TY  - JOUR
AU  - Laketić, Slađana
AU  - Rakin, Marko
AU  - Momčilović, Miloš
AU  - Ciganović, Jovan
AU  - Veljović, Đorđe N.
AU  - Cvijović-Alagić, Ivana
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9735
AB  - The effects of picosecond Nd:YAG laser irradiation on chemical and morphological surface characteristics of the commercially pure titanium and Ti-13Nb-13Zr alloy in air and argon atmospheres were studied under different laser output energy values. During the interaction of laser irradiation with the investigated materials, a part of the energy was absorbed on the target surface, influencing surface modifications. Laser beam interaction with the target surface resulted in various morphological alterations, resulting in crater formation and the presence of microcracks and hydrodynamic structures. Moreover, different chemical changes were induced on the target materials' surfaces, resulting in the titanium oxide formation in the irradiation-affected area and consequently increasing the irradiation energy absorption. Given the high energy absorption at the site of interaction, the dimensions of the surface damaged area increased. Consequently, surface roughness increased. The appearance of surface oxides also led to the increased material hardness in the surface-modified area. Observed chemical and morphological changes were pronounced after laser irradiation of the Ti-13Nb-13Zr alloy surface.
PB  - Springer, New York
T2  - International Journal of Minerals Metallurgy and Materials
T1  - Surface modifications of biometallic commercially pure Ti and Ti-13Nb-13Zr alloy by picosecond Nd:YAG laser
DO  - 10.1007/s12613-020-2061-9
ER  - 

@article{
author = "Laketić, Slađana and Rakin, Marko and Momčilović, Miloš and Ciganović, Jovan and Veljović, Đorđe N. and Cvijović-Alagić, Ivana",
year = "2021",
abstract = "The effects of picosecond Nd:YAG laser irradiation on chemical and morphological surface characteristics of the commercially pure titanium and Ti-13Nb-13Zr alloy in air and argon atmospheres were studied under different laser output energy values. During the interaction of laser irradiation with the investigated materials, a part of the energy was absorbed on the target surface, influencing surface modifications. Laser beam interaction with the target surface resulted in various morphological alterations, resulting in crater formation and the presence of microcracks and hydrodynamic structures. Moreover, different chemical changes were induced on the target materials' surfaces, resulting in the titanium oxide formation in the irradiation-affected area and consequently increasing the irradiation energy absorption. Given the high energy absorption at the site of interaction, the dimensions of the surface damaged area increased. Consequently, surface roughness increased. The appearance of surface oxides also led to the increased material hardness in the surface-modified area. Observed chemical and morphological changes were pronounced after laser irradiation of the Ti-13Nb-13Zr alloy surface.",
publisher = "Springer, New York",
journal = "International Journal of Minerals Metallurgy and Materials",
title = "Surface modifications of biometallic commercially pure Ti and Ti-13Nb-13Zr alloy by picosecond Nd:YAG laser",
doi = "10.1007/s12613-020-2061-9"
}

Laketić, S., Rakin, M., Momčilović, M., Ciganović, J., Veljović, Đ. N.,& Cvijović-Alagić, I.. (2021). Surface modifications of biometallic commercially pure Ti and Ti-13Nb-13Zr alloy by picosecond Nd:YAG laser. in International Journal of Minerals Metallurgy and Materials
Springer, New York..
https://doi.org/10.1007/s12613-020-2061-9

Laketić S, Rakin M, Momčilović M, Ciganović J, Veljović ĐN, Cvijović-Alagić I. Surface modifications of biometallic commercially pure Ti and Ti-13Nb-13Zr alloy by picosecond Nd:YAG laser. in International Journal of Minerals Metallurgy and Materials. 2021;.
doi:10.1007/s12613-020-2061-9 .

Laketić, Slađana, Rakin, Marko, Momčilović, Miloš, Ciganović, Jovan, Veljović, Đorđe N., Cvijović-Alagić, Ivana, "Surface modifications of biometallic commercially pure Ti and Ti-13Nb-13Zr alloy by picosecond Nd:YAG laser" in International Journal of Minerals Metallurgy and Materials (2021),
https://doi.org/10.1007/s12613-020-2061-9 . .

TY  - JOUR
AU  - Laketić, Slađana
AU  - Rakin, Marko
AU  - Momčilović, Miloš
AU  - Ciganović, Jovan
AU  - Veljović, Đorđe N.
AU  - Cvijović-Alagić, Ivana
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9747
AB  - In the present study surface alterations of the high pressure torsion (HPT)-deformed Ti[sbnd]45Nb (mass%) alloy induced by laser irradiation treatment are presented. The alloy was irradiated in air, argon, and nitrogen atmosphere using the Nd:YAG laser. Laser-induced surface modifications were analyzed by field-emission scanning electron microscopy (FE-SEM), energy-dispersive spectroscopy (EDS), profilometric analysis, and Vickers microhardness measurements. Alloy irradiation under a low laser output energy and a low number of accumulated pulses resulted in the formation of shallow surface craters. An increase of these irradiation parameters caused the appearance of more pronounced surface craters with microcracks and hydrodynamic effects in the form of wave-like structures, ripples, and solidified droplets and consequently caused an increase in the surface roughness. The highest value of the surface roughness of 3.062 μm was attained during the alloy irradiation in argon atmosphere under 15 mJ with 150 accumulated pulses. Interaction of the laser beam with the alloy surface was accompanied by plasma formation and surface ablation due to the irradiation energy absorption. The maximal ablated target material volumes of 5.5 × 1014 nm3 and 2.6 × 1014 nm3 were observed after the irradiation under 15 mJ with 150 accumulated pulses in argon and air atmosphere, respectively. Moreover, attainment of high temperatures at the alloy surface induced its chemical composition alterations. Formation of mixed Ti- and Nb-oxide surface film and absence of nitride particles at the alloy surface was detected irrespective of the irradiation atmosphere. Irradiation in air resulted in the appearance of the most pronounced surface oxide layer with the highest microhardness value which can in great merit influence an increase of the alloy bio-integration abilities and its tribo-corrosion resistance. © 2021 Elsevier B.V.
T2  - Surface and Coatings Technology
T1  - Influence of laser irradiation parameters on the ultrafine-grained Ti45Nb alloy surface characteristics
VL  - 418
SP  - 127255
DO  - 10.1016/j.surfcoat.2021.127255
ER  - 

@article{
author = "Laketić, Slađana and Rakin, Marko and Momčilović, Miloš and Ciganović, Jovan and Veljović, Đorđe N. and Cvijović-Alagić, Ivana",
year = "2021",
abstract = "In the present study surface alterations of the high pressure torsion (HPT)-deformed Ti[sbnd]45Nb (mass%) alloy induced by laser irradiation treatment are presented. The alloy was irradiated in air, argon, and nitrogen atmosphere using the Nd:YAG laser. Laser-induced surface modifications were analyzed by field-emission scanning electron microscopy (FE-SEM), energy-dispersive spectroscopy (EDS), profilometric analysis, and Vickers microhardness measurements. Alloy irradiation under a low laser output energy and a low number of accumulated pulses resulted in the formation of shallow surface craters. An increase of these irradiation parameters caused the appearance of more pronounced surface craters with microcracks and hydrodynamic effects in the form of wave-like structures, ripples, and solidified droplets and consequently caused an increase in the surface roughness. The highest value of the surface roughness of 3.062 μm was attained during the alloy irradiation in argon atmosphere under 15 mJ with 150 accumulated pulses. Interaction of the laser beam with the alloy surface was accompanied by plasma formation and surface ablation due to the irradiation energy absorption. The maximal ablated target material volumes of 5.5 × 1014 nm3 and 2.6 × 1014 nm3 were observed after the irradiation under 15 mJ with 150 accumulated pulses in argon and air atmosphere, respectively. Moreover, attainment of high temperatures at the alloy surface induced its chemical composition alterations. Formation of mixed Ti- and Nb-oxide surface film and absence of nitride particles at the alloy surface was detected irrespective of the irradiation atmosphere. Irradiation in air resulted in the appearance of the most pronounced surface oxide layer with the highest microhardness value which can in great merit influence an increase of the alloy bio-integration abilities and its tribo-corrosion resistance. © 2021 Elsevier B.V.",
journal = "Surface and Coatings Technology",
title = "Influence of laser irradiation parameters on the ultrafine-grained Ti45Nb alloy surface characteristics",
volume = "418",
pages = "127255",
doi = "10.1016/j.surfcoat.2021.127255"
}

Laketić, S., Rakin, M., Momčilović, M., Ciganović, J., Veljović, Đ. N.,& Cvijović-Alagić, I.. (2021). Influence of laser irradiation parameters on the ultrafine-grained Ti45Nb alloy surface characteristics. in Surface and Coatings Technology, 418, 127255.
https://doi.org/10.1016/j.surfcoat.2021.127255

Laketić S, Rakin M, Momčilović M, Ciganović J, Veljović ĐN, Cvijović-Alagić I. Influence of laser irradiation parameters on the ultrafine-grained Ti45Nb alloy surface characteristics. in Surface and Coatings Technology. 2021;418:127255.
doi:10.1016/j.surfcoat.2021.127255 .

Laketić, Slađana, Rakin, Marko, Momčilović, Miloš, Ciganović, Jovan, Veljović, Đorđe N., Cvijović-Alagić, Ivana, "Influence of laser irradiation parameters on the ultrafine-grained Ti45Nb alloy surface characteristics" in Surface and Coatings Technology, 418 (2021):127255,
https://doi.org/10.1016/j.surfcoat.2021.127255 . .

TY  - JOUR
AU  - Barjaktarević, Dragana
AU  - Međo, Bojan
AU  - Štefane, Primož
AU  - Gubeljak, Nenad
AU  - Cvijović-Alagić, Ivana
AU  - Đokić, Veljko
AU  - Rakin, Marko
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9606
AB  - Severe plastic deformation (SPD) is a popular group of techniques applied to achieve the nanostructuring of the metallic biomaterials and improvement of their mechanical characteristics. One of the most commonly used SPD methods is the high-pressure torsion (HPT) technique which enables the obtainment of the microstructure with small grains and high strength. In the present study, the influence of the plastic deformation and surface modification treatment on the tensile and corrosion properties of the Ti–13Nb–13Zr (wt%) alloy is investigated. In that purpose, the coarse-grained (CG) Ti–13Nb–13Zr (TNZ) alloy was subjected to the HPT processing by applying a pressure of 4.1 GPa with a rotational speed of 0.2 rpm and 5 revolutions at room temperature to obtain the ultrafine-grained (UFG) microstructure. The alloy microstructure before and after HPT processing was analysed using the scanning electron microscopy (SEM) and the X-ray diffraction (XRD). The homogeneity of the UFG TNZ alloy was determined by microhardness testing and microscopic observations. The nanotubular oxide layer on the surface of the TNZ alloy, both in CG and UFG condition, was formed by electrochemical anodization in 1 M H3PO4 + NaF electrolyte for 90 min. SEM analysis was used to characterise the morphology of the anodized surfaces, while energy dispersive spectroscopy was applied to determine the chemical composition of the nanostructured layers formed at the alloy surfaces. Mechanical properties of the TNZ alloy, before and after HPT processing and electrochemical anodization, were determined by tensile testing. After tensile testing, the fractographic analysis was conducted to identify the fracture mechanisms. The potentiodynamic polarization technique was used to determine the corrosion resistance of the alloy before and after plastic deformation and surface modification treatment. The obtained results showed that the alloy is reasonably homogeneous after the HPT processing. The XRD analyses reviled the presence of α′ and β phases in the CG TNZ alloy microstructure, while the additional ω phase was detected in the microstructure of the UFG TNZ alloy. The HPT obtained alloy exhibits higher hardness and improved tensile properties than the alloy in the as-received CG condition, while the electrochemical anodization leads to a decrease of its mechanical properties. Both CG and UFG alloys show excellent corrosion stability in Ringer’s solution. Moreover, electrochemical anodization leads to a decrease or an increase of the corrosion resistance of these materials, depending on the morphology of the formed nanotubular surface layers. The results indicate that the anodized CG TNZ alloy is characterized by a lower modulus of elasticity and better corrosion resistance properties than the anodized UFG TNZ alloy. Graphic Abstract: [Figure not available: see fulltext.] © 2020, The Korean Institute of Metals and Materials.
T2  - Metals and Materials International
T1  - Tensile and Corrosion Properties of Anodized Ultrafne‑Grained
Ti–13Nb–13Zr Biomedical Alloy Obtained by High‑Pressure Torsion
VL  - 27
IS  - 9
SP  - 3325
EP  - 3341
DO  - 10.1007/s12540-020-00837-z
ER  - 

