosion Resistance. in Metallurgical and Materials Engineering. 2017;23(4):291-301.
doi:10.30544/244291 .

Ružić, Jovana, Stašić, Jelena, Božić, Dušan, Dojčinović, Marina, Volkov-Husović, Tatjana, "Influence of the Fabrication Process of Copper Matrix Composites on Cavitation Erosion Resistance" in Metallurgical and Materials Engineering, 23, no. 4 (2017):291-301,
https://doi.org/10.30544/244291 . .

TY  - JOUR
AU  - Božić, Dušan
AU  - Vilotijević, Miroljub N.
AU  - Ružić, Jovana
AU  - Jovanović, Uroš D.
AU  - Stašić, Jelena
PY  - 2016
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/1417
AB  - The present work demonstrates a procedure for synthesis of stainless steel powder by gravity sintering method. As an additive to the basic powder, NiB powder was added in the amount of 0.2 - 1.0 wt.%. Gravity sintering was done in vacuum, at the temperatures of 1100 degrees C - 1250 degrees C, in the course of 3 - 60 min, using ceramic mould. Structural characterization was conducted by XRD, and microstructural analysis by optical and scanning electron microscope (SEM). Mechanical properties were investigated by tensile tests with steel rings. Density and permeability were determined by standard techniques for porous samples. Gravity sintered stainless steel with NiB addition had more superior mechanical and physico-chemical properties compared to stainless steel obtained by standard powder metallurgy procedures - pressing and sintering.
T2  - Science of Sintering
T1  - Microstructure and Properties of Gravity Sintered 316L Stainless Steel Powder with Nickel boride Addition
VL  - 48
IS  - 3
SP  - 293
EP  - 302
DO  - 10.2298/SOS1603293B
ER  - 

@article{
author = "Božić, Dušan and Vilotijević, Miroljub N. and Ružić, Jovana and Jovanović, Uroš D. and Stašić, Jelena",
year = "2016",
abstract = "The present work demonstrates a procedure for synthesis of stainless steel powder by gravity sintering method. As an additive to the basic powder, NiB powder was added in the amount of 0.2 - 1.0 wt.%. Gravity sintering was done in vacuum, at the temperatures of 1100 degrees C - 1250 degrees C, in the course of 3 - 60 min, using ceramic mould. Structural characterization was conducted by XRD, and microstructural analysis by optical and scanning electron microscope (SEM). Mechanical properties were investigated by tensile tests with steel rings. Density and permeability were determined by standard techniques for porous samples. Gravity sintered stainless steel with NiB addition had more superior mechanical and physico-chemical properties compared to stainless steel obtained by standard powder metallurgy procedures - pressing and sintering.",
journal = "Science of Sintering",
title = "Microstructure and Properties of Gravity Sintered 316L Stainless Steel Powder with Nickel boride Addition",
volume = "48",
number = "3",
pages = "293-302",
doi = "10.2298/SOS1603293B"
}

Božić, D., Vilotijević, M. N., Ružić, J., Jovanović, U. D.,& Stašić, J.. (2016). Microstructure and Properties of Gravity Sintered 316L Stainless Steel Powder with Nickel boride Addition. in Science of Sintering, 48(3), 293-302.
https://doi.org/10.2298/SOS1603293B

Božić D, Vilotijević MN, Ružić J, Jovanović UD, Stašić J. Microstructure and Properties of Gravity Sintered 316L Stainless Steel Powder with Nickel boride Addition. in Science of Sintering. 2016;48(3):293-302.
doi:10.2298/SOS1603293B .

Božić, Dušan, Vilotijević, Miroljub N., Ružić, Jovana, Jovanović, Uroš D., Stašić, Jelena, "Microstructure and Properties of Gravity Sintered 316L Stainless Steel Powder with Nickel boride Addition" in Science of Sintering, 48, no. 3 (2016):293-302,
https://doi.org/10.2298/SOS1603293B . .

TY  - JOUR
AU  - Stašić, Jelena
AU  - Božić, Dušan
PY  - 2016
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/1348
AB  - Stainless steel (316L) powder and mixed 316L-lwt.%NiB powders were melted by laser irradiation. Laser employed was pulsed, millisecond Nd:YAG laser system. The relationship between major process variables - average laser power, laser scan speed, number of spots, pulse energy, pulse duration, pulse frequency - of selective laser melting, and their effect on the structure of single tracks and single layers in case of 316L and 316L-NiB alloys has been investigated. The morphology, macro- and microstructure of laser melted samples were characterized by digital camera and by scanning electron microscope with an energy dispersive X-ray spectrometer. Surface roughness of the layers was measured using optical profilometer. It was determined that the addition of NiB to 316L stainless steel powder provides much better surface quality and wider set of parameters for successful melting. (C) 2016 Elsevier B.V. All rights reserved.
T2  - Surface and Coatings Technology
T1  - The effect of NiB additive on surface morphology and microstructure of 316L stainless steel single tracks and layers obtained by SLM
VL  - 307
SP  - 407
EP  - 417
DO  - 10.1016/j.surfcoat.2016.09.019
ER  - 

