TY  - JOUR
AU  - Cvijović, Zorica M.
AU  - Vratnica, M.
AU  - Cvijović-Alagić, Ivana
PY  - 2011
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5635
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
EP  - 193
IS  - 2
SP  - 179
VL  - 20
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",
pages = "193-179",
number = "2",
volume = "20",
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  - Vratnica, M.
AU  - Pluvinage, G.
AU  - Jodin, P.
AU  - Cvijović, Zorica
AU  - Rakin, M.
AU  - Burzić, Z.
PY  - 2010
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5602
AB  - The influence of notch radius on the fracture behavior of two high-strength Al-Zn-Mg-Cu alloys with different Fe content in the T73 condition was investigated. The fracture toughness tests were performed on non-fatigue-precracked notched bending specimens with different notch radii ranged from 0.15 mm to 1.0 mm. The obtained data were interpreted using the concept of Notch Fracture Mechanics combined with finite-element method (FEM) calculations. It was found that both alloys are very sensitive to the notch radius. The fracture toughness increases with increasing notch radius. For a given notch radii, the increase in fracture toughness is more significant for the more pure alloy. The fracture behavior of investigated alloys with respect to microstructural features and their relation with the fracture micromechanisms were analyzed.
PB  - Elsevier
T2  - Materials and Design
T1  - Influence of notch radius and microstructure on the fracture behavior of Al-Zn-Mg-Cu alloys of different purity
EP  - 1798
IS  - 4
SP  - 1790
VL  - 31
DO  - 10.1016/j.matdes.2009.11.018
ER  - 

@article{
author = "Vratnica, M. and Pluvinage, G. and Jodin, P. and Cvijović, Zorica and Rakin, M. and Burzić, Z.",
year = "2010",
abstract = "The influence of notch radius on the fracture behavior of two high-strength Al-Zn-Mg-Cu alloys with different Fe content in the T73 condition was investigated. The fracture toughness tests were performed on non-fatigue-precracked notched bending specimens with different notch radii ranged from 0.15 mm to 1.0 mm. The obtained data were interpreted using the concept of Notch Fracture Mechanics combined with finite-element method (FEM) calculations. It was found that both alloys are very sensitive to the notch radius. The fracture toughness increases with increasing notch radius. For a given notch radii, the increase in fracture toughness is more significant for the more pure alloy. The fracture behavior of investigated alloys with respect to microstructural features and their relation with the fracture micromechanisms were analyzed.",
publisher = "Elsevier",
journal = "Materials and Design",
title = "Influence of notch radius and microstructure on the fracture behavior of Al-Zn-Mg-Cu alloys of different purity",
pages = "1798-1790",
number = "4",
volume = "31",
doi = "10.1016/j.matdes.2009.11.018"
}

Vratnica, M., Pluvinage, G., Jodin, P., Cvijović, Z., Rakin, M.,& Burzić, Z.. (2010). Influence of notch radius and microstructure on the fracture behavior of Al-Zn-Mg-Cu alloys of different purity. in Materials and Design
Elsevier., 31(4), 1790-1798.
https://doi.org/10.1016/j.matdes.2009.11.018

Vratnica M, Pluvinage G, Jodin P, Cvijović Z, Rakin M, Burzić Z. Influence of notch radius and microstructure on the fracture behavior of Al-Zn-Mg-Cu alloys of different purity. in Materials and Design. 2010;31(4):1790-1798.
doi:10.1016/j.matdes.2009.11.018 .

Vratnica, M., Pluvinage, G., Jodin, P., Cvijović, Zorica, Rakin, M., Burzić, Z., "Influence of notch radius and microstructure on the fracture behavior of Al-Zn-Mg-Cu alloys of different purity" in Materials and Design, 31, no. 4 (2010):1790-1798,
https://doi.org/10.1016/j.matdes.2009.11.018 . .