@article{
author = "Barjaktarević, Dragana and Međo, Bojan and Štefane, Primož and Gubeljak, Nenad and Cvijović-Alagić, Ivana and Đokić, Veljko and Rakin, Marko",
year = "2021",
abstract = "Severe plastic deformation (SPD) is a popular group of techniques applied to achieve the nanostructuring of the metallic biomaterials and improvement of their mechanical characteristics. One of the most commonly used SPD methods is the high-pressure torsion (HPT) technique which enables the obtainment of the microstructure with small grains and high strength. In the present study, the influence of the plastic deformation and surface modification treatment on the tensile and corrosion properties of the Ti–13Nb–13Zr (wt%) alloy is investigated. In that purpose, the coarse-grained (CG) Ti–13Nb–13Zr (TNZ) alloy was subjected to the HPT processing by applying a pressure of 4.1 GPa with a rotational speed of 0.2 rpm and 5 revolutions at room temperature to obtain the ultrafine-grained (UFG) microstructure. The alloy microstructure before and after HPT processing was analysed using the scanning electron microscopy (SEM) and the X-ray diffraction (XRD). The homogeneity of the UFG TNZ alloy was determined by microhardness testing and microscopic observations. The nanotubular oxide layer on the surface of the TNZ alloy, both in CG and UFG condition, was formed by electrochemical anodization in 1 M H3PO4 + NaF electrolyte for 90 min. SEM analysis was used to characterise the morphology of the anodized surfaces, while energy dispersive spectroscopy was applied to determine the chemical composition of the nanostructured layers formed at the alloy surfaces. Mechanical properties of the TNZ alloy, before and after HPT processing and electrochemical anodization, were determined by tensile testing. After tensile testing, the fractographic analysis was conducted to identify the fracture mechanisms. The potentiodynamic polarization technique was used to determine the corrosion resistance of the alloy before and after plastic deformation and surface modification treatment. The obtained results showed that the alloy is reasonably homogeneous after the HPT processing. The XRD analyses reviled the presence of α′ and β phases in the CG TNZ alloy microstructure, while the additional ω phase was detected in the microstructure of the UFG TNZ alloy. The HPT obtained alloy exhibits higher hardness and improved tensile properties than the alloy in the as-received CG condition, while the electrochemical anodization leads to a decrease of its mechanical properties. Both CG and UFG alloys show excellent corrosion stability in Ringer’s solution. Moreover, electrochemical anodization leads to a decrease or an increase of the corrosion resistance of these materials, depending on the morphology of the formed nanotubular surface layers. The results indicate that the anodized CG TNZ alloy is characterized by a lower modulus of elasticity and better corrosion resistance properties than the anodized UFG TNZ alloy. Graphic Abstract: [Figure not available: see fulltext.] © 2020, The Korean Institute of Metals and Materials.",
journal = "Metals and Materials International",
title = "Tensile and Corrosion Properties of Anodized Ultrafne‑Grained
Ti–13Nb–13Zr Biomedical Alloy Obtained by High‑Pressure Torsion",
volume = "27",
number = "9",
pages = "3325-3341",
doi = "10.1007/s12540-020-00837-z"
}

Barjaktarević, D., Međo, B., Štefane, P., Gubeljak, N., Cvijović-Alagić, I., Đokić, V.,& Rakin, M.. (2021). Tensile and Corrosion Properties of Anodized Ultrafne‑Grained
Ti–13Nb–13Zr Biomedical Alloy Obtained by High‑Pressure Torsion. in Metals and Materials International, 27(9), 3325-3341.
https://doi.org/10.1007/s12540-020-00837-z

Barjaktarević D, Međo B, Štefane P, Gubeljak N, Cvijović-Alagić I, Đokić V, Rakin M. Tensile and Corrosion Properties of Anodized Ultrafne‑Grained
Ti–13Nb–13Zr Biomedical Alloy Obtained by High‑Pressure Torsion. in Metals and Materials International. 2021;27(9):3325-3341.
doi:10.1007/s12540-020-00837-z .

Barjaktarević, Dragana, Međo, Bojan, Štefane, Primož, Gubeljak, Nenad, Cvijović-Alagić, Ivana, Đokić, Veljko, Rakin, Marko, "Tensile and Corrosion Properties of Anodized Ultrafne‑Grained
Ti–13Nb–13Zr Biomedical Alloy Obtained by High‑Pressure Torsion" in Metals and Materials International, 27, no. 9 (2021):3325-3341,
https://doi.org/10.1007/s12540-020-00837-z . .

TY  - JOUR
AU  - Barjaktarević, Dragana
AU  - Međo, Bojan
AU  - Gubeljak, Nenad
AU  - Cvijović-Alagić, Ivana
AU  - Štefane, Primož
AU  - Đokić, Veljko
AU  - Rakin, Marko
PY  - 2020
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9557
AB  - Due to their excellent mechanical properties and corrosion resistance, titanium-based materials are widely represented in aeronautics, chemical industry and medicine, where they are considered the best replacement for damaged hard tissues. In order to obtain optimal properties for medical applications, commercially pure titanium (cpTi) is often alloyed. The ß-type titanium alloys containing Nb, Zr, Ta, Mo, Sn have attracted considerable attention, due to their unique combinations of high strength, low modulus of elasticity, superior corrosion resistance and biocompatibility. Also, titanium-based materials can be processed by surface modifications, including the anodization, which belongs to the group of chemical nanostructured surface modifications. Analysis of microstructure of two-phase Ti-13Nb-13Zr (TNZ) alloy was done by Scanning Electron Microscopy (SEM). Characterisation of surface, obtained by anodization in the H3PO4 + NaF solution, during 90 minutes process, was performed by SEM. Micro Tensile Specimens (MTS) were cut from TNZ and anodized TNZ disks and were subjected to the tensile test using servo-hydraulic testing machine Instron 1255. Stereometric measurement of strain at the surface of the MTS during tension was done using the Aramis system. Results showed that anodization process led to a creation of heterogeneous layer of nanotubes. Anodized TNZ alloy had lower elastic modulus and tensile strength comparing to the initial alloy. In order to better understand tensile behaviour, numerical analysis of non-anodized alloy was done. The 3D numerical model of MTS, which simulated the tensile test, was made in Abaqus software package. Good correlation between experimental and numerical results was obtained. © 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0)
T2  - Procedia Structural Integrity
T1  - Experimental and numerical analysis of tensile properties of Ti-13Nb-13Zr alloy and determination of influence of anodization process
VL  - 28
SP  - 2187
EP  - 2194
DO  - 10.1016/j.prostr.2020.11.047
ER  - 

@article{
author = "Barjaktarević, Dragana and Međo, Bojan and Gubeljak, Nenad and Cvijović-Alagić, Ivana and Štefane, Primož and Đokić, Veljko and Rakin, Marko",
year = "2020",
abstract = "Due to their excellent mechanical properties and corrosion resistance, titanium-based materials are widely represented in aeronautics, chemical industry and medicine, where they are considered the best replacement for damaged hard tissues. In order to obtain optimal properties for medical applications, commercially pure titanium (cpTi) is often alloyed. The ß-type titanium alloys containing Nb, Zr, Ta, Mo, Sn have attracted considerable attention, due to their unique combinations of high strength, low modulus of elasticity, superior corrosion resistance and biocompatibility. Also, titanium-based materials can be processed by surface modifications, including the anodization, which belongs to the group of chemical nanostructured surface modifications. Analysis of microstructure of two-phase Ti-13Nb-13Zr (TNZ) alloy was done by Scanning Electron Microscopy (SEM). Characterisation of surface, obtained by anodization in the H3PO4 + NaF solution, during 90 minutes process, was performed by SEM. Micro Tensile Specimens (MTS) were cut from TNZ and anodized TNZ disks and were subjected to the tensile test using servo-hydraulic testing machine Instron 1255. Stereometric measurement of strain at the surface of the MTS during tension was done using the Aramis system. Results showed that anodization process led to a creation of heterogeneous layer of nanotubes. Anodized TNZ alloy had lower elastic modulus and tensile strength comparing to the initial alloy. In order to better understand tensile behaviour, numerical analysis of non-anodized alloy was done. The 3D numerical model of MTS, which simulated the tensile test, was made in Abaqus software package. Good correlation between experimental and numerical results was obtained. © 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0)",
journal = "Procedia Structural Integrity",
title = "Experimental and numerical analysis of tensile properties of Ti-13Nb-13Zr alloy and determination of influence of anodization process",
volume = "28",
pages = "2187-2194",
doi = "10.1016/j.prostr.2020.11.047"
}

Barjaktarević, D., Međo, B., Gubeljak, N., Cvijović-Alagić, I., Štefane, P., Đokić, V.,& Rakin, M.. (2020). Experimental and numerical analysis of tensile properties of Ti-13Nb-13Zr alloy and determination of influence of anodization process. in Procedia Structural Integrity, 28, 2187-2194.
https://doi.org/10.1016/j.prostr.2020.11.047

Barjaktarević D, Međo B, Gubeljak N, Cvijović-Alagić I, Štefane P, Đokić V, Rakin M. Experimental and numerical analysis of tensile properties of Ti-13Nb-13Zr alloy and determination of influence of anodization process. in Procedia Structural Integrity. 2020;28:2187-2194.
doi:10.1016/j.prostr.2020.11.047 .

Barjaktarević, Dragana, Međo, Bojan, Gubeljak, Nenad, Cvijović-Alagić, Ivana, Štefane, Primož, Đokić, Veljko, Rakin, Marko, "Experimental and numerical analysis of tensile properties of Ti-13Nb-13Zr alloy and determination of influence of anodization process" in Procedia Structural Integrity, 28 (2020):2187-2194,
https://doi.org/10.1016/j.prostr.2020.11.047 . .

TY  - JOUR
AU  - Barjaktarević, Dragana R.
AU  - Đokić, Veljko R.
AU  - Bajat, Jelena B.
AU  - Dimić, Ivana D.
AU  - Cvijović-Alagić, Ivana
AU  - Rakin, Marko P.
PY  - 2019
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/8411
AB  - On the surface of the ultrafine-grained Ti–13Nb–13Zr alloy and the coarse-grained Ti–13Nb–13Zr alloy nanotubular oxide layers were formed by electrochemical anodization in the 1 M H3PO4 + NaF electrolyte in order to evaluate the electrochemical behaviour in the artificial saliva. SEM images showed that homogeneous nanotubular oxide layers could be formed by anodic oxidation of titanium alloys in an electrolyte with fluoride ions. These two titanium alloys, like other materials developed to replace the bone tissue in the human body, have to be highly corrosion resistant, which is one of the most common requirement in terms of the biocompatibility, damage and fracture prevention. The alloys were analysed by means of the electrochemical impedance spectroscopy and potentiodynamic polarization. The analyzed alloys had good corrosion stability, while nanotubular oxide layer improved their corrosion resistance. © 2019 Elsevier Ltd
T2  - Theoretical and Applied Fracture Mechanics
T1  - The influence of the surface nanostructured modification on the corrosion resistance of the ultrafine-grained Ti–13Nb–13Zr alloy in artificial saliva
VL  - 103
SP  - 102307
DO  - 10.1016/j.tafmec.2019.102307
ER  - 

@article{
author = "Barjaktarević, Dragana R. and Đokić, Veljko R. and Bajat, Jelena B. and Dimić, Ivana D. and Cvijović-Alagić, Ivana and Rakin, Marko P.",
year = "2019",
abstract = "On the surface of the ultrafine-grained Ti–13Nb–13Zr alloy and the coarse-grained Ti–13Nb–13Zr alloy nanotubular oxide layers were formed by electrochemical anodization in the 1 M H3PO4 + NaF electrolyte in order to evaluate the electrochemical behaviour in the artificial saliva. SEM images showed that homogeneous nanotubular oxide layers could be formed by anodic oxidation of titanium alloys in an electrolyte with fluoride ions. These two titanium alloys, like other materials developed to replace the bone tissue in the human body, have to be highly corrosion resistant, which is one of the most common requirement in terms of the biocompatibility, damage and fracture prevention. The alloys were analysed by means of the electrochemical impedance spectroscopy and potentiodynamic polarization. The analyzed alloys had good corrosion stability, while nanotubular oxide layer improved their corrosion resistance. © 2019 Elsevier Ltd",
journal = "Theoretical and Applied Fracture Mechanics",
title = "The influence of the surface nanostructured modification on the corrosion resistance of the ultrafine-grained Ti–13Nb–13Zr alloy in artificial saliva",
volume = "103",
pages = "102307",
doi = "10.1016/j.tafmec.2019.102307"
}

Barjaktarević, D. R., Đokić, V. R., Bajat, J. B., Dimić, I. D., Cvijović-Alagić, I.,& Rakin, M. P.. (2019). The influence of the surface nanostructured modification on the corrosion resistance of the ultrafine-grained Ti–13Nb–13Zr alloy in artificial saliva. in Theoretical and Applied Fracture Mechanics, 103, 102307.
https://doi.org/10.1016/j.tafmec.2019.102307

Barjaktarević DR, Đokić VR, Bajat JB, Dimić ID, Cvijović-Alagić I, Rakin MP. The influence of the surface nanostructured modification on the corrosion resistance of the ultrafine-grained Ti–13Nb–13Zr alloy in artificial saliva. in Theoretical and Applied Fracture Mechanics. 2019;103:102307.
doi:10.1016/j.tafmec.2019.102307 .

Barjaktarević, Dragana R., Đokić, Veljko R., Bajat, Jelena B., Dimić, Ivana D., Cvijović-Alagić, Ivana, Rakin, Marko P., "The influence of the surface nanostructured modification on the corrosion resistance of the ultrafine-grained Ti–13Nb–13Zr alloy in artificial saliva" in Theoretical and Applied Fracture Mechanics, 103 (2019):102307,
https://doi.org/10.1016/j.tafmec.2019.102307 . .