@article{
author = "Stašić, Jelena and Božić, Dušan",
year = "2016",
abstract = "Stainless steel (316L) powder and mixed 316L-lwt.%NiB powders were melted by laser irradiation. Laser employed was pulsed, millisecond Nd:YAG laser system. The relationship between major process variables - average laser power, laser scan speed, number of spots, pulse energy, pulse duration, pulse frequency - of selective laser melting, and their effect on the structure of single tracks and single layers in case of 316L and 316L-NiB alloys has been investigated. The morphology, macro- and microstructure of laser melted samples were characterized by digital camera and by scanning electron microscope with an energy dispersive X-ray spectrometer. Surface roughness of the layers was measured using optical profilometer. It was determined that the addition of NiB to 316L stainless steel powder provides much better surface quality and wider set of parameters for successful melting. (C) 2016 Elsevier B.V. All rights reserved.",
journal = "Surface and Coatings Technology",
title = "The effect of NiB additive on surface morphology and microstructure of 316L stainless steel single tracks and layers obtained by SLM",
volume = "307",
pages = "407-417",
doi = "10.1016/j.surfcoat.2016.09.019"
}

Stašić, J.,& Božić, D.. (2016). The effect of NiB additive on surface morphology and microstructure of 316L stainless steel single tracks and layers obtained by SLM. in Surface and Coatings Technology, 307, 407-417.
https://doi.org/10.1016/j.surfcoat.2016.09.019

Stašić J, Božić D. The effect of NiB additive on surface morphology and microstructure of 316L stainless steel single tracks and layers obtained by SLM. in Surface and Coatings Technology. 2016;307:407-417.
doi:10.1016/j.surfcoat.2016.09.019 .

Stašić, Jelena, Božić, Dušan, "The effect of NiB additive on surface morphology and microstructure of 316L stainless steel single tracks and layers obtained by SLM" in Surface and Coatings Technology, 307 (2016):407-417,
https://doi.org/10.1016/j.surfcoat.2016.09.019 . .

TY  - JOUR
AU  - Stašić, Jelena
AU  - Rajković, Višeslava M.
AU  - Ružić, Jovana
AU  - Božić, Dušan
PY  - 2015
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/720
AB  - Cold pressed mechanically alloyed Cu-1Zr (wt%) and Cu-4.1Zr-1.1B (wt%) powders were sintered by laser irradiation. Laser employed was pulsed, millisecond Nd:YAG laser system. The influence of different sintering parameters on structural, mechanical, and physical properties of laser-sintered materials was investigated. Microstructural changes during laser sintering were studied using scanning electron microscopy and X-ray diffraction. High hardening of the Cu-Zr alloy is achieved by thermal treatment due to the influence of the developed rapidly solidified structure and precipitation of metastable CuZr. In ternary Cu-Zr-B alloy rapidly solidified structure, as well as the presence of ZrB2 particles and metastable CuZr phase, affected much higher degree of copper matrix hardening which, thanks to the ceramic particles, is retained at high temperatures. It was determined that the optimum combination of high density, microhardness, and electrical conductivity is reached using the following parameters: laser frequency 3 Hz, laser pulse duration 8 ms, pulse energy similar to 19 J, number of scans 3 (binary alloy), i.e., 4 (ternary alloy).
T2  - International Journal of Advanced Manufacturing Technology
T1  - An investigation on synthesis development of high hardened, high conductivity Cu-Zr and Cu-Zr-ZrB2 alloys through green compact laser sintering
VL  - 80
IS  - 5-8
SP  - 1049
EP  - 1057
DO  - 10.1007/s00170-015-7098-y
ER  - 

@article{
author = "Stašić, Jelena and Rajković, Višeslava M. and Ružić, Jovana and Božić, Dušan",
year = "2015",
abstract = "Cold pressed mechanically alloyed Cu-1Zr (wt%) and Cu-4.1Zr-1.1B (wt%) powders were sintered by laser irradiation. Laser employed was pulsed, millisecond Nd:YAG laser system. The influence of different sintering parameters on structural, mechanical, and physical properties of laser-sintered materials was investigated. Microstructural changes during laser sintering were studied using scanning electron microscopy and X-ray diffraction. High hardening of the Cu-Zr alloy is achieved by thermal treatment due to the influence of the developed rapidly solidified structure and precipitation of metastable CuZr. In ternary Cu-Zr-B alloy rapidly solidified structure, as well as the presence of ZrB2 particles and metastable CuZr phase, affected much higher degree of copper matrix hardening which, thanks to the ceramic particles, is retained at high temperatures. It was determined that the optimum combination of high density, microhardness, and electrical conductivity is reached using the following parameters: laser frequency 3 Hz, laser pulse duration 8 ms, pulse energy similar to 19 J, number of scans 3 (binary alloy), i.e., 4 (ternary alloy).",
journal = "International Journal of Advanced Manufacturing Technology",
title = "An investigation on synthesis development of high hardened, high conductivity Cu-Zr and Cu-Zr-ZrB2 alloys through green compact laser sintering",
volume = "80",
number = "5-8",
pages = "1049-1057",
doi = "10.1007/s00170-015-7098-y"
}

