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The effect of compositional variations on the fracture toughness of 7000 al-alloys

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2008
1200.pdf (257.7Kb)
Authors
Vratnica, Maja
Cvijović, Zorica
Radović, Nenad
Article (Published version)
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Abstract
To provide an understanding of how compositional variations affect the microstructural parameters associated with coarse intermetallic (