TY  - JOUR
AU  - Cvijović-Alagić, Ivana
AU  - Cvijović, Zorica M.
AU  - Rakin, Marko P.
PY  - 2019
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/8468
AB  - Wear damage behavior of new orthopedic Ti-13Nb-13Zr (mass %) alloy with martensitic microstructures developed by different thermo-mechanical treatments were examined during sliding in simulated physiological solution. The results obtained for this alloy processed by cold and hot rolling were compared with that of the standard Ti-6Al-4 V (mass %) alloy heat-treated to produce martensitic microstructure. The block-on-disk sliding friction and wear tests were conducted in Ringer’s solution. The friction coefficient, wear rate, and wear damage mechanisms were determined over a range of normal loads (20–60 N) and linear sliding speeds (0.26–1.0 m/s). The surface damage morphology revealed the presence of corrosive, abrasive, and adhesive wear in all investigated materials. The friction and wear properties were found to be dependent on the predominant wear damage mechanism and applied load/sliding speed combination. In the case of a Ti-13Nb-13Zr alloy, the adhesive wear contributes to the higher wear rate and better friction behavior. This cold-rolled alloy, having a martensitic microstructure with the lowest hardness, shows the lowest friction coefficient values due to high material transfer from the alloy surface. The lowest friction resistance is observed for the Ti-6Al-4 V alloy with the highest hardness since the dominant wear damage mechanism is abrasion resulting in the low wear rate and material transfer.
T2  - International Journal of Damage Mechanics
T1  - Damage behavior of orthopedic titanium alloys with martensitic microstructure during sliding wear in physiological solution
VL  - 28
IS  - 8
SP  - 1228
EP  - 1247
DO  - 10.1177/1056789518823049
ER  - 

@article{
author = "Cvijović-Alagić, Ivana and Cvijović, Zorica M. and Rakin, Marko P.",
year = "2019",
abstract = "Wear damage behavior of new orthopedic Ti-13Nb-13Zr (mass %) alloy with martensitic microstructures developed by different thermo-mechanical treatments were examined during sliding in simulated physiological solution. The results obtained for this alloy processed by cold and hot rolling were compared with that of the standard Ti-6Al-4 V (mass %) alloy heat-treated to produce martensitic microstructure. The block-on-disk sliding friction and wear tests were conducted in Ringer’s solution. The friction coefficient, wear rate, and wear damage mechanisms were determined over a range of normal loads (20–60 N) and linear sliding speeds (0.26–1.0 m/s). The surface damage morphology revealed the presence of corrosive, abrasive, and adhesive wear in all investigated materials. The friction and wear properties were found to be dependent on the predominant wear damage mechanism and applied load/sliding speed combination. In the case of a Ti-13Nb-13Zr alloy, the adhesive wear contributes to the higher wear rate and better friction behavior. This cold-rolled alloy, having a martensitic microstructure with the lowest hardness, shows the lowest friction coefficient values due to high material transfer from the alloy surface. The lowest friction resistance is observed for the Ti-6Al-4 V alloy with the highest hardness since the dominant wear damage mechanism is abrasion resulting in the low wear rate and material transfer.",
journal = "International Journal of Damage Mechanics",
title = "Damage behavior of orthopedic titanium alloys with martensitic microstructure during sliding wear in physiological solution",
volume = "28",
number = "8",
pages = "1228-1247",
doi = "10.1177/1056789518823049"
}

Cvijović-Alagić, I., Cvijović, Z. M.,& Rakin, M. P.. (2019). Damage behavior of orthopedic titanium alloys with martensitic microstructure during sliding wear in physiological solution. in International Journal of Damage Mechanics, 28(8), 1228-1247.
https://doi.org/10.1177/1056789518823049

Cvijović-Alagić I, Cvijović ZM, Rakin MP. Damage behavior of orthopedic titanium alloys with martensitic microstructure during sliding wear in physiological solution. in International Journal of Damage Mechanics. 2019;28(8):1228-1247.
doi:10.1177/1056789518823049 .

Cvijović-Alagić, Ivana, Cvijović, Zorica M., Rakin, Marko P., "Damage behavior of orthopedic titanium alloys with martensitic microstructure during sliding wear in physiological solution" in International Journal of Damage Mechanics, 28, no. 8 (2019):1228-1247,
https://doi.org/10.1177/1056789518823049 . .

TY  - JOUR
AU  - Cvijović-Alagić, Ivana
AU  - Cvijović, Zorica M.
AU  - Maletaškić, Jelena
AU  - Rakin, Marko P.
PY  - 2018
UR  - https://linkinghub.elsevier.com/retrieve/pii/S0921509318311717
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/7859
AB  - effect of initial microstructure on the mechanical properties and fracture mode of the Ti-6Al-4V ELI alloy subjected to the high-pressure torsion (HPT) processing at room temperature and 500 °C was investigated. In this purpose, the four different microstructures (fully lamellar, martensitic, equiaxed and globular microstructures) were developed by the proper heat treatments. The results showed that the application of the HPT processing provided substantial microstructural refinement, independent on the alloy initial microstructure. As a consequence, the alloy hardness, tensile strength and ductility significantly increased. At the same time, the elastic modulus of the HPT-processed alloy is almost 2 times lower as compared to that of the alloy in the initial heat treated state. The obtained improvements strongly depend on the alloy initial microstructure and HPT processing temperature. It was found that the initial martensitic microstructure is beneficial to improve the hardness, tensile and fracture properties. The HPT processing at 500 °C enhanced them more effectively. After the warm HPT processing, alloy with the initial martensitic microstructure exhibited exceptional hardness (455 MPa), high ultimate tensile strength (1546 MPa), high elongation to failure (18.8%) and low elastic modulus (78.6 GPa). Although the alloy with initial fully lamellar microstructure displayed the lowest elastic modulus (68 GPa), the ultrafine and homogeneous (α + β) two-phase microstructure produced by the HPT processing of the alloy with initial martensitic microstructure offered the best combination of the strength-ductility balance and strength-to-elastic modulus ratio (19.8 × 10−3). The complex fracture process, involving transgranular quasi-cleavage and ductile dimple fracture mode, corresponded to the changes in ductility.
T2  - Materials Science and Engineering: A
T1  - Initial microstructure effect on the mechanical properties of Ti-6Al-4V ELI alloy processed by high-pressure torsion
VL  - 736
SP  - 175
EP  - 192
DO  - 10.1016/j.msea.2018.08.094
ER  - 

@article{
author = "Cvijović-Alagić, Ivana and Cvijović, Zorica M. and Maletaškić, Jelena and Rakin, Marko P.",
year = "2018",
abstract = "effect of initial microstructure on the mechanical properties and fracture mode of the Ti-6Al-4V ELI alloy subjected to the high-pressure torsion (HPT) processing at room temperature and 500 °C was investigated. In this purpose, the four different microstructures (fully lamellar, martensitic, equiaxed and globular microstructures) were developed by the proper heat treatments. The results showed that the application of the HPT processing provided substantial microstructural refinement, independent on the alloy initial microstructure. As a consequence, the alloy hardness, tensile strength and ductility significantly increased. At the same time, the elastic modulus of the HPT-processed alloy is almost 2 times lower as compared to that of the alloy in the initial heat treated state. The obtained improvements strongly depend on the alloy initial microstructure and HPT processing temperature. It was found that the initial martensitic microstructure is beneficial to improve the hardness, tensile and fracture properties. The HPT processing at 500 °C enhanced them more effectively. After the warm HPT processing, alloy with the initial martensitic microstructure exhibited exceptional hardness (455 MPa), high ultimate tensile strength (1546 MPa), high elongation to failure (18.8%) and low elastic modulus (78.6 GPa). Although the alloy with initial fully lamellar microstructure displayed the lowest elastic modulus (68 GPa), the ultrafine and homogeneous (α + β) two-phase microstructure produced by the HPT processing of the alloy with initial martensitic microstructure offered the best combination of the strength-ductility balance and strength-to-elastic modulus ratio (19.8 × 10−3). The complex fracture process, involving transgranular quasi-cleavage and ductile dimple fracture mode, corresponded to the changes in ductility.",
journal = "Materials Science and Engineering: A",
title = "Initial microstructure effect on the mechanical properties of Ti-6Al-4V ELI alloy processed by high-pressure torsion",
volume = "736",
pages = "175-192",
doi = "10.1016/j.msea.2018.08.094"
}

Cvijović-Alagić, I., Cvijović, Z. M., Maletaškić, J.,& Rakin, M. P.. (2018). Initial microstructure effect on the mechanical properties of Ti-6Al-4V ELI alloy processed by high-pressure torsion. in Materials Science and Engineering: A, 736, 175-192.
https://doi.org/10.1016/j.msea.2018.08.094

Cvijović-Alagić I, Cvijović ZM, Maletaškić J, Rakin MP. Initial microstructure effect on the mechanical properties of Ti-6Al-4V ELI alloy processed by high-pressure torsion. in Materials Science and Engineering: A. 2018;736:175-192.
doi:10.1016/j.msea.2018.08.094 .

Cvijović-Alagić, Ivana, Cvijović, Zorica M., Maletaškić, Jelena, Rakin, Marko P., "Initial microstructure effect on the mechanical properties of Ti-6Al-4V ELI alloy processed by high-pressure torsion" in Materials Science and Engineering: A, 736 (2018):175-192,
https://doi.org/10.1016/j.msea.2018.08.094 . .

TY  - CONF
AU  - Barjaktarević, Dragana R.
AU  - Bajat, Jelena B.
AU  - Cvijović-Alagić, Ivana
AU  - Dimić, Ivana
AU  - Hohenwarter, Anton
AU  - Đokić, Veljko R.
AU  - Rakin, Marko P.
PY  - 2018
UR  - https://linkinghub.elsevier.com/retrieve/pii/S2452321618305730
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/8164
AB  - In order to optimize and enhance the implant material properties, metallic materials may be modified by severe plastic deformation (SPD) procedures. One of the most attracting SPD methods is high-pressure torsion (HPT), which is method where deformation is obtained mainly by simple shear. In the present study ultrafine-grained titanium (UFG cpTi) and ultrafine-grained Ti-13Nb-13Zr (UFG TNZ) alloy were obtained by high pressure torsion (HPT) under a pressure of 4.1 GPa with a rotational speed of 0.2 rpm up to 5 rotations at room temperature. In order to analyse microstructure of materials before and after HPT process, scanning electron microscope (SEM) was used. The aim of this study was to determine the corrosion resistance of titanium and its alloy after HPT process. Electrochemical measurements were performed in artificial saliva with a pH value of 5.5 at 37°C, in order to simulate the oral environment. The materials were analysed by electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization. All examined materials showed good corrosion resistance, but results indicate that HPT process can improves corrosion resistance. © 2018 The Authors.
C3  - Procedia Structural Integrity
T1  - The corrosion resistance in artificial saliva of titanium and Ti-13Nb-13Zr alloy processed by high pressure torsion
VL  - 13
SP  - 1834
EP  - 1839
DO  - 10.1016/j.prostr.2018.12.332
ER  - 

@conference{
author = "Barjaktarević, Dragana R. and Bajat, Jelena B. and Cvijović-Alagić, Ivana and Dimić, Ivana and Hohenwarter, Anton and Đokić, Veljko R. and Rakin, Marko P.",
year = "2018",
abstract = "In order to optimize and enhance the implant material properties, metallic materials may be modified by severe plastic deformation (SPD) procedures. One of the most attracting SPD methods is high-pressure torsion (HPT), which is method where deformation is obtained mainly by simple shear. In the present study ultrafine-grained titanium (UFG cpTi) and ultrafine-grained Ti-13Nb-13Zr (UFG TNZ) alloy were obtained by high pressure torsion (HPT) under a pressure of 4.1 GPa with a rotational speed of 0.2 rpm up to 5 rotations at room temperature. In order to analyse microstructure of materials before and after HPT process, scanning electron microscope (SEM) was used. The aim of this study was to determine the corrosion resistance of titanium and its alloy after HPT process. Electrochemical measurements were performed in artificial saliva with a pH value of 5.5 at 37°C, in order to simulate the oral environment. The materials were analysed by electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization. All examined materials showed good corrosion resistance, but results indicate that HPT process can improves corrosion resistance. © 2018 The Authors.",
journal = "Procedia Structural Integrity",
title = "The corrosion resistance in artificial saliva of titanium and Ti-13Nb-13Zr alloy processed by high pressure torsion",
volume = "13",
pages = "1834-1839",
doi = "10.1016/j.prostr.2018.12.332"
}

Barjaktarević, D. R., Bajat, J. B., Cvijović-Alagić, I., Dimić, I., Hohenwarter, A., Đokić, V. R.,& Rakin, M. P.. (2018). The corrosion resistance in artificial saliva of titanium and Ti-13Nb-13Zr alloy processed by high pressure torsion. in Procedia Structural Integrity, 13, 1834-1839.
https://doi.org/10.1016/j.prostr.2018.12.332

Barjaktarević DR, Bajat JB, Cvijović-Alagić I, Dimić I, Hohenwarter A, Đokić VR, Rakin MP. The corrosion resistance in artificial saliva of titanium and Ti-13Nb-13Zr alloy processed by high pressure torsion. in Procedia Structural Integrity. 2018;13:1834-1839.
doi:10.1016/j.prostr.2018.12.332 .

Barjaktarević, Dragana R., Bajat, Jelena B., Cvijović-Alagić, Ivana, Dimić, Ivana, Hohenwarter, Anton, Đokić, Veljko R., Rakin, Marko P., "The corrosion resistance in artificial saliva of titanium and Ti-13Nb-13Zr alloy processed by high pressure torsion" in Procedia Structural Integrity, 13 (2018):1834-1839,
https://doi.org/10.1016/j.prostr.2018.12.332 . .