Stašić, J., Rajković, V. M., Ružić, J.,& Božić, D.. (2015). An investigation on synthesis development of high hardened, high conductivity Cu-Zr and Cu-Zr-ZrB2 alloys through green compact laser sintering. in International Journal of Advanced Manufacturing Technology, 80(5-8), 1049-1057.
https://doi.org/10.1007/s00170-015-7098-y

Stašić J, Rajković VM, Ružić J, Božić D. An investigation on synthesis development of high hardened, high conductivity Cu-Zr and Cu-Zr-ZrB2 alloys through green compact laser sintering. in International Journal of Advanced Manufacturing Technology. 2015;80(5-8):1049-1057.
doi:10.1007/s00170-015-7098-y .

Stašić, Jelena, Rajković, Višeslava M., Ružić, Jovana, Božić, Dušan, "An investigation on synthesis development of high hardened, high conductivity Cu-Zr and Cu-Zr-ZrB2 alloys through green compact laser sintering" in International Journal of Advanced Manufacturing Technology, 80, no. 5-8 (2015):1049-1057,
https://doi.org/10.1007/s00170-015-7098-y . .

TY  - JOUR
AU  - Ružić, Jovana
AU  - Stašić, Jelena
AU  - Rajković, Višeslava M.
AU  - Raic, Karlo
AU  - Božić, Dušan
PY  - 2015
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/792
AB  - The Cu-7vol.%ZrB2 alloy examined in this study was consolidated via powder metallurgy (PM) processing by combining mechanical alloying and hot pressing. Powder mixture with composition: 94.78 wt.% copper, 4.1 wt.% zirconium, and 1.12 wt.% boron was used as a starting material. Mechanical alloying of powder mixture was performed at various times: 5, 10, 15, 20, 25, and 30 h. Structural changes that occur in the samples of copper alloy with 7vol.%ZrB2 after milling and during hot pressing process were studied with the use of X-ray diffraction. Scanning electron microscopy (SEM) equipped with an energy dispersive X-ray spectrometry (EDS) was applied to examine the morphological properties and elemental analysis of the hot-pressed samples as a function of milling times. Also, hardness of the Cu-7vol.%ZrB2 alloy was investigated, and the results showed that hardness of the samples increased as the milling time increased. The compressive properties at room temperature are correlated to the corresponding hardness results. Distribution of ZrB2 particles and presence of agglomerates in the Cu matrix directly depend on the milling time and show strong influence on compressive properties and fracture of Cu7vol.%ZrB2 alloy.
T2  - Science and Engineering of Composite Materials
T1  - Microstructural and mechanical properties of Cu-7vol.%ZrB2 alloy produced by powder metallurgy techniques
VL  - 22
IS  - 6
SP  - 665
EP  - 671
DO  - 10.1515/secm-2013-0178
ER  - 

@article{
author = "Ružić, Jovana and Stašić, Jelena and Rajković, Višeslava M. and Raic, Karlo and Božić, Dušan",
year = "2015",
abstract = "The Cu-7vol.%ZrB2 alloy examined in this study was consolidated via powder metallurgy (PM) processing by combining mechanical alloying and hot pressing. Powder mixture with composition: 94.78 wt.% copper, 4.1 wt.% zirconium, and 1.12 wt.% boron was used as a starting material. Mechanical alloying of powder mixture was performed at various times: 5, 10, 15, 20, 25, and 30 h. Structural changes that occur in the samples of copper alloy with 7vol.%ZrB2 after milling and during hot pressing process were studied with the use of X-ray diffraction. Scanning electron microscopy (SEM) equipped with an energy dispersive X-ray spectrometry (EDS) was applied to examine the morphological properties and elemental analysis of the hot-pressed samples as a function of milling times. Also, hardness of the Cu-7vol.%ZrB2 alloy was investigated, and the results showed that hardness of the samples increased as the milling time increased. The compressive properties at room temperature are correlated to the corresponding hardness results. Distribution of ZrB2 particles and presence of agglomerates in the Cu matrix directly depend on the milling time and show strong influence on compressive properties and fracture of Cu7vol.%ZrB2 alloy.",
journal = "Science and Engineering of Composite Materials",
title = "Microstructural and mechanical properties of Cu-7vol.%ZrB2 alloy produced by powder metallurgy techniques",
volume = "22",
number = "6",
pages = "665-671",
doi = "10.1515/secm-2013-0178"
}

