TY  - JOUR
AU  - Cvijović, Zorica M.
AU  - Vratnica, M.
AU  - Cvijović-Alagić, Ivana
PY  - 2011
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/4247
AB  - The article deals with the relations between microstructural parameters, microscopic fracture mechanisms, and resultant plane-strain fracture toughness, K(IC), of hot-forged 7000 alloy plates in overaged condition. Three industrially produced alloys with the (Zn + Mg + Cu) content of similar to 11.5 mass% and different contents of (Fe + Si) impurities (from 0.23 to 0.37 mass%) were used. The variation in alloy purity generated differences in the geometric characteristics of coarse intermetallic phase particles, exerting significant effect on fracture behavior of these alloys. To evaluate the fracture mechanism, characterization of the broken K(IC) test specimen surfaces was performed using scanning electron microscopy. Three micromechanisms governing fracture process were identified. The extent of primary voiding at coarse intermetallic phase particles increases systematically with the increase of (Fe + Si) level, whereas the extent of intergranular/transgranular fracture decreases. This observation was confirmed by a quantitative description of fractures by means of a profilometric method. It was found that morphological parameters of the fracture profiles clearly differentiate between different fracture modes and offer conclusive proof that coarse voiding at fractured intermetallic phase particles dominates fracture at low alloy purity. A higher fraction of coarse voiding is shown to result in an overall reduction of fracture toughness.
T2  - International Journal of Damage Mechanics
T1  - Effect of Alloy Purity on Fracture Behavior of Overaged 7000 Alloy Plates
VL  - 20
IS  - 2
SP  - 179
EP  - 193
DO  - 10.1177/1056789509346684
ER  - 

@article{
author = "Cvijović, Zorica M. and Vratnica, M. and Cvijović-Alagić, Ivana",
year = "2011",
abstract = "The article deals with the relations between microstructural parameters, microscopic fracture mechanisms, and resultant plane-strain fracture toughness, K(IC), of hot-forged 7000 alloy plates in overaged condition. Three industrially produced alloys with the (Zn + Mg + Cu) content of similar to 11.5 mass% and different contents of (Fe + Si) impurities (from 0.23 to 0.37 mass%) were used. The variation in alloy purity generated differences in the geometric characteristics of coarse intermetallic phase particles, exerting significant effect on fracture behavior of these alloys. To evaluate the fracture mechanism, characterization of the broken K(IC) test specimen surfaces was performed using scanning electron microscopy. Three micromechanisms governing fracture process were identified. The extent of primary voiding at coarse intermetallic phase particles increases systematically with the increase of (Fe + Si) level, whereas the extent of intergranular/transgranular fracture decreases. This observation was confirmed by a quantitative description of fractures by means of a profilometric method. It was found that morphological parameters of the fracture profiles clearly differentiate between different fracture modes and offer conclusive proof that coarse voiding at fractured intermetallic phase particles dominates fracture at low alloy purity. A higher fraction of coarse voiding is shown to result in an overall reduction of fracture toughness.",
journal = "International Journal of Damage Mechanics",
title = "Effect of Alloy Purity on Fracture Behavior of Overaged 7000 Alloy Plates",
volume = "20",
number = "2",
pages = "179-193",
doi = "10.1177/1056789509346684"
}

Cvijović, Z. M., Vratnica, M.,& Cvijović-Alagić, I.. (2011). Effect of Alloy Purity on Fracture Behavior of Overaged 7000 Alloy Plates. in International Journal of Damage Mechanics, 20(2), 179-193.
https://doi.org/10.1177/1056789509346684

Cvijović ZM, Vratnica M, Cvijović-Alagić I. Effect of Alloy Purity on Fracture Behavior of Overaged 7000 Alloy Plates. in International Journal of Damage Mechanics. 2011;20(2):179-193.
doi:10.1177/1056789509346684 .

Cvijović, Zorica M., Vratnica, M., Cvijović-Alagić, Ivana, "Effect of Alloy Purity on Fracture Behavior of Overaged 7000 Alloy Plates" in International Journal of Damage Mechanics, 20, no. 2 (2011):179-193,
https://doi.org/10.1177/1056789509346684 . .

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  - CONF
AU  - Cvijović, Zorica M.
AU  - Vratnica, M.
AU  - Cvijović-Alagić, Ivana
PY  - 2009
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/6865
AB  - To identify the most important parameters of multiscale microstructural features influencing the fracture modes and resistance to damage, detailed microstructural and fractographic analysis of overaged 7000 alloy plates are performed using the broken plane-strain fracture toughness, K-Ic, test specimens. The geometric characteristics of differently sized second-phase particles are changed by the compositional variations. It was found that the fracture process involves three main micromechanisms. The dominant fracture mode changes with alloy purity, leading to fracture toughness degradation. Quantitative description of fractures by profilometry confirmed that crack initiation and propagation is fostered by the coarse Fe- and Si-rich particles. (C) 2009 Elsevier B. V. All rights reserved
C3  - Procedia Engineering
T1  - The influences of multiscale-sized second-phase particles on fracture behaviour of overaged 7000 alloys
VL  - 1
IS  - 1
SP  - 35
EP  - 38
DO  - 10.1016/j.proeng.2009.06.010
ER  - 