TY  - CONF
AU  - Barjaktarević, Dragana R.
AU  - Dimić, Ivana D.
AU  - Cvijović-Alagić, Ivana
AU  - Đokić, Veljko R.
AU  - Rakin, Marko P.
PY  - 2018
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/8736
PB  - Belgrade : Serbian Academy of Sciences and Arts
C3  - Program and Book of Abstracts / First International Conference on Electron Microscopy of Nanostructures ELMINA 2018, August 27-29, 2018, Belgrade, Serbia
T1  - Morphology of Nanotubular Oxide Layer Formation on Titanium and Titanium Alloy Using Electrochemical Anodization
SP  - 160
EP  - 162
UR  - https://hdl.handle.net/21.15107/rcub_vinar_8736
ER  - 

@conference{
author = "Barjaktarević, Dragana R. and Dimić, Ivana D. and Cvijović-Alagić, Ivana and Đokić, Veljko R. and Rakin, Marko P.",
year = "2018",
publisher = "Belgrade : Serbian Academy of Sciences and Arts",
journal = "Program and Book of Abstracts / First International Conference on Electron Microscopy of Nanostructures ELMINA 2018, August 27-29, 2018, Belgrade, Serbia",
title = "Morphology of Nanotubular Oxide Layer Formation on Titanium and Titanium Alloy Using Electrochemical Anodization",
pages = "160-162",
url = "https://hdl.handle.net/21.15107/rcub_vinar_8736"
}

Barjaktarević, D. R., Dimić, I. D., Cvijović-Alagić, I., Đokić, V. R.,& Rakin, M. P.. (2018). Morphology of Nanotubular Oxide Layer Formation on Titanium and Titanium Alloy Using Electrochemical Anodization. in Program and Book of Abstracts / First International Conference on Electron Microscopy of Nanostructures ELMINA 2018, August 27-29, 2018, Belgrade, Serbia
Belgrade : Serbian Academy of Sciences and Arts., 160-162.
https://hdl.handle.net/21.15107/rcub_vinar_8736

Barjaktarević DR, Dimić ID, Cvijović-Alagić I, Đokić VR, Rakin MP. Morphology of Nanotubular Oxide Layer Formation on Titanium and Titanium Alloy Using Electrochemical Anodization. in Program and Book of Abstracts / First International Conference on Electron Microscopy of Nanostructures ELMINA 2018, August 27-29, 2018, Belgrade, Serbia. 2018;:160-162.
https://hdl.handle.net/21.15107/rcub_vinar_8736 .

Barjaktarević, Dragana R., Dimić, Ivana D., Cvijović-Alagić, Ivana, Đokić, Veljko R., Rakin, Marko P., "Morphology of Nanotubular Oxide Layer Formation on Titanium and Titanium Alloy Using Electrochemical Anodization" in Program and Book of Abstracts / First International Conference on Electron Microscopy of Nanostructures ELMINA 2018, August 27-29, 2018, Belgrade, Serbia (2018):160-162,
https://hdl.handle.net/21.15107/rcub_vinar_8736 .

TY  - JOUR
AU  - Barjaktarević, Dragana R.
AU  - Dimić, Ivana 
AU  - Cvijović-Alagić, Ivana
AU  - Veljović, Đorđe N.
AU  - Rakin, Marko P.
PY  - 2017
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/1854
AB  - The enhancement of commercially pure titanium (cpTi) mechanical properties, which is required for its medical application, can be achieved by grain refinement obtained by severe plastic deformation. In addition to mechanical properties improvement, excellent corrosion resistance of ultrafine-grained (UFG) cpTi in contact with human body fluids is required. Therefore, the aim of this study was to estimate electrochemical behavior of UFG cpTi obtained by high pressure torsion (HPT) under a pressure of 7,8 GPa at room temperature and up to 5 rotations. Electrochemical measurements were performed in artificial saliva at 37 degrees C in order to simulate oral environment, since development of UFG cpTi is primarily aimed for dental implant applications. Electrochemical behavior of UFG cpTi was investigated by electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization. The obtained results indicate that HPT process, through significant grain size reduction, increases corrosion resistance of cpTi.
T2  - Tehnički vjesnik - Technical Gazette
T1  - Corrosion Resistance of High Pressure Torsion Obtained Commercially Pure Titanium in Acidic Solution
VL  - 24
IS  - 6
SP  - 1689
EP  - 1695
DO  - 10.17559/TV-20160303141534
ER  - 

@article{
author = "Barjaktarević, Dragana R. and Dimić, Ivana  and Cvijović-Alagić, Ivana and Veljović, Đorđe N. and Rakin, Marko P.",
year = "2017",
abstract = "The enhancement of commercially pure titanium (cpTi) mechanical properties, which is required for its medical application, can be achieved by grain refinement obtained by severe plastic deformation. In addition to mechanical properties improvement, excellent corrosion resistance of ultrafine-grained (UFG) cpTi in contact with human body fluids is required. Therefore, the aim of this study was to estimate electrochemical behavior of UFG cpTi obtained by high pressure torsion (HPT) under a pressure of 7,8 GPa at room temperature and up to 5 rotations. Electrochemical measurements were performed in artificial saliva at 37 degrees C in order to simulate oral environment, since development of UFG cpTi is primarily aimed for dental implant applications. Electrochemical behavior of UFG cpTi was investigated by electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization. The obtained results indicate that HPT process, through significant grain size reduction, increases corrosion resistance of cpTi.",
journal = "Tehnički vjesnik - Technical Gazette",
title = "Corrosion Resistance of High Pressure Torsion Obtained Commercially Pure Titanium in Acidic Solution",
volume = "24",
number = "6",
pages = "1689-1695",
doi = "10.17559/TV-20160303141534"
}

Barjaktarević, D. R., Dimić, I., Cvijović-Alagić, I., Veljović, Đ. N.,& Rakin, M. P.. (2017). Corrosion Resistance of High Pressure Torsion Obtained Commercially Pure Titanium in Acidic Solution. in Tehnički vjesnik - Technical Gazette, 24(6), 1689-1695.
https://doi.org/10.17559/TV-20160303141534

Barjaktarević DR, Dimić I, Cvijović-Alagić I, Veljović ĐN, Rakin MP. Corrosion Resistance of High Pressure Torsion Obtained Commercially Pure Titanium in Acidic Solution. in Tehnički vjesnik - Technical Gazette. 2017;24(6):1689-1695.
doi:10.17559/TV-20160303141534 .

Barjaktarević, Dragana R., Dimić, Ivana , Cvijović-Alagić, Ivana, Veljović, Đorđe N., Rakin, Marko P., "Corrosion Resistance of High Pressure Torsion Obtained Commercially Pure Titanium in Acidic Solution" in Tehnički vjesnik - Technical Gazette, 24, no. 6 (2017):1689-1695,
https://doi.org/10.17559/TV-20160303141534 . .

TY  - JOUR
AU  - Musraty, Walid
AU  - Međo, Bojan
AU  - Gubeljak, Nenad
AU  - Likeb, Andrej
AU  - Cvijović-Alagić, Ivana
AU  - Sedmak, Aleksandar S.
AU  - Rakin, Marko P.
PY  - 2017
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/1532
AB  - Integrity of pipes is typically assessed by testing fracture mechanics specimens, such as compact tensile (CT) or single-edge notched bending (SENB). However, for some pipe dimensions it is not easy or possible to fabricate a specimen conforming to the requirements of standard procedures. A new type of specimen is proposed recently, which can be advantageous for relatively small pipe diameters and axial defects - the pipe ring notch bend specimen - PRNB. In this work, criteria for failure by ductile fracture of PRNB specimens are determined experimentally and by application of micromechanical analysis. The influence of size of the specimen, as well as size and shape of the stress concentrator, is analysed. The results of this study, along with previous authors results, lead to the conclusion that the pipe ring specimens can be applied in integrity assessment of pipes with defects. Also, the benefits of their application include much simpler fabrication and the same material history as the pipe itself. (C) 2017 Elsevier Ltd. All rights reserved.
T2  - Engineering Fracture Mechanics
T1  - Ductile fracture of pipe-ring notched bend specimens - Micromechanical analysis
VL  - 175
SP  - 247
EP  - 261
DO  - 10.1016/j.engfracmech.2017.01.022
ER  - 

@article{
author = "Musraty, Walid and Međo, Bojan and Gubeljak, Nenad and Likeb, Andrej and Cvijović-Alagić, Ivana and Sedmak, Aleksandar S. and Rakin, Marko P.",
year = "2017",
abstract = "Integrity of pipes is typically assessed by testing fracture mechanics specimens, such as compact tensile (CT) or single-edge notched bending (SENB). However, for some pipe dimensions it is not easy or possible to fabricate a specimen conforming to the requirements of standard procedures. A new type of specimen is proposed recently, which can be advantageous for relatively small pipe diameters and axial defects - the pipe ring notch bend specimen - PRNB. In this work, criteria for failure by ductile fracture of PRNB specimens are determined experimentally and by application of micromechanical analysis. The influence of size of the specimen, as well as size and shape of the stress concentrator, is analysed. The results of this study, along with previous authors results, lead to the conclusion that the pipe ring specimens can be applied in integrity assessment of pipes with defects. Also, the benefits of their application include much simpler fabrication and the same material history as the pipe itself. (C) 2017 Elsevier Ltd. All rights reserved.",
journal = "Engineering Fracture Mechanics",
title = "Ductile fracture of pipe-ring notched bend specimens - Micromechanical analysis",
volume = "175",
pages = "247-261",
doi = "10.1016/j.engfracmech.2017.01.022"
}

Musraty, W., Međo, B., Gubeljak, N., Likeb, A., Cvijović-Alagić, I., Sedmak, A. S.,& Rakin, M. P.. (2017). Ductile fracture of pipe-ring notched bend specimens - Micromechanical analysis. in Engineering Fracture Mechanics, 175, 247-261.
https://doi.org/10.1016/j.engfracmech.2017.01.022

Musraty W, Međo B, Gubeljak N, Likeb A, Cvijović-Alagić I, Sedmak AS, Rakin MP. Ductile fracture of pipe-ring notched bend specimens - Micromechanical analysis. in Engineering Fracture Mechanics. 2017;175:247-261.
doi:10.1016/j.engfracmech.2017.01.022 .

Musraty, Walid, Međo, Bojan, Gubeljak, Nenad, Likeb, Andrej, Cvijović-Alagić, Ivana, Sedmak, Aleksandar S., Rakin, Marko P., "Ductile fracture of pipe-ring notched bend specimens - Micromechanical analysis" in Engineering Fracture Mechanics, 175 (2017):247-261,
https://doi.org/10.1016/j.engfracmech.2017.01.022 . .

TY  - JOUR
AU  - Barjaktarević, Dragana R.
AU  - Cvijović-Alagić, Ivana
AU  - Dimić, Ivana
AU  - Đokić, Veljko R.
AU  - Rakin, Marko P.
PY  - 2016
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/1709
AB  - Commercially pure titanium (cpTi) and titanium alloys are the most commonly used metallic biomaterials. Biomedical requirements for the successful usage of metallic implant materials include their high mechanical strength, low elastic modulus, excellent biocompatibility and high corrosion resistance. It is evident that the response of a biomaterial implanted into the human body depends entirely on its biocompatibility and surface properties. Therefore, in order to improve the performance of biomaterials in biological systems modification of their surface is necessary. One of most commonly used method of implant materials surface modification is electrochemical anodization and this method is reviewed in the present work. Aim of the presented review article is to explain the electrochemical anodization process and the way in which the nanotubes are formed by anodization on the metallic material surface. Influence of anodizing parameters on the nanotubes characteristics, such as nanotube diameter, length and nanotubular layer thickness, are described, as well as the anodized nanotubes influence on the material surface properties, corrosion resistance and biocompatibility.
T2  - Metallurgical and Materials Engineering
T1  - Anodization of Ti-Based Materials for Biomedical Applications: a Review
VL  - 22
IS  - 3
SP  - 129
EP  - 143
DO  - 10.30544/209
UR  - https://hdl.handle.net/21.15107/rcub_vinar_1709
ER  - 

@article{
author = "Barjaktarević, Dragana R. and Cvijović-Alagić, Ivana and Dimić, Ivana and Đokić, Veljko R. and Rakin, Marko P.",
year = "2016",
abstract = "Commercially pure titanium (cpTi) and titanium alloys are the most commonly used metallic biomaterials. Biomedical requirements for the successful usage of metallic implant materials include their high mechanical strength, low elastic modulus, excellent biocompatibility and high corrosion resistance. It is evident that the response of a biomaterial implanted into the human body depends entirely on its biocompatibility and surface properties. Therefore, in order to improve the performance of biomaterials in biological systems modification of their surface is necessary. One of most commonly used method of implant materials surface modification is electrochemical anodization and this method is reviewed in the present work. Aim of the presented review article is to explain the electrochemical anodization process and the way in which the nanotubes are formed by anodization on the metallic material surface. Influence of anodizing parameters on the nanotubes characteristics, such as nanotube diameter, length and nanotubular layer thickness, are described, as well as the anodized nanotubes influence on the material surface properties, corrosion resistance and biocompatibility.",
journal = "Metallurgical and Materials Engineering",
title = "Anodization of Ti-Based Materials for Biomedical Applications: a Review",
volume = "22",
number = "3",
pages = "129-143",
doi = "10.30544/209",
url = "https://hdl.handle.net/21.15107/rcub_vinar_1709"
}

Barjaktarević, D. R., Cvijović-Alagić, I., Dimić, I., Đokić, V. R.,& Rakin, M. P.. (2016). Anodization of Ti-Based Materials for Biomedical Applications: a Review. in Metallurgical and Materials Engineering, 22(3), 129-143.
https://doi.org/10.30544/209
https://hdl.handle.net/21.15107/rcub_vinar_1709

Barjaktarević DR, Cvijović-Alagić I, Dimić I, Đokić VR, Rakin MP. Anodization of Ti-Based Materials for Biomedical Applications: a Review. in Metallurgical and Materials Engineering. 2016;22(3):129-143.
doi:10.30544/209
https://hdl.handle.net/21.15107/rcub_vinar_1709 .

Barjaktarević, Dragana R., Cvijović-Alagić, Ivana, Dimić, Ivana, Đokić, Veljko R., Rakin, Marko P., "Anodization of Ti-Based Materials for Biomedical Applications: a Review" in Metallurgical and Materials Engineering, 22, no. 3 (2016):129-143,
https://doi.org/10.30544/209 .,
https://hdl.handle.net/21.15107/rcub_vinar_1709 .