Ružić, J., Stašić, J., Rajković, V. M., Raic, K.,& Božić, D.. (2015). Microstructural and mechanical properties of Cu-7vol.%ZrB2 alloy produced by powder metallurgy techniques. in Science and Engineering of Composite Materials, 22(6), 665-671.
https://doi.org/10.1515/secm-2013-0178

Ružić J, Stašić J, Rajković VM, Raic K, Božić D. Microstructural and mechanical properties of Cu-7vol.%ZrB2 alloy produced by powder metallurgy techniques. in Science and Engineering of Composite Materials. 2015;22(6):665-671.
doi:10.1515/secm-2013-0178 .

Ružić, Jovana, Stašić, Jelena, Rajković, Višeslava M., Raic, Karlo, Božić, Dušan, "Microstructural and mechanical properties of Cu-7vol.%ZrB2 alloy produced by powder metallurgy techniques" in Science and Engineering of Composite Materials, 22, no. 6 (2015):665-671,
https://doi.org/10.1515/secm-2013-0178 . .

TY  - JOUR
AU  - Stašić, Jelena
AU  - Trtica, Milan
AU  - Rajković, Višeslava M.
AU  - Ružić, Jovana
AU  - Božić, Dušan
PY  - 2014
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/58
AB  - Cu-4.1Zr-1.1B (wt%) composite has been synthesized by mechanical alloying, cold pressing of mechanically alloyed powders and, for the first time in literature, sintering by laser irradiation (pulsed, millisecond Nd: YAG laser was employed) in nitrogen atmosphere. The influence of different sintering parameters on the properties of laser-sintered materials was investigated. Microstructural changes during laser sintering were studied using scanning electron microscopy and X-ray diffraction. Rapidly solidified structure, as well as the presence of ZrB2 particles and metastable CuZr phase, which are a product of laser sintering, affected higher degree of copper matrix hardening which was retained up to high temperatures. In general, laser sintering of Cu-4.1Zr-1.1B (wt%) green compact using the parameters: laser frequency 3 Hz, laser pulse duration 8 ms, pulse energy similar to 19 J, number of scans 4 yields the optimum combination of high density, microhardness and electrical conductivity. (C) 2014 Elsevier B.V. All rights reserved.
T2  - Applied Surface Science
T1  - Laser sintering of Cu-Zr-ZrB2 composite
VL  - 321
SP  - 353
EP  - 357
DO  - 10.1016/j.apsusc.2014.10.021
ER  - 

@article{
author = "Stašić, Jelena and Trtica, Milan and Rajković, Višeslava M. and Ružić, Jovana and Božić, Dušan",
year = "2014",
abstract = "Cu-4.1Zr-1.1B (wt%) composite has been synthesized by mechanical alloying, cold pressing of mechanically alloyed powders and, for the first time in literature, sintering by laser irradiation (pulsed, millisecond Nd: YAG laser was employed) in nitrogen atmosphere. The influence of different sintering parameters on the properties of laser-sintered materials was investigated. Microstructural changes during laser sintering were studied using scanning electron microscopy and X-ray diffraction. Rapidly solidified structure, as well as the presence of ZrB2 particles and metastable CuZr phase, which are a product of laser sintering, affected higher degree of copper matrix hardening which was retained up to high temperatures. In general, laser sintering of Cu-4.1Zr-1.1B (wt%) green compact using the parameters: laser frequency 3 Hz, laser pulse duration 8 ms, pulse energy similar to 19 J, number of scans 4 yields the optimum combination of high density, microhardness and electrical conductivity. (C) 2014 Elsevier B.V. All rights reserved.",
journal = "Applied Surface Science",
title = "Laser sintering of Cu-Zr-ZrB2 composite",
volume = "321",
pages = "353-357",
doi = "10.1016/j.apsusc.2014.10.021"
}

Stašić, J., Trtica, M., Rajković, V. M., Ružić, J.,& Božić, D.. (2014). Laser sintering of Cu-Zr-ZrB2 composite. in Applied Surface Science, 321, 353-357.
https://doi.org/10.1016/j.apsusc.2014.10.021

Stašić J, Trtica M, Rajković VM, Ružić J, Božić D. Laser sintering of Cu-Zr-ZrB2 composite. in Applied Surface Science. 2014;321:353-357.
doi:10.1016/j.apsusc.2014.10.021 .