@conference{
author = "Cvijović, Zorica M. and Vratnica, M. and Cvijović-Alagić, Ivana",
year = "2009",
abstract = "To identify the most important parameters of multiscale microstructural features influencing the fracture modes and resistance to damage, detailed microstructural and fractographic analysis of overaged 7000 alloy plates are performed using the broken plane-strain fracture toughness, K-Ic, test specimens. The geometric characteristics of differently sized second-phase particles are changed by the compositional variations. It was found that the fracture process involves three main micromechanisms. The dominant fracture mode changes with alloy purity, leading to fracture toughness degradation. Quantitative description of fractures by profilometry confirmed that crack initiation and propagation is fostered by the coarse Fe- and Si-rich particles. (C) 2009 Elsevier B. V. All rights reserved",
journal = "Procedia Engineering",
title = "The influences of multiscale-sized second-phase particles on fracture behaviour of overaged 7000 alloys",
volume = "1",
number = "1",
pages = "35-38",
doi = "10.1016/j.proeng.2009.06.010"
}

Cvijović, Z. M., Vratnica, M.,& Cvijović-Alagić, I.. (2009). The influences of multiscale-sized second-phase particles on fracture behaviour of overaged 7000 alloys. in Procedia Engineering, 1(1), 35-38.
https://doi.org/10.1016/j.proeng.2009.06.010

Cvijović ZM, Vratnica M, Cvijović-Alagić I. The influences of multiscale-sized second-phase particles on fracture behaviour of overaged 7000 alloys. in Procedia Engineering. 2009;1(1):35-38.
doi:10.1016/j.proeng.2009.06.010 .

Cvijović, Zorica M., Vratnica, M., Cvijović-Alagić, Ivana, "The influences of multiscale-sized second-phase particles on fracture behaviour of overaged 7000 alloys" in Procedia Engineering, 1, no. 1 (2009):35-38,
https://doi.org/10.1016/j.proeng.2009.06.010 . .

TY  - JOUR
AU  - Cvijović-Alagić, Ivana
AU  - Spiegel, M.
AU  - Parezanović, I.
PY  - 2008
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/3607
AB  - Degradation of Ti-stabilized interstitial free steel and damage of this steel caused by selective oxidation during 60 s of recrystallization annealing at 820 degrees C under the different compositions of protective H(2)-N(2) atmosphere at low dew point (-40 degrees C) was investigated using X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM) and energy dispersive spectrometry (EDS). During the high-temperature annealing the reduction of the native Fe-oxide layer occurred. Results of the analyses also showed that Mn, Al and Si oxide particles are the main products of selective external and internal oxidation. Moreover, appearance of greater nonwetted surface areas was caused by the increase of the H(2) content in gas atmosphere, which favours external oxidation.
T2  - Kovove Materialy = Metallic Materials
T1  - Damage of Ti-stabilized interstitial free steel by gas corrosion
VL  - 46
IS  - 5
SP  - 297
EP  - 300
UR  - https://hdl.handle.net/21.15107/rcub_vinar_3607
ER  - 

@article{
author = "Cvijović-Alagić, Ivana and Spiegel, M. and Parezanović, I.",
year = "2008",
abstract = "Degradation of Ti-stabilized interstitial free steel and damage of this steel caused by selective oxidation during 60 s of recrystallization annealing at 820 degrees C under the different compositions of protective H(2)-N(2) atmosphere at low dew point (-40 degrees C) was investigated using X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM) and energy dispersive spectrometry (EDS). During the high-temperature annealing the reduction of the native Fe-oxide layer occurred. Results of the analyses also showed that Mn, Al and Si oxide particles are the main products of selective external and internal oxidation. Moreover, appearance of greater nonwetted surface areas was caused by the increase of the H(2) content in gas atmosphere, which favours external oxidation.",
journal = "Kovove Materialy = Metallic Materials",
title = "Damage of Ti-stabilized interstitial free steel by gas corrosion",
volume = "46",
number = "5",
pages = "297-300",
url = "https://hdl.handle.net/21.15107/rcub_vinar_3607"
}

Cvijović-Alagić, I., Spiegel, M.,& Parezanović, I.. (2008). Damage of Ti-stabilized interstitial free steel by gas corrosion. in Kovove Materialy = Metallic Materials, 46(5), 297-300.
https://hdl.handle.net/21.15107/rcub_vinar_3607

Cvijović-Alagić I, Spiegel M, Parezanović I. Damage of Ti-stabilized interstitial free steel by gas corrosion. in Kovove Materialy = Metallic Materials. 2008;46(5):297-300.
https://hdl.handle.net/21.15107/rcub_vinar_3607 .

Cvijović-Alagić, Ivana, Spiegel, M., Parezanović, I., "Damage of Ti-stabilized interstitial free steel by gas corrosion" in Kovove Materialy = Metallic Materials, 46, no. 5 (2008):297-300,
https://hdl.handle.net/21.15107/rcub_vinar_3607 .