TY  - JOUR
AU  - Dimić, Ivana 
AU  - Cvijović-Alagić, Ivana
AU  - Voelker, Bernhard
AU  - Hohenwarter, Anton
AU  - Pippan, Reinhard
AU  - Veljović, Đorđe N.
AU  - Rakin, Marko P.
AU  - Bugarski, Branko M.
PY  - 2016
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/871
AB  - Significant enhancement of mechanical properties of metallic biomaterials can be achieved by grain refinement obtained by severe plastic deformation. The purpose of this study was to determine metallic ion release from commercially pure titanium (CPTi) and Ti-13Nb-13Zr alloy processed by high pressure torsion (HPT). The materials microstructures, in the initial state and after HPT deformation, were examined by scanning and transmission electron microscopy. The microhardness was determined along the radius of the disc-shaped samples of ultrafine-grained (UFG) CPTi and Ti-13Nb-13Zr alloy in order to evaluate homogeneity of HPT-processed materials. The quantities of released ions were determined using inductively coupled plasma-mass spectrophotometer for samples immersed in artificial saliva at 37 degrees C for 7 days. Also, the effect of artificial saliva pH value on metallic ion release was estimated. Obtained results revealed that the quantities of released ions from UFG CPTi and Ti-13Nb-13Zr alloy obtained by HPT process were higher than the quantities of released ions from CPTi and Ti-13Nb-13Zr alloy produced by traditional casting. This behavior can be explained by the fact that metallic ions are easily released from microstructure with smaller grains achieved by HPT process. (C) 2015 Elsevier Ltd. All rights reserved.
PB  - Elsevier
T2  - Materials and Design
T1  - Microstructure and metallic ion release of pure titanium and Ti-13Nb-13Zr alloy processed by high pressure torsion
VL  - 91
SP  - 340
EP  - 347
DO  - 10.1016/j.matdes.2015.11.088
ER  - 

@article{
author = "Dimić, Ivana  and Cvijović-Alagić, Ivana and Voelker, Bernhard and Hohenwarter, Anton and Pippan, Reinhard and Veljović, Đorđe N. and Rakin, Marko P. and Bugarski, Branko M.",
year = "2016",
abstract = "Significant enhancement of mechanical properties of metallic biomaterials can be achieved by grain refinement obtained by severe plastic deformation. The purpose of this study was to determine metallic ion release from commercially pure titanium (CPTi) and Ti-13Nb-13Zr alloy processed by high pressure torsion (HPT). The materials microstructures, in the initial state and after HPT deformation, were examined by scanning and transmission electron microscopy. The microhardness was determined along the radius of the disc-shaped samples of ultrafine-grained (UFG) CPTi and Ti-13Nb-13Zr alloy in order to evaluate homogeneity of HPT-processed materials. The quantities of released ions were determined using inductively coupled plasma-mass spectrophotometer for samples immersed in artificial saliva at 37 degrees C for 7 days. Also, the effect of artificial saliva pH value on metallic ion release was estimated. Obtained results revealed that the quantities of released ions from UFG CPTi and Ti-13Nb-13Zr alloy obtained by HPT process were higher than the quantities of released ions from CPTi and Ti-13Nb-13Zr alloy produced by traditional casting. This behavior can be explained by the fact that metallic ions are easily released from microstructure with smaller grains achieved by HPT process. (C) 2015 Elsevier Ltd. All rights reserved.",
publisher = "Elsevier",
journal = "Materials and Design",
title = "Microstructure and metallic ion release of pure titanium and Ti-13Nb-13Zr alloy processed by high pressure torsion",
volume = "91",
pages = "340-347",
doi = "10.1016/j.matdes.2015.11.088"
}

Dimić, I., Cvijović-Alagić, I., Voelker, B., Hohenwarter, A., Pippan, R., Veljović, Đ. N., Rakin, M. P.,& Bugarski, B. M.. (2016). Microstructure and metallic ion release of pure titanium and Ti-13Nb-13Zr alloy processed by high pressure torsion. in Materials and Design
Elsevier., 91, 340-347.
https://doi.org/10.1016/j.matdes.2015.11.088

Dimić I, Cvijović-Alagić I, Voelker B, Hohenwarter A, Pippan R, Veljović ĐN, Rakin MP, Bugarski BM. Microstructure and metallic ion release of pure titanium and Ti-13Nb-13Zr alloy processed by high pressure torsion. in Materials and Design. 2016;91:340-347.
doi:10.1016/j.matdes.2015.11.088 .

Dimić, Ivana , Cvijović-Alagić, Ivana, Voelker, Bernhard, Hohenwarter, Anton, Pippan, Reinhard, Veljović, Đorđe N., Rakin, Marko P., Bugarski, Branko M., "Microstructure and metallic ion release of pure titanium and Ti-13Nb-13Zr alloy processed by high pressure torsion" in Materials and Design, 91 (2016):340-347,
https://doi.org/10.1016/j.matdes.2015.11.088 . .

TY  - JOUR
AU  - Cvijović-Alagić, Ivana
AU  - Cvijović, Zorica M.
AU  - Bajat, Jelena B.
AU  - Rakin, Marko P.
PY  - 2016
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/1280
AB  - The electrochemical behaviour of the Ti-6Al-4V ELI alloy with different microstructures was investigated in Ringers solution at 25 degrees C. It was found that the properties of both inner barrier and outer porous layers of the passive film were dependent on the microstructural morphology and distribution of the alloying elements resulting in various amounts of their oxides incorporated in the TiO2 matrix. A more resistant and capacitive barrier layer formed on the alloy with fully lamellar, martensitic and globular microstructures in different thickness assured its high corrosion protection. The improved corrosion resistance of the alloy with equiaxed microstructure was provided by the existence of the larger amounts of the Al2O3 and V2O5 oxides, contributing to higher resistance of the outer porous layer. The Al2O3 amount is smaller than that of the V2O5 oxide due to its higher dissolution, especially in the case of the alloy with fully lamellar microstructure, resulting in the formation of a more porous outer layer.
T2  - Materials and Corrosion (Werkstoffe und Korrosion)
T1  - Electrochemical behaviour of Ti-6Al-4V alloy with different microstructures in a simulated bio-environment
VL  - 67
IS  - 10
SP  - 1075
EP  - 1087
DO  - 10.1002/maco.201508796
ER  - 

@article{
author = "Cvijović-Alagić, Ivana and Cvijović, Zorica M. and Bajat, Jelena B. and Rakin, Marko P.",
year = "2016",
abstract = "The electrochemical behaviour of the Ti-6Al-4V ELI alloy with different microstructures was investigated in Ringers solution at 25 degrees C. It was found that the properties of both inner barrier and outer porous layers of the passive film were dependent on the microstructural morphology and distribution of the alloying elements resulting in various amounts of their oxides incorporated in the TiO2 matrix. A more resistant and capacitive barrier layer formed on the alloy with fully lamellar, martensitic and globular microstructures in different thickness assured its high corrosion protection. The improved corrosion resistance of the alloy with equiaxed microstructure was provided by the existence of the larger amounts of the Al2O3 and V2O5 oxides, contributing to higher resistance of the outer porous layer. The Al2O3 amount is smaller than that of the V2O5 oxide due to its higher dissolution, especially in the case of the alloy with fully lamellar microstructure, resulting in the formation of a more porous outer layer.",
journal = "Materials and Corrosion (Werkstoffe und Korrosion)",
title = "Electrochemical behaviour of Ti-6Al-4V alloy with different microstructures in a simulated bio-environment",
volume = "67",
number = "10",
pages = "1075-1087",
doi = "10.1002/maco.201508796"
}

Cvijović-Alagić, I., Cvijović, Z. M., Bajat, J. B.,& Rakin, M. P.. (2016). Electrochemical behaviour of Ti-6Al-4V alloy with different microstructures in a simulated bio-environment. in Materials and Corrosion (Werkstoffe und Korrosion), 67(10), 1075-1087.
https://doi.org/10.1002/maco.201508796

Cvijović-Alagić I, Cvijović ZM, Bajat JB, Rakin MP. Electrochemical behaviour of Ti-6Al-4V alloy with different microstructures in a simulated bio-environment. in Materials and Corrosion (Werkstoffe und Korrosion). 2016;67(10):1075-1087.
doi:10.1002/maco.201508796 .

Cvijović-Alagić, Ivana, Cvijović, Zorica M., Bajat, Jelena B., Rakin, Marko P., "Electrochemical behaviour of Ti-6Al-4V alloy with different microstructures in a simulated bio-environment" in Materials and Corrosion (Werkstoffe und Korrosion), 67, no. 10 (2016):1075-1087,
https://doi.org/10.1002/maco.201508796 . .

TY  - JOUR
AU  - Dimić, Ivana 
AU  - Cvijović-Alagić, Ivana
AU  - Obradović, Nataša
AU  - Petrović, Jelena
AU  - Putić, Slaviša S.
AU  - Rakin, Marko P.
AU  - Bugarski, Branko M.
PY  - 2015
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/870
AB  - Metallic materials, such as Co-Cr-Mo alloys, are exposed to aggressive conditions in the oral cavity that represents an ideal environment for metallic ion release and biodegradation. The metallic ions released from dental materials can cause local and/or systemic adverse effects in the human body. Therefore, dental materials are required to possess appropriate mechanical, physical, chemical and biological properties. The biocompatibility of metallic materials is very important for dental applications. Accordingly, the aim of this study was to examine metallic ion release and cytotoxicity of Co-30Cr-5Mo cast alloy as the initial phase of biocompatibility evaluation. Determination of the viability of human (MRC-5) and animal (L929) fibroblast cells were conducted using three in vitro test methods: the colorimetric methyl-thiazol-tetrazolium (MTT) test, the dye exclusion test (DET) and the agar diffusion test (ADT). Furthermore, the morphology and growth of the cells were analyzed using scanning electron microscopy (SEM). The obtained results indicated that Co-30Cr-5Mo alloy did not release harmful elements in concentrations high enough to have detrimental effects on human and animal fibroblasts under the given experimental conditions. Moreover, the fibroblast cells showed good adhesion on the surface of the Co-30Cr-5Mo alloy. Therefore, it could be concluded that Co-30Cr-5Mo alloy is a biocompatible material that could be safely used in dentistry.
T2  - Journal of the Serbian Chemical Society
T1  - In vitro biocompatibility assessment of Co-Cr-Mo dental cast alloy
VL  - 80
IS  - 12
SP  - 1541
EP  - 1552
DO  - 10.2298/JSC150505070M
ER  - 

@article{
author = "Dimić, Ivana  and Cvijović-Alagić, Ivana and Obradović, Nataša and Petrović, Jelena and Putić, Slaviša S. and Rakin, Marko P. and Bugarski, Branko M.",
year = "2015",
abstract = "Metallic materials, such as Co-Cr-Mo alloys, are exposed to aggressive conditions in the oral cavity that represents an ideal environment for metallic ion release and biodegradation. The metallic ions released from dental materials can cause local and/or systemic adverse effects in the human body. Therefore, dental materials are required to possess appropriate mechanical, physical, chemical and biological properties. The biocompatibility of metallic materials is very important for dental applications. Accordingly, the aim of this study was to examine metallic ion release and cytotoxicity of Co-30Cr-5Mo cast alloy as the initial phase of biocompatibility evaluation. Determination of the viability of human (MRC-5) and animal (L929) fibroblast cells were conducted using three in vitro test methods: the colorimetric methyl-thiazol-tetrazolium (MTT) test, the dye exclusion test (DET) and the agar diffusion test (ADT). Furthermore, the morphology and growth of the cells were analyzed using scanning electron microscopy (SEM). The obtained results indicated that Co-30Cr-5Mo alloy did not release harmful elements in concentrations high enough to have detrimental effects on human and animal fibroblasts under the given experimental conditions. Moreover, the fibroblast cells showed good adhesion on the surface of the Co-30Cr-5Mo alloy. Therefore, it could be concluded that Co-30Cr-5Mo alloy is a biocompatible material that could be safely used in dentistry.",
journal = "Journal of the Serbian Chemical Society",
title = "In vitro biocompatibility assessment of Co-Cr-Mo dental cast alloy",
volume = "80",
number = "12",
pages = "1541-1552",
doi = "10.2298/JSC150505070M"
}

Dimić, I., Cvijović-Alagić, I., Obradović, N., Petrović, J., Putić, S. S., Rakin, M. P.,& Bugarski, B. M.. (2015). In vitro biocompatibility assessment of Co-Cr-Mo dental cast alloy. in Journal of the Serbian Chemical Society, 80(12), 1541-1552.
https://doi.org/10.2298/JSC150505070M

Dimić I, Cvijović-Alagić I, Obradović N, Petrović J, Putić SS, Rakin MP, Bugarski BM. In vitro biocompatibility assessment of Co-Cr-Mo dental cast alloy. in Journal of the Serbian Chemical Society. 2015;80(12):1541-1552.
doi:10.2298/JSC150505070M .

Dimić, Ivana , Cvijović-Alagić, Ivana, Obradović, Nataša, Petrović, Jelena, Putić, Slaviša S., Rakin, Marko P., Bugarski, Branko M., "In vitro biocompatibility assessment of Co-Cr-Mo dental cast alloy" in Journal of the Serbian Chemical Society, 80, no. 12 (2015):1541-1552,
https://doi.org/10.2298/JSC150505070M . .