Stašić, Jelena, Trtica, Milan, Rajković, Višeslava M., Ružić, Jovana, Božić, Dušan, "Laser sintering of Cu-Zr-ZrB2 composite" in Applied Surface Science, 321 (2014):353-357,
https://doi.org/10.1016/j.apsusc.2014.10.021 . .

TY  - JOUR
AU  - Ružić, Jovana
AU  - Stašić, Jelena
AU  - Marković, Smilja
AU  - Raic, K.
AU  - Božić, Dušan
PY  - 2014
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/163
AB  - The copper alloy with 7vol.% ZrB2 examined in this study was consolidated via powder metallurgy processing (PM) by combining mechanical alloying and hot pressing process. Structural changes, morphological properties and elemental analysis of the hot-pressed samples were studied as a function of milling time with the use of X-ray diffraction, scanning electron microscopy (SEM) equipped with an energy dispersive X-ray spectrometry (EDS). Also, mechanical properties of the Cu-7vol.%ZrB2 alloy was investigated. Distribution of ZrB2 particles and presence of agglomerates in the Cu matrix directly depend on the milling time and show strong influence on hardness, compressive and electrical properties of Cu-ZrB2 alloys.
T2  - Science of Sintering
T1  - Synthesis and Characterization of Cu-ZrB2 Alloy Produced by PM Techniques
VL  - 46
IS  - 2
SP  - 217
EP  - 224
DO  - 10.2298/SOS1402217R
ER  - 

@article{
author = "Ružić, Jovana and Stašić, Jelena and Marković, Smilja and Raic, K. and Božić, Dušan",
year = "2014",
abstract = "The copper alloy with 7vol.% ZrB2 examined in this study was consolidated via powder metallurgy processing (PM) by combining mechanical alloying and hot pressing process. Structural changes, morphological properties and elemental analysis of the hot-pressed samples were studied as a function of milling time with the use of X-ray diffraction, scanning electron microscopy (SEM) equipped with an energy dispersive X-ray spectrometry (EDS). Also, mechanical properties of the Cu-7vol.%ZrB2 alloy was investigated. Distribution of ZrB2 particles and presence of agglomerates in the Cu matrix directly depend on the milling time and show strong influence on hardness, compressive and electrical properties of Cu-ZrB2 alloys.",
journal = "Science of Sintering",
title = "Synthesis and Characterization of Cu-ZrB2 Alloy Produced by PM Techniques",
volume = "46",
number = "2",
pages = "217-224",
doi = "10.2298/SOS1402217R"
}

Ružić, J., Stašić, J., Marković, S., Raic, K.,& Božić, D.. (2014). Synthesis and Characterization of Cu-ZrB2 Alloy Produced by PM Techniques. in Science of Sintering, 46(2), 217-224.
https://doi.org/10.2298/SOS1402217R

Ružić J, Stašić J, Marković S, Raic K, Božić D. Synthesis and Characterization of Cu-ZrB2 Alloy Produced by PM Techniques. in Science of Sintering. 2014;46(2):217-224.
doi:10.2298/SOS1402217R .

Ružić, Jovana, Stašić, Jelena, Marković, Smilja, Raic, K., Božić, Dušan, "Synthesis and Characterization of Cu-ZrB2 Alloy Produced by PM Techniques" in Science of Sintering, 46, no. 2 (2014):217-224,
https://doi.org/10.2298/SOS1402217R . .

TY  - JOUR
AU  - Božić, Dušan
AU  - Ružić, Jovana
AU  - Stašić, Jelena
AU  - Rajković, Višeslava M.
PY  - 2014
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/5886
AB  - The hardening of copper alloy by using powder metallurgy techniques and analysis of its effects on the strength of obtained material are discussed. Prealloyed Cu-0.5 wt.% Cr powder and mechanically alloyed Cu-0.5 wt.% Cr-3 wt.% Al2O3 powder were consolidated by means of hot pressing. Optical microscopy, scanning electron microscopy and transmission electron microscopy were used for microstructure characterization of compacts. Hardness and electrical conductivity of both compacts were compared. High strengthening of the Cu-Cr compacts is achieved by aging as a consequence of the influence of precipitation particles rich in chromium. In the case of the Cu-Cr-Al2O3 composite it is a consequence of precipitation of particles rich in chromium and the presence of Al2O3 dispersoid nanopartidies.
T2  - International Journal of Materials Research
T1  - Synthesis and characteristics of precipitation hardened Cu-Cr alloy and multiply hardened Cu-Cr-Al2O3 nanocomposite obtained using powder metallurgy techniques
VL  - 105
IS  - 2
SP  - 194
EP  - 199
DO  - 10.3139/146.111000
ER  - 

@article{
author = "Božić, Dušan and Ružić, Jovana and Stašić, Jelena and Rajković, Višeslava M.",
year = "2014",
abstract = "The hardening of copper alloy by using powder metallurgy techniques and analysis of its effects on the strength of obtained material are discussed. Prealloyed Cu-0.5 wt.% Cr powder and mechanically alloyed Cu-0.5 wt.% Cr-3 wt.% Al2O3 powder were consolidated by means of hot pressing. Optical microscopy, scanning electron microscopy and transmission electron microscopy were used for microstructure characterization of compacts. Hardness and electrical conductivity of both compacts were compared. High strengthening of the Cu-Cr compacts is achieved by aging as a consequence of the influence of precipitation particles rich in chromium. In the case of the Cu-Cr-Al2O3 composite it is a consequence of precipitation of particles rich in chromium and the presence of Al2O3 dispersoid nanopartidies.",
journal = "International Journal of Materials Research",
title = "Synthesis and characteristics of precipitation hardened Cu-Cr alloy and multiply hardened Cu-Cr-Al2O3 nanocomposite obtained using powder metallurgy techniques",
volume = "105",
number = "2",
pages = "194-199",
doi = "10.3139/146.111000"
}

Božić, D., Ružić, J., Stašić, J.,& Rajković, V. M.. (2014). Synthesis and characteristics of precipitation hardened Cu-Cr alloy and multiply hardened Cu-Cr-Al2O3 nanocomposite obtained using powder metallurgy techniques. in International Journal of Materials Research, 105(2), 194-199.
https://doi.org/10.3139/146.111000

Božić D, Ružić J, Stašić J, Rajković VM. Synthesis and characteristics of precipitation hardened Cu-Cr alloy and multiply hardened Cu-Cr-Al2O3 nanocomposite obtained using powder metallurgy techniques. in International Journal of Materials Research. 2014;105(2):194-199.
doi:10.3139/146.111000 .

Božić, Dušan, Ružić, Jovana, Stašić, Jelena, Rajković, Višeslava M., "Synthesis and characteristics of precipitation hardened Cu-Cr alloy and multiply hardened Cu-Cr-Al2O3 nanocomposite obtained using powder metallurgy techniques" in International Journal of Materials Research, 105, no. 2 (2014):194-199,
https://doi.org/10.3139/146.111000 . .

TY  - JOUR
AU  - Ružić, Jovana
AU  - Stašić, Jelena
AU  - Rajković, Višeslava M.
AU  - Božić, Dušan
PY  - 2014
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/6099
AB  - Copper matrix composite reinforced with ZrB2 particles was prepared by in situ reaction in two different ways: by mechanical alloying and subsequent hot pressing, i.e. mechanical alloying and followed by laser melting process. Microstructural changes during mechanical alloying, hot pressing and laser melting of Cu, Zr and B powder mixtures were studied using scanning electron microscopy and X-ray diffraction. In particular, changes in the Cu particle size, structural parameters of the powder mixtures and formation of new ZrB2 and CuZr phases during hot pressing, i.e. laser melting were investigated. The mechanisms of in situ formation of reinforcement particles and hardening effects in the copper composite were also studied. Large supersaturation which is possible with laser melting process results in homogeneous nucleation of CuZr precipitates and the presence of finer CuZr precipitates and ZrB2 reinforcements in the Cu matrix. This affected on significantly higher degree of Cu matrix hardening compared to composites obtained by mechanical alloying and hot pressing. (C) 2014 Elsevier Ltd. All rights reserved.
T2  - Materials and Design
T1  - Synthesis, microstructure and mechanical properties of ZrB2 nano and microparticle reinforced copper matrix composite by in situ processings
VL  - 62
SP  - 409
EP  - 415
DO  - 10.1016/j.matdes.2014.05.036
ER  - 

@article{
author = "Ružić, Jovana and Stašić, Jelena and Rajković, Višeslava M. and Božić, Dušan",
year = "2014",
abstract = "Copper matrix composite reinforced with ZrB2 particles was prepared by in situ reaction in two different ways: by mechanical alloying and subsequent hot pressing, i.e. mechanical alloying and followed by laser melting process. Microstructural changes during mechanical alloying, hot pressing and laser melting of Cu, Zr and B powder mixtures were studied using scanning electron microscopy and X-ray diffraction. In particular, changes in the Cu particle size, structural parameters of the powder mixtures and formation of new ZrB2 and CuZr phases during hot pressing, i.e. laser melting were investigated. The mechanisms of in situ formation of reinforcement particles and hardening effects in the copper composite were also studied. Large supersaturation which is possible with laser melting process results in homogeneous nucleation of CuZr precipitates and the presence of finer CuZr precipitates and ZrB2 reinforcements in the Cu matrix. This affected on significantly higher degree of Cu matrix hardening compared to composites obtained by mechanical alloying and hot pressing. (C) 2014 Elsevier Ltd. All rights reserved.",
journal = "Materials and Design",
title = "Synthesis, microstructure and mechanical properties of ZrB2 nano and microparticle reinforced copper matrix composite by in situ processings",
volume = "62",
pages = "409-415",
doi = "10.1016/j.matdes.2014.05.036"
}