TY  - JOUR
AU  - Cvijović-Alagić, Ivana
AU  - Cvijović, Zorica M.
AU  - Bajat, Jelena B.
AU  - Rakin, Marko P.
PY  - 2014
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/5977
AB  - The electrochemical behaviour of the Ti-13Nb-13Zr and Ti-6Al-4V ELI alloys with martensitic microstructures was investigated by polarization and electrochemical impedance spectroscopy (EIS) in Ringers solution. The impedance spectra were interpreted by a two time-constants equivalent circuit. Both investigated alloys showed high corrosion resistance, but the thin and uniform passive film on the Ti-6Al-4V ELI alloy surface was more protective. The inner barrier and outer porous layer were highly resistant and capacitive. However, thicker and more porous passive film on the Ti-13Nb-13Zr alloy surface may be beneficial for osteointegration. The suitable thermomechanical processing improved the corrosion resistance of Ti-13Nb-13Zr alloy. (c) 2014 Elsevier Ltd. All rights reserved.
T2  - Corrosion Science
T1  - Composition and processing effects on the electrochemical characteristics of biomedical titanium alloys
VL  - 83
SP  - 245
EP  - 254
DO  - 10.1016/j.corsci.2014.02.017
ER  - 

@article{
author = "Cvijović-Alagić, Ivana and Cvijović, Zorica M. and Bajat, Jelena B. and Rakin, Marko P.",
year = "2014",
abstract = "The electrochemical behaviour of the Ti-13Nb-13Zr and Ti-6Al-4V ELI alloys with martensitic microstructures was investigated by polarization and electrochemical impedance spectroscopy (EIS) in Ringers solution. The impedance spectra were interpreted by a two time-constants equivalent circuit. Both investigated alloys showed high corrosion resistance, but the thin and uniform passive film on the Ti-6Al-4V ELI alloy surface was more protective. The inner barrier and outer porous layer were highly resistant and capacitive. However, thicker and more porous passive film on the Ti-13Nb-13Zr alloy surface may be beneficial for osteointegration. The suitable thermomechanical processing improved the corrosion resistance of Ti-13Nb-13Zr alloy. (c) 2014 Elsevier Ltd. All rights reserved.",
journal = "Corrosion Science",
title = "Composition and processing effects on the electrochemical characteristics of biomedical titanium alloys",
volume = "83",
pages = "245-254",
doi = "10.1016/j.corsci.2014.02.017"
}

Cvijović-Alagić, I., Cvijović, Z. M., Bajat, J. B.,& Rakin, M. P.. (2014). Composition and processing effects on the electrochemical characteristics of biomedical titanium alloys. in Corrosion Science, 83, 245-254.
https://doi.org/10.1016/j.corsci.2014.02.017

Cvijović-Alagić I, Cvijović ZM, Bajat JB, Rakin MP. Composition and processing effects on the electrochemical characteristics of biomedical titanium alloys. in Corrosion Science. 2014;83:245-254.
doi:10.1016/j.corsci.2014.02.017 .

Cvijović-Alagić, Ivana, Cvijović, Zorica M., Bajat, Jelena B., Rakin, Marko P., "Composition and processing effects on the electrochemical characteristics of biomedical titanium alloys" in Corrosion Science, 83 (2014):245-254,
https://doi.org/10.1016/j.corsci.2014.02.017 . .

TY  - JOUR
AU  - Dimić, Ivana 
AU  - Cvijović-Alagić, Ivana
AU  - Kostic, Ivana T.
AU  - Perić-Grujić, Aleksandra A.
AU  - Rakin, Marko P.
AU  - Putić, Slaviša S.
AU  - Bugarski, Branko M.
PY  - 2014
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/310
AB  - Metallic biomaterials, which are mainly used for the damaged hard tissue replacements, are materials with high strength, excellent toughness and good wear resistance. The disadvantages of metals as implant materials are their susceptibility to corrosion, the elastic modulus mismatch between metals and human hard tissues, relatively high density and metallic ion release, which can cause serious health problems. The aim of this study was to examine metallic ion release from Co-Cr-Mo alloy in artificial saliva. In that purpose, alloy samples were immersed into artificial saliva with different pH values (4.0, 5.5 and 7.5). After a certain immersion period (1, 3 and 6 weeks) the concentrations of released ions were determined using inductively coupled plasma-mass spectrometry (ICP-MS). The research findings were used in order to define the dependence between the concentration of released metallic ions, artificial saliva pH values and immersion time. The determined released metallic ions concentrations were compared with literature data in order to describe and better understand the phenomenon of metallic ion release from the biocom-patible cobalt-based alloy.
AB  - Metalni biomaterijali, koji se najčešće koriste za zamenu oštećenih čvrstih tkiva u organizmu čoveka, su materijali velike čvrstoće, žilavosti i otpornosti prema habanju. Nedostaci metala, kao implantnih materijala, su njihova podložnost koroziji, neusklađenost modula elastičnosti metala i čvrstih ljudskih tkiva, velika gustina i otpuštanje metalnih jona koje može da izazove ozbiljne zdravstvene probleme. Cilj ovog rada je bio da se ispita otpuštanje metalnih jona iz Co-Cr-Mo legure u rastvoru veštačke pljuvačke. Uzorci legure su potopljeni u rastvor veštačke pljuvačke različite pH vrednosti (4,0, 5,5 i 7,5). Nakon određenog vremena izlaganja legure veštačkoj pljuvačci (1, 3 i 6 nedelja) određene su koncentracije otpuštenih jona primenom indukcije spregnute plazme sa masenom spektrometrijom (ICP-MS). Dobijeni rezultati su iskorišćeni u cilju definisanja zavisnosti između koncentracije otpuštenih jona, pH vrednosti veštačke pljuvačke i dužine potapanja legure u rastvor veštačke pljuvačke. Osim toga, utvrđene koncentracije otpuštenih metalnih jona iz ispitivane legure su upoređene sa podacima dostupnim u literaturi u cilju što boljeg opisivanja i razumevanja fenomena otpuštanja metalnih jona iz biokompatibilne Co-Cr-Mo legure.
T2  - Chemical Industry and Chemical Engineering Quarterly / CICEQ
T1  - Metallic Ion Release from Biocompatible Cobalt-Based Alloy
VL  - 20
IS  - 4
SP  - 571
EP  - 577
DO  - 10.2298/CICEQ130813039D
ER  - 

@article{
author = "Dimić, Ivana  and Cvijović-Alagić, Ivana and Kostic, Ivana T. and Perić-Grujić, Aleksandra A. and Rakin, Marko P. and Putić, Slaviša S. and Bugarski, Branko M.",
year = "2014",
abstract = "Metallic biomaterials, which are mainly used for the damaged hard tissue replacements, are materials with high strength, excellent toughness and good wear resistance. The disadvantages of metals as implant materials are their susceptibility to corrosion, the elastic modulus mismatch between metals and human hard tissues, relatively high density and metallic ion release, which can cause serious health problems. The aim of this study was to examine metallic ion release from Co-Cr-Mo alloy in artificial saliva. In that purpose, alloy samples were immersed into artificial saliva with different pH values (4.0, 5.5 and 7.5). After a certain immersion period (1, 3 and 6 weeks) the concentrations of released ions were determined using inductively coupled plasma-mass spectrometry (ICP-MS). The research findings were used in order to define the dependence between the concentration of released metallic ions, artificial saliva pH values and immersion time. The determined released metallic ions concentrations were compared with literature data in order to describe and better understand the phenomenon of metallic ion release from the biocom-patible cobalt-based alloy., Metalni biomaterijali, koji se najčešće koriste za zamenu oštećenih čvrstih tkiva u organizmu čoveka, su materijali velike čvrstoće, žilavosti i otpornosti prema habanju. Nedostaci metala, kao implantnih materijala, su njihova podložnost koroziji, neusklađenost modula elastičnosti metala i čvrstih ljudskih tkiva, velika gustina i otpuštanje metalnih jona koje može da izazove ozbiljne zdravstvene probleme. Cilj ovog rada je bio da se ispita otpuštanje metalnih jona iz Co-Cr-Mo legure u rastvoru veštačke pljuvačke. Uzorci legure su potopljeni u rastvor veštačke pljuvačke različite pH vrednosti (4,0, 5,5 i 7,5). Nakon određenog vremena izlaganja legure veštačkoj pljuvačci (1, 3 i 6 nedelja) određene su koncentracije otpuštenih jona primenom indukcije spregnute plazme sa masenom spektrometrijom (ICP-MS). Dobijeni rezultati su iskorišćeni u cilju definisanja zavisnosti između koncentracije otpuštenih jona, pH vrednosti veštačke pljuvačke i dužine potapanja legure u rastvor veštačke pljuvačke. Osim toga, utvrđene koncentracije otpuštenih metalnih jona iz ispitivane legure su upoređene sa podacima dostupnim u literaturi u cilju što boljeg opisivanja i razumevanja fenomena otpuštanja metalnih jona iz biokompatibilne Co-Cr-Mo legure.",
journal = "Chemical Industry and Chemical Engineering Quarterly / CICEQ",
title = "Metallic Ion Release from Biocompatible Cobalt-Based Alloy",
volume = "20",
number = "4",
pages = "571-577",
doi = "10.2298/CICEQ130813039D"
}

Dimić, I., Cvijović-Alagić, I., Kostic, I. T., Perić-Grujić, A. A., Rakin, M. P., Putić, S. S.,& Bugarski, B. M.. (2014). Metallic Ion Release from Biocompatible Cobalt-Based Alloy. in Chemical Industry and Chemical Engineering Quarterly / CICEQ, 20(4), 571-577.
https://doi.org/10.2298/CICEQ130813039D

Dimić I, Cvijović-Alagić I, Kostic IT, Perić-Grujić AA, Rakin MP, Putić SS, Bugarski BM. Metallic Ion Release from Biocompatible Cobalt-Based Alloy. in Chemical Industry and Chemical Engineering Quarterly / CICEQ. 2014;20(4):571-577.
doi:10.2298/CICEQ130813039D .

Dimić, Ivana , Cvijović-Alagić, Ivana, Kostic, Ivana T., Perić-Grujić, Aleksandra A., Rakin, Marko P., Putić, Slaviša S., Bugarski, Branko M., "Metallic Ion Release from Biocompatible Cobalt-Based Alloy" in Chemical Industry and Chemical Engineering Quarterly / CICEQ, 20, no. 4 (2014):571-577,
https://doi.org/10.2298/CICEQ130813039D . .

TY  - JOUR
AU  - Cvijović-Alagić, Ivana
AU  - Gubeljak, Nenad
AU  - Rakin, Marko P.
AU  - Cvijović, Zorica M.
AU  - Geric, K.
PY  - 2014
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/5755
AB  - The effects of microstructural morphology on the fracture behavior of Ti-6Al-4V ELI (extra-low impurity) alloy in two different heat treatment conditions were examined. Alloy was solution treated above (beta ST) and below (alpha + beta ST) beta transus temperature followed by furnace cooling (FC) in order to obtain the fully lamellar and equiaxed microstructures. Tensile and fracture toughness tests were conducted. The crack tip opening displacement (CTOD) and strain distribution near the crack tip were measured on the compact tension (CT) specimen surface by digital stereometric method. The crack propagation resistance (CTOD-R) curves were developed by applying the modified normalization method and critical CTOD values were determined. To identify the microstructural length scale controlling the fracture resistance of this alloy, the crack propagation path and fracture surface morphology were evaluated. It was found that the reduction in the characteristic microstructural dimension of an order of magnitude and significant change in the alpha phase aspect ratio contribute to drastic increase in the tensile properties and decrease in the crack initiation and propagation resistance. The fully lamellar microstructure displays slightly better biocompatibility because of the lower elastic modulus and superior fracture resistance. The enhanced crack propagation resistance of this microstructure is associated with the larger propensity for crack tip tortuousity, due to the coarser microstructural dimensions (lamellar colony size vs. primary alpha grain size). The difference in the crack propagation modes affects the shape and size of the actual crack tip strain distribution. These results were discussed correlating the complex multiple fracture mechanisms with the stress state in two microstructures. (C) 2013 Elsevier Ltd. All rights reserved.
T2  - Materials and Design
T1  - Microstructural morphology effects on fracture resistance and crack tip strain distribution in Ti-6Al-4V alloy for orthopedic implants
VL  - 53
SP  - 870
EP  - 880
DO  - 10.1016/j.matdes.2013.07.097
ER  - 

@article{
author = "Cvijović-Alagić, Ivana and Gubeljak, Nenad and Rakin, Marko P. and Cvijović, Zorica M. and Geric, K.",
year = "2014",
abstract = "The effects of microstructural morphology on the fracture behavior of Ti-6Al-4V ELI (extra-low impurity) alloy in two different heat treatment conditions were examined. Alloy was solution treated above (beta ST) and below (alpha + beta ST) beta transus temperature followed by furnace cooling (FC) in order to obtain the fully lamellar and equiaxed microstructures. Tensile and fracture toughness tests were conducted. The crack tip opening displacement (CTOD) and strain distribution near the crack tip were measured on the compact tension (CT) specimen surface by digital stereometric method. The crack propagation resistance (CTOD-R) curves were developed by applying the modified normalization method and critical CTOD values were determined. To identify the microstructural length scale controlling the fracture resistance of this alloy, the crack propagation path and fracture surface morphology were evaluated. It was found that the reduction in the characteristic microstructural dimension of an order of magnitude and significant change in the alpha phase aspect ratio contribute to drastic increase in the tensile properties and decrease in the crack initiation and propagation resistance. The fully lamellar microstructure displays slightly better biocompatibility because of the lower elastic modulus and superior fracture resistance. The enhanced crack propagation resistance of this microstructure is associated with the larger propensity for crack tip tortuousity, due to the coarser microstructural dimensions (lamellar colony size vs. primary alpha grain size). The difference in the crack propagation modes affects the shape and size of the actual crack tip strain distribution. These results were discussed correlating the complex multiple fracture mechanisms with the stress state in two microstructures. (C) 2013 Elsevier Ltd. All rights reserved.",
journal = "Materials and Design",
title = "Microstructural morphology effects on fracture resistance and crack tip strain distribution in Ti-6Al-4V alloy for orthopedic implants",
volume = "53",
pages = "870-880",
doi = "10.1016/j.matdes.2013.07.097"
}

Cvijović-Alagić, I., Gubeljak, N., Rakin, M. P., Cvijović, Z. M.,& Geric, K.. (2014). Microstructural morphology effects on fracture resistance and crack tip strain distribution in Ti-6Al-4V alloy for orthopedic implants. in Materials and Design, 53, 870-880.
https://doi.org/10.1016/j.matdes.2013.07.097

Cvijović-Alagić I, Gubeljak N, Rakin MP, Cvijović ZM, Geric K. Microstructural morphology effects on fracture resistance and crack tip strain distribution in Ti-6Al-4V alloy for orthopedic implants. in Materials and Design. 2014;53:870-880.
doi:10.1016/j.matdes.2013.07.097 .