Ružić, J., Stašić, J., Rajković, V. M.,& Božić, D.. (2014). Synthesis, microstructure and mechanical properties of ZrB2 nano and microparticle reinforced copper matrix composite by in situ processings. in Materials and Design, 62, 409-415.
https://doi.org/10.1016/j.matdes.2014.05.036

Ružić J, Stašić J, Rajković VM, Božić D. Synthesis, microstructure and mechanical properties of ZrB2 nano and microparticle reinforced copper matrix composite by in situ processings. in Materials and Design. 2014;62:409-415.
doi:10.1016/j.matdes.2014.05.036 .

Ružić, Jovana, Stašić, Jelena, Rajković, Višeslava M., Božić, Dušan, "Synthesis, microstructure and mechanical properties of ZrB2 nano and microparticle reinforced copper matrix composite by in situ processings" in Materials and Design, 62 (2014):409-415,
https://doi.org/10.1016/j.matdes.2014.05.036 . .

TY  - CONF
AU  - Rajković, Višeslava M.
AU  - Božić, Dušan
AU  - Stašić, Jelena
AU  - Jovanović, Milan T.
AU  - Wang, Huaiwen
PY  - 2014
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/7033
AB  - Copper matrix was simultaneously reinforced with nano- and micro-sized Al2O3 particles via high-energy milling of the mixture of inert gas-atomized prealloyed Cu-1 wt.% Al powder and 0.6 wt.% commercial Al2O3 powder. At the maximum of microhardness (2400 MPa) the grain size reaches the smallest value as a result of the synergetic effect of nano- and micro-sized Al2O3 particles. The relatively low decrease in microhardness during HTE may be explained by grain growth which is retarded by Al2O3 nano-sized particles precipitated at the grain boundaries.
T1  - Properties of Copper-Based Composite Reinforced with Al2O3 Particles of Different Size
VL  - 875-877
SP  - 318
EP  - +
DO  - 10.4028/www.scientific.net/AMR.875-877.318
ER  - 

@conference{
author = "Rajković, Višeslava M. and Božić, Dušan and Stašić, Jelena and Jovanović, Milan T. and Wang, Huaiwen",
year = "2014",
abstract = "Copper matrix was simultaneously reinforced with nano- and micro-sized Al2O3 particles via high-energy milling of the mixture of inert gas-atomized prealloyed Cu-1 wt.% Al powder and 0.6 wt.% commercial Al2O3 powder. At the maximum of microhardness (2400 MPa) the grain size reaches the smallest value as a result of the synergetic effect of nano- and micro-sized Al2O3 particles. The relatively low decrease in microhardness during HTE may be explained by grain growth which is retarded by Al2O3 nano-sized particles precipitated at the grain boundaries.",
title = "Properties of Copper-Based Composite Reinforced with Al2O3 Particles of Different Size",
volume = "875-877",
pages = "318-+",
doi = "10.4028/www.scientific.net/AMR.875-877.318"
}

Rajković, V. M., Božić, D., Stašić, J., Jovanović, M. T.,& Wang, H.. (2014). Properties of Copper-Based Composite Reinforced with Al2O3 Particles of Different Size. , 875-877, 318-+.
https://doi.org/10.4028/www.scientific.net/AMR.875-877.318

Rajković VM, Božić D, Stašić J, Jovanović MT, Wang H. Properties of Copper-Based Composite Reinforced with Al2O3 Particles of Different Size. 2014;875-877:318-+.
doi:10.4028/www.scientific.net/AMR.875-877.318 .

Rajković, Višeslava M., Božić, Dušan, Stašić, Jelena, Jovanović, Milan T., Wang, Huaiwen, "Properties of Copper-Based Composite Reinforced with Al2O3 Particles of Different Size", 875-877 (2014):318-+,
https://doi.org/10.4028/www.scientific.net/AMR.875-877.318 . .

TY  - JOUR
AU  - Rajković, Višeslava M.
AU  - Božić, Dušan
AU  - Stašić, Jelena
AU  - Wang, Huaiwen
AU  - Jovanović, Milan T.
PY  - 2014
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/176
AB  - Copper-based composites strengthened by nano- and micro-sized alumina particles were fabricated by internal oxidation and mechanical alloying followed by hot-pressing. The effect of the simultaneous presence of nano- and micro-sized alumina particles on the microstructure and properties of the copper matrix was the object of this study. The inert gas-atomised prealloyed copper powder containing 0.5 wt.% Al and the mixture of inert gas-atomized prealloyed copper powder with 0.6 wt.% micro-sized alumina powder served as starting materials. Microstructure of composites was studied by X-ray diffraction analysis, scanning (SEM) and transmission electron microscopy (TEM). Microhardness, density and electrical conductivity were also applied for determination of properties. Microstructural characterization showed that nano-sized alumina particles significantly lower the grain size and inhibit the grain growth. Considerable increase of microhardness was also detected. At the maximum values (after 10 h of milling) the microhardness of both composites, Cu-0.5 wt.% Al and hybrid Cu-0.5 wt% Al + 0.6 wt.% Al2O3, was approximately 3 times higher than microhardness of non-milled compacts processed from prealloyed copper and electrolytic copper powders. Micro-sized alumina particles play a twofold role in the strengthening of the copper matrix of the hybrid composite: together with the nano-sized particles they strengthen the matrix at shorter milling time, but with prolonged milling time the dislocation substructure formed around coarse particles serves as a trigger for the start of recrystallization processes provoking a decrease of microhardness. Both composites exhibit a much higher thermal stability at 800 degrees C than copper alloy processed by the method of vacuum melting and casting. The contribution of individual mechanisms such as the grain size, thermal expansion mismatch and Orowan hardening in strengthening of composites was evaluated and correlated with experimental-results. (C) 2014 Elsevier B.V. All rights reserved.
T2  - Powder Technology
T1  - Processing, characterization and properties of copper-based composites strengthened by low amount of alumina particles
VL  - 268
SP  - 392
EP  - 400
DO  - 10.1016/j.powtec.2014.08.051
ER  - 

@article{
author = "Rajković, Višeslava M. and Božić, Dušan and Stašić, Jelena and Wang, Huaiwen and Jovanović, Milan T.",
year = "2014",
abstract = "Copper-based composites strengthened by nano- and micro-sized alumina particles were fabricated by internal oxidation and mechanical alloying followed by hot-pressing. The effect of the simultaneous presence of nano- and micro-sized alumina particles on the microstructure and properties of the copper matrix was the object of this study. The inert gas-atomised prealloyed copper powder containing 0.5 wt.% Al and the mixture of inert gas-atomized prealloyed copper powder with 0.6 wt.% micro-sized alumina powder served as starting materials. Microstructure of composites was studied by X-ray diffraction analysis, scanning (SEM) and transmission electron microscopy (TEM). Microhardness, density and electrical conductivity were also applied for determination of properties. Microstructural characterization showed that nano-sized alumina particles significantly lower the grain size and inhibit the grain growth. Considerable increase of microhardness was also detected. At the maximum values (after 10 h of milling) the microhardness of both composites, Cu-0.5 wt.% Al and hybrid Cu-0.5 wt% Al + 0.6 wt.% Al2O3, was approximately 3 times higher than microhardness of non-milled compacts processed from prealloyed copper and electrolytic copper powders. Micro-sized alumina particles play a twofold role in the strengthening of the copper matrix of the hybrid composite: together with the nano-sized particles they strengthen the matrix at shorter milling time, but with prolonged milling time the dislocation substructure formed around coarse particles serves as a trigger for the start of recrystallization processes provoking a decrease of microhardness. Both composites exhibit a much higher thermal stability at 800 degrees C than copper alloy processed by the method of vacuum melting and casting. The contribution of individual mechanisms such as the grain size, thermal expansion mismatch and Orowan hardening in strengthening of composites was evaluated and correlated with experimental-results. (C) 2014 Elsevier B.V. All rights reserved.",
journal = "Powder Technology",
title = "Processing, characterization and properties of copper-based composites strengthened by low amount of alumina particles",
volume = "268",
pages = "392-400",
doi = "10.1016/j.powtec.2014.08.051"
}

Rajković, V. M., Božić, D., Stašić, J., Wang, H.,& Jovanović, M. T.. (2014). Processing, characterization and properties of copper-based composites strengthened by low amount of alumina particles. in Powder Technology, 268, 392-400.
https://doi.org/10.1016/j.powtec.2014.08.051

Rajković VM, Božić D, Stašić J, Wang H, Jovanović MT. Processing, characterization and properties of copper-based composites strengthened by low amount of alumina particles. in Powder Technology. 2014;268:392-400.
doi:10.1016/j.powtec.2014.08.051 .

Rajković, Višeslava M., Božić, Dušan, Stašić, Jelena, Wang, Huaiwen, Jovanović, Milan T., "Processing, characterization and properties of copper-based composites strengthened by low amount of alumina particles" in Powder Technology, 268 (2014):392-400,
https://doi.org/10.1016/j.powtec.2014.08.051 . .