Cvijović-Alagić, Ivana, Gubeljak, Nenad, Rakin, Marko P., Cvijović, Zorica M., Geric, K., "Microstructural morphology effects on fracture resistance and crack tip strain distribution in Ti-6Al-4V alloy for orthopedic implants" in Materials and Design, 53 (2014):870-880,
https://doi.org/10.1016/j.matdes.2013.07.097 . .

TY  - CONF
AU  - Tomić, Nataša Z.
AU  - Dimitrijević, Marija M.
AU  - Medjo, Bojan I.
AU  - Rakin, Marko P.
AU  - Jančić Heinemann, Radmila M.
AU  - Aleksić, Radovan R.
PY  - 2013
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10679
AB  - This research examined SiC sintered specimens with high hardness and strength. This material is used to protect of projectile impact for military purposes. The testing procedure consists of structure examination obtained using XRD analysis, surface examination by SEM analysis and optical microscopy, examination of mechanical properties and density determination. Analysis confirmed surface irregularities characterized using image analysis. The sample is subjected to bending. Finite element modeling was used to simulate the behavior of sample subjected to bending in presence of critical damage on surface. It is confirmed that there is correlation between the largest irregularities determined on surface and measured strength of sample. Simulations show the significance of damage size. The size of damage on surface is considered to be the critical parameter for quality determination.
C3  - 12th Young Researchers' Conference Materials Sciences and Engineering, December 11-13, 2013, Belgrade, Serbia
T1  - Comparation of mechanical behaviour of SiC sintered specimen to analysis of surface defects
SP  - 36
UR  - https://hdl.handle.net/21.15107/rcub_vinar_10679
ER  - 

@conference{
author = "Tomić, Nataša Z. and Dimitrijević, Marija M. and Medjo, Bojan I. and Rakin, Marko P. and Jančić Heinemann, Radmila M. and Aleksić, Radovan R.",
year = "2013",
abstract = "This research examined SiC sintered specimens with high hardness and strength. This material is used to protect of projectile impact for military purposes. The testing procedure consists of structure examination obtained using XRD analysis, surface examination by SEM analysis and optical microscopy, examination of mechanical properties and density determination. Analysis confirmed surface irregularities characterized using image analysis. The sample is subjected to bending. Finite element modeling was used to simulate the behavior of sample subjected to bending in presence of critical damage on surface. It is confirmed that there is correlation between the largest irregularities determined on surface and measured strength of sample. Simulations show the significance of damage size. The size of damage on surface is considered to be the critical parameter for quality determination.",
journal = "12th Young Researchers' Conference Materials Sciences and Engineering, December 11-13, 2013, Belgrade, Serbia",
title = "Comparation of mechanical behaviour of SiC sintered specimen to analysis of surface defects",
pages = "36",
url = "https://hdl.handle.net/21.15107/rcub_vinar_10679"
}

Tomić, N. Z., Dimitrijević, M. M., Medjo, B. I., Rakin, M. P., Jančić Heinemann, R. M.,& Aleksić, R. R.. (2013). Comparation of mechanical behaviour of SiC sintered specimen to analysis of surface defects. in 12th Young Researchers' Conference Materials Sciences and Engineering, December 11-13, 2013, Belgrade, Serbia, 36.
https://hdl.handle.net/21.15107/rcub_vinar_10679

Tomić NZ, Dimitrijević MM, Medjo BI, Rakin MP, Jančić Heinemann RM, Aleksić RR. Comparation of mechanical behaviour of SiC sintered specimen to analysis of surface defects. in 12th Young Researchers' Conference Materials Sciences and Engineering, December 11-13, 2013, Belgrade, Serbia. 2013;:36.
https://hdl.handle.net/21.15107/rcub_vinar_10679 .

Tomić, Nataša Z., Dimitrijević, Marija M., Medjo, Bojan I., Rakin, Marko P., Jančić Heinemann, Radmila M., Aleksić, Radovan R., "Comparation of mechanical behaviour of SiC sintered specimen to analysis of surface defects" in 12th Young Researchers' Conference Materials Sciences and Engineering, December 11-13, 2013, Belgrade, Serbia (2013):36,
https://hdl.handle.net/21.15107/rcub_vinar_10679 .

TY  - JOUR
AU  - Cvijović-Alagić, Ivana
AU  - Cvijović, Zorica M.
AU  - Mitrovic, S.
AU  - Panić, Vladimir
AU  - Rakin, Marko P.
PY  - 2011
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/4216
AB  - Wear and corrosion behaviour of cold-rolled Ti-13Nb-13Zr alloy, with martensitic microstructure, and Ti-6Al-4V ELI alloy, in martensitic and two-phase (alpha + beta) microstructural conditions, was studied in a Ringers solution. The wear experiments were performed at room temperature with a normal load of 40 N and sliding speeds 0.26. 0.5 and 1.0 m/s. The corrosion behaviour was studied at 37 degrees C using open circuit potential-time measurements and potentiodynamic polarization. It was found that Ti-13Nb-13Zr alloy has a substantially lower wear resistance than Ti-6Al-4V ELI alloy in both microstructural conditions. Surface damage extent increases with sliding speed increase and is always smallest for martensitic Ti-6Al-4V ELI alloy with highest hardness. Both alloys exhibit spontaneous passivity in Ringers solution. Corrosion potential values are similar for all three materials. However, Ti-13Nb-13Zr and martensitic Ti-6Al-4V ELI alloys show improved corrosion resistance comparatively to Ti-6Al-4V ELI alloy with (alpha + beta) microstructure. Martensitic Ti-6Al-4V ELI alloy possesses the best combination of both corrosion and wear resistance, although its corrosion resistance is found to be slightly higher than that of the Ti-13Nb-13Zr alloy. (C) 2010 Elsevier Ltd. All rights reserved.
T2  - Corrosion Science
T1  - Wear and corrosion behaviour of Ti-13Nb-13Zr and Ti-6Al-4V alloys in simulated physiological solution
VL  - 53
IS  - 2
SP  - 796
EP  - 808
DO  - 10.1016/j.corsci.2010.11.014
ER  - 

@article{
author = "Cvijović-Alagić, Ivana and Cvijović, Zorica M. and Mitrovic, S. and Panić, Vladimir and Rakin, Marko P.",
year = "2011",
abstract = "Wear and corrosion behaviour of cold-rolled Ti-13Nb-13Zr alloy, with martensitic microstructure, and Ti-6Al-4V ELI alloy, in martensitic and two-phase (alpha + beta) microstructural conditions, was studied in a Ringers solution. The wear experiments were performed at room temperature with a normal load of 40 N and sliding speeds 0.26. 0.5 and 1.0 m/s. The corrosion behaviour was studied at 37 degrees C using open circuit potential-time measurements and potentiodynamic polarization. It was found that Ti-13Nb-13Zr alloy has a substantially lower wear resistance than Ti-6Al-4V ELI alloy in both microstructural conditions. Surface damage extent increases with sliding speed increase and is always smallest for martensitic Ti-6Al-4V ELI alloy with highest hardness. Both alloys exhibit spontaneous passivity in Ringers solution. Corrosion potential values are similar for all three materials. However, Ti-13Nb-13Zr and martensitic Ti-6Al-4V ELI alloys show improved corrosion resistance comparatively to Ti-6Al-4V ELI alloy with (alpha + beta) microstructure. Martensitic Ti-6Al-4V ELI alloy possesses the best combination of both corrosion and wear resistance, although its corrosion resistance is found to be slightly higher than that of the Ti-13Nb-13Zr alloy. (C) 2010 Elsevier Ltd. All rights reserved.",
journal = "Corrosion Science",
title = "Wear and corrosion behaviour of Ti-13Nb-13Zr and Ti-6Al-4V alloys in simulated physiological solution",
volume = "53",
number = "2",
pages = "796-808",
doi = "10.1016/j.corsci.2010.11.014"
}

Cvijović-Alagić, I., Cvijović, Z. M., Mitrovic, S., Panić, V.,& Rakin, M. P.. (2011). Wear and corrosion behaviour of Ti-13Nb-13Zr and Ti-6Al-4V alloys in simulated physiological solution. in Corrosion Science, 53(2), 796-808.
https://doi.org/10.1016/j.corsci.2010.11.014

Cvijović-Alagić I, Cvijović ZM, Mitrovic S, Panić V, Rakin MP. Wear and corrosion behaviour of Ti-13Nb-13Zr and Ti-6Al-4V alloys in simulated physiological solution. in Corrosion Science. 2011;53(2):796-808.
doi:10.1016/j.corsci.2010.11.014 .

Cvijović-Alagić, Ivana, Cvijović, Zorica M., Mitrovic, S., Panić, Vladimir, Rakin, Marko P., "Wear and corrosion behaviour of Ti-13Nb-13Zr and Ti-6Al-4V alloys in simulated physiological solution" in Corrosion Science, 53, no. 2 (2011):796-808,
https://doi.org/10.1016/j.corsci.2010.11.014 . .

TY  - JOUR
AU  - Bobić, Biljana M.
AU  - Bajat, Jelena B.
AU  - Aćimović-Pavlović, Zagorka
AU  - Rakin, Marko P.
AU  - Bobić, Ilija
PY  - 2011
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/4160
AB  - The effect of heat treatment on the microstructure and corrosion behaviour of Zn27Al1 5CuO 02Mg alloy was examined The alloy was prepared by melting and casting route and then thermally processed (T4 regime) Corrosion behaviour of the as-cast and heat treated alloy was studied in 3 5 wt % NaCl solution using immersion method and electrochemical polarization measurements The applied heat treatment affected the alloy microstructure and resulted in increased ductility and higher corrosion resistance of the heat treated alloy Electrochemical measurements of the corrosion rate at the free corrosion potential are in agreement with the results obtained using the weight loss method 2010 Elsevier Ltd All rights reserved
T2  - Corrosion Science
T1  - The effect of T4 heat treatment on the microstructure and corrosion behaviour of Zn27Al1.5Cu0.02Mg alloy
VL  - 53
IS  - 1
SP  - 409
EP  - 417
DO  - 10.1016/j.corsci.2010.09.051
ER  - 

@article{
author = "Bobić, Biljana M. and Bajat, Jelena B. and Aćimović-Pavlović, Zagorka and Rakin, Marko P. and Bobić, Ilija",
year = "2011",
abstract = "The effect of heat treatment on the microstructure and corrosion behaviour of Zn27Al1 5CuO 02Mg alloy was examined The alloy was prepared by melting and casting route and then thermally processed (T4 regime) Corrosion behaviour of the as-cast and heat treated alloy was studied in 3 5 wt % NaCl solution using immersion method and electrochemical polarization measurements The applied heat treatment affected the alloy microstructure and resulted in increased ductility and higher corrosion resistance of the heat treated alloy Electrochemical measurements of the corrosion rate at the free corrosion potential are in agreement with the results obtained using the weight loss method 2010 Elsevier Ltd All rights reserved",
journal = "Corrosion Science",
title = "The effect of T4 heat treatment on the microstructure and corrosion behaviour of Zn27Al1.5Cu0.02Mg alloy",
volume = "53",
number = "1",
pages = "409-417",
doi = "10.1016/j.corsci.2010.09.051"
}

Bobić, B. M., Bajat, J. B., Aćimović-Pavlović, Z., Rakin, M. P.,& Bobić, I.. (2011). The effect of T4 heat treatment on the microstructure and corrosion behaviour of Zn27Al1.5Cu0.02Mg alloy. in Corrosion Science, 53(1), 409-417.
https://doi.org/10.1016/j.corsci.2010.09.051

Bobić BM, Bajat JB, Aćimović-Pavlović Z, Rakin MP, Bobić I. The effect of T4 heat treatment on the microstructure and corrosion behaviour of Zn27Al1.5Cu0.02Mg alloy. in Corrosion Science. 2011;53(1):409-417.
doi:10.1016/j.corsci.2010.09.051 .

Bobić, Biljana M., Bajat, Jelena B., Aćimović-Pavlović, Zagorka, Rakin, Marko P., Bobić, Ilija, "The effect of T4 heat treatment on the microstructure and corrosion behaviour of Zn27Al1.5Cu0.02Mg alloy" in Corrosion Science, 53, no. 1 (2011):409-417,
https://doi.org/10.1016/j.corsci.2010.09.051 . .

TY  - JOUR
AU  - Cvijović-Alagić, Ivana
AU  - Cvijović, Zorica M.
AU  - Mitrovic, S.
AU  - Rakin, Marko P.
AU  - Veljović, Đorđe N.
AU  - Babic, M.
PY  - 2010
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/4105
AB  - The aim of this study is to compare the tribological behaviour of novel orthopaedic implant alloy Ti-13Nb-13Zr with that of the standard Ti-6Al-4V ELI alloy, available in four different microstructural conditions produced by variations in the heat treatments. The friction and wear tests were performed by using a block-on-disc tribometer in Ringers solution at ambient temperature with a normal load of 20-60 N and sliding speed of 0.26-1.0 m/s. It was found that variations in microstructures produced significant variations in the wear resistance of Ti-6Al-4V ELI alloy. The wear losses of materials solution treated (ST) above the beta transus temperature are significantly lower compared with those of materials ST in the (alpha + beta) phase field and are almost insensitive to applied load and sliding speed. Wear loss of the (alpha + beta) ST Ti-6Al-4V ELI alloy continuously increased as applied load was increased and was highest at the highest sliding speed. The Ti-6Al-4V ELI alloy in all microstructural conditions possesses a much better wear resistance than cold-rolled Ti-13Nb-13Zr alloy. Friction results and morphology of worn surfaces showed that the observed behaviour is attributed to the predominant wear damage mechanism.
T2  - Tribology Letters
T1  - Tribological Behaviour of Orthopaedic Ti-13Nb-13Zr and Ti-6Al-4V Alloys
VL  - 40
IS  - 1
SP  - 59
EP  - 70
DO  - 10.1007/s11249-010-9639-8
ER  - 

@article{
author = "Cvijović-Alagić, Ivana and Cvijović, Zorica M. and Mitrovic, S. and Rakin, Marko P. and Veljović, Đorđe N. and Babic, M.",
year = "2010",
abstract = "The aim of this study is to compare the tribological behaviour of novel orthopaedic implant alloy Ti-13Nb-13Zr with that of the standard Ti-6Al-4V ELI alloy, available in four different microstructural conditions produced by variations in the heat treatments. The friction and wear tests were performed by using a block-on-disc tribometer in Ringers solution at ambient temperature with a normal load of 20-60 N and sliding speed of 0.26-1.0 m/s. It was found that variations in microstructures produced significant variations in the wear resistance of Ti-6Al-4V ELI alloy. The wear losses of materials solution treated (ST) above the beta transus temperature are significantly lower compared with those of materials ST in the (alpha + beta) phase field and are almost insensitive to applied load and sliding speed. Wear loss of the (alpha + beta) ST Ti-6Al-4V ELI alloy continuously increased as applied load was increased and was highest at the highest sliding speed. The Ti-6Al-4V ELI alloy in all microstructural conditions possesses a much better wear resistance than cold-rolled Ti-13Nb-13Zr alloy. Friction results and morphology of worn surfaces showed that the observed behaviour is attributed to the predominant wear damage mechanism.",
journal = "Tribology Letters",
title = "Tribological Behaviour of Orthopaedic Ti-13Nb-13Zr and Ti-6Al-4V Alloys",
volume = "40",
number = "1",
pages = "59-70",
doi = "10.1007/s11249-010-9639-8"
}

Cvijović-Alagić, I., Cvijović, Z. M., Mitrovic, S., Rakin, M. P., Veljović, Đ. N.,& Babic, M.. (2010). Tribological Behaviour of Orthopaedic Ti-13Nb-13Zr and Ti-6Al-4V Alloys. in Tribology Letters, 40(1), 59-70.
https://doi.org/10.1007/s11249-010-9639-8

Cvijović-Alagić I, Cvijović ZM, Mitrovic S, Rakin MP, Veljović ĐN, Babic M. Tribological Behaviour of Orthopaedic Ti-13Nb-13Zr and Ti-6Al-4V Alloys. in Tribology Letters. 2010;40(1):59-70.
doi:10.1007/s11249-010-9639-8 .

Cvijović-Alagić, Ivana, Cvijović, Zorica M., Mitrovic, S., Rakin, Marko P., Veljović, Đorđe N., Babic, M., "Tribological Behaviour of Orthopaedic Ti-13Nb-13Zr and Ti-6Al-4V Alloys" in Tribology Letters, 40, no. 1 (2010):59-70,
https://doi.org/10.1007/s11249-010-9639-8 . .

TY  - JOUR
AU  - Cvijović, Zorica M.
AU  - Vratnica, M.
AU  - Rakin, Marko P.
AU  - Cvijović-Alagić, Ivana
PY  - 2008
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/3590
AB  - An attempt has been made to model the plane-strain fracture toughness, KIc, in Al-Zn-Mg-Cu alloy forgings subjected to overageing. The proposed model, based on the multiple micromechanisms, reveals the quantitative relations between fracture toughness, fraction of all fracture modes and microstructural parameters associated with multiscale-sized second-phase particles and precipitate-free zones. The new model is validated by the present quantitative data of microstructural and fractographic analysis performed along with mechanical tests on hot-forged plates in T73 condition. The relevant parameters changed by the compositional variations were determined in two orientations. It was found that the predicted KIc values represent the tendency of fracture toughness change well. The new model provides better agreement for the case of dominant transgranular fracture mode.
T2  - Philosophical Magazine
T1  - Micromechanical model for fracture toughness prediction in Al-Zn-Mg-Cu alloy forgings
VL  - 88
IS  - 27
SP  - 3153
EP  - 3179
DO  - 10.1080/14786430802502559
ER  - 

@article{
author = "Cvijović, Zorica M. and Vratnica, M. and Rakin, Marko P. and Cvijović-Alagić, Ivana",
year = "2008",
abstract = "An attempt has been made to model the plane-strain fracture toughness, KIc, in Al-Zn-Mg-Cu alloy forgings subjected to overageing. The proposed model, based on the multiple micromechanisms, reveals the quantitative relations between fracture toughness, fraction of all fracture modes and microstructural parameters associated with multiscale-sized second-phase particles and precipitate-free zones. The new model is validated by the present quantitative data of microstructural and fractographic analysis performed along with mechanical tests on hot-forged plates in T73 condition. The relevant parameters changed by the compositional variations were determined in two orientations. It was found that the predicted KIc values represent the tendency of fracture toughness change well. The new model provides better agreement for the case of dominant transgranular fracture mode.",
journal = "Philosophical Magazine",
title = "Micromechanical model for fracture toughness prediction in Al-Zn-Mg-Cu alloy forgings",
volume = "88",
number = "27",
pages = "3153-3179",
doi = "10.1080/14786430802502559"
}

Cvijović, Z. M., Vratnica, M., Rakin, M. P.,& Cvijović-Alagić, I.. (2008). Micromechanical model for fracture toughness prediction in Al-Zn-Mg-Cu alloy forgings. in Philosophical Magazine, 88(27), 3153-3179.
https://doi.org/10.1080/14786430802502559

Cvijović ZM, Vratnica M, Rakin MP, Cvijović-Alagić I. Micromechanical model for fracture toughness prediction in Al-Zn-Mg-Cu alloy forgings. in Philosophical Magazine. 2008;88(27):3153-3179.
doi:10.1080/14786430802502559 .

Cvijović, Zorica M., Vratnica, M., Rakin, Marko P., Cvijović-Alagić, Ivana, "Micromechanical model for fracture toughness prediction in Al-Zn-Mg-Cu alloy forgings" in Philosophical Magazine, 88, no. 27 (2008):3153-3179,
https://doi.org/10.1080/14786430802502559 . .

TY  - JOUR
AU  - Cvijović, Zorica M.
AU  - Rakin, Marko P.
AU  - Vratnica, M.
AU  - Cvijović, Ivana
PY  - 2008
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/3389
AB  - The effects of microstructural parameters associated with the coarse intermetallic phases particles and precipitates on the fracture toughness of the overaged 7000 alloy forgings are investigated. Detailed microstructural and fractographic analysis together with fracture toughness tests are carried out using three alloys with different (Fe + Si) contents. The fracture mechanisms are identified and area fractions of different fracture modes are assessed. The data are then quantitatively correlated to plane-strain fracture toughness, K-Ic, and the bulk microstructural attributes estimated via image analysis. A multiple micromechanism-based model is developed, which accurately describes the dependence of K-Ic on individual microstructural parameters. (C) 2007 Published by Elsevier Ltd.
T2  - Engineering Fracture Mechanics
T1  - Microstructural dependence of fracture toughness in high-strength 7000 forging alloys
VL  - 75
IS  - 8
SP  - 2115
EP  - 2129
DO  - 10.1016/j.engfracmech.2007.10.010
ER  - 

@article{
author = "Cvijović, Zorica M. and Rakin, Marko P. and Vratnica, M. and Cvijović, Ivana",
year = "2008",
abstract = "The effects of microstructural parameters associated with the coarse intermetallic phases particles and precipitates on the fracture toughness of the overaged 7000 alloy forgings are investigated. Detailed microstructural and fractographic analysis together with fracture toughness tests are carried out using three alloys with different (Fe + Si) contents. The fracture mechanisms are identified and area fractions of different fracture modes are assessed. The data are then quantitatively correlated to plane-strain fracture toughness, K-Ic, and the bulk microstructural attributes estimated via image analysis. A multiple micromechanism-based model is developed, which accurately describes the dependence of K-Ic on individual microstructural parameters. (C) 2007 Published by Elsevier Ltd.",
journal = "Engineering Fracture Mechanics",
title = "Microstructural dependence of fracture toughness in high-strength 7000 forging alloys",
volume = "75",
number = "8",
pages = "2115-2129",
doi = "10.1016/j.engfracmech.2007.10.010"
}

Cvijović, Z. M., Rakin, M. P., Vratnica, M.,& Cvijović, I.. (2008). Microstructural dependence of fracture toughness in high-strength 7000 forging alloys. in Engineering Fracture Mechanics, 75(8), 2115-2129.
https://doi.org/10.1016/j.engfracmech.2007.10.010

Cvijović ZM, Rakin MP, Vratnica M, Cvijović I. Microstructural dependence of fracture toughness in high-strength 7000 forging alloys. in Engineering Fracture Mechanics. 2008;75(8):2115-2129.
doi:10.1016/j.engfracmech.2007.10.010 .

Cvijović, Zorica M., Rakin, Marko P., Vratnica, M., Cvijović, Ivana, "Microstructural dependence of fracture toughness in high-strength 7000 forging alloys" in Engineering Fracture Mechanics, 75, no. 8 (2008):2115-2129,
https://doi.org/10.1016/j.engfracmech.2007.10.010 . .

TY  - CONF
AU  - Dobrojevic, M.
AU  - Rakin, Marko P.
AU  - Gubeljak, Nenad
AU  - Cvijović, Ivana
AU  - Zrilic, M.
AU  - Krunich, N.
AU  - Sedmak, Aleksandar S.
PY  - 2007
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/6701
AB  - In this paper the micromechanical approach to ductile fracture was applied in a study of constraint effect on crack growth initiation in mismatched welded joints. The single-edged notched bend specimens (precrack length a(0)/W=0.32) were experimentally and numerically analyzed. The coupled micromechanical model proposed by Gurson, Tvergaard and Needleman was used. Constraint effect was tested by varying widths of the welded joints (6, 12 and 18mm). High-strength low-alloyed (HSLA) steel was used as the base metal in a quenched and tempered condition. The flux-cored are-welding process in shielding gas was used. Two different fillers were selected to obtain over- and undermatched weld metal. The micromechanical parameters used in prediction of the crack growth initiation on precracked specimen were calibrated on a round smooth specimen. The difference in fracture behavior between over- and undermatched welded joints obtained in experimental results was followed by numerical computations of void volume fraction in front of the crack tip.
C3  - Materials Science Forum
T1  - Micromechanical analysis of constraint effect on fracture initiation in strength mismatched welded
VL  - 555
SP  - 571
EP  - +
DO  - 10.4028/www.scientific.net/MSF.555.571
ER  - 

@conference{
author = "Dobrojevic, M. and Rakin, Marko P. and Gubeljak, Nenad and Cvijović, Ivana and Zrilic, M. and Krunich, N. and Sedmak, Aleksandar S.",
year = "2007",
abstract = "In this paper the micromechanical approach to ductile fracture was applied in a study of constraint effect on crack growth initiation in mismatched welded joints. The single-edged notched bend specimens (precrack length a(0)/W=0.32) were experimentally and numerically analyzed. The coupled micromechanical model proposed by Gurson, Tvergaard and Needleman was used. Constraint effect was tested by varying widths of the welded joints (6, 12 and 18mm). High-strength low-alloyed (HSLA) steel was used as the base metal in a quenched and tempered condition. The flux-cored are-welding process in shielding gas was used. Two different fillers were selected to obtain over- and undermatched weld metal. The micromechanical parameters used in prediction of the crack growth initiation on precracked specimen were calibrated on a round smooth specimen. The difference in fracture behavior between over- and undermatched welded joints obtained in experimental results was followed by numerical computations of void volume fraction in front of the crack tip.",
journal = "Materials Science Forum",
title = "Micromechanical analysis of constraint effect on fracture initiation in strength mismatched welded",
volume = "555",
pages = "571-+",
doi = "10.4028/www.scientific.net/MSF.555.571"
}

Dobrojevic, M., Rakin, M. P., Gubeljak, N., Cvijović, I., Zrilic, M., Krunich, N.,& Sedmak, A. S.. (2007). Micromechanical analysis of constraint effect on fracture initiation in strength mismatched welded. in Materials Science Forum, 555, 571-+.
https://doi.org/10.4028/www.scientific.net/MSF.555.571

Dobrojevic M, Rakin MP, Gubeljak N, Cvijović I, Zrilic M, Krunich N, Sedmak AS. Micromechanical analysis of constraint effect on fracture initiation in strength mismatched welded. in Materials Science Forum. 2007;555:571-+.
doi:10.4028/www.scientific.net/MSF.555.571 .

Dobrojevic, M., Rakin, Marko P., Gubeljak, Nenad, Cvijović, Ivana, Zrilic, M., Krunich, N., Sedmak, Aleksandar S., "Micromechanical analysis of constraint effect on fracture initiation in strength mismatched welded" in Materials Science Forum, 555 (2007):571-+,
https://doi.org/10.4028/www.scientific.net/MSF.555.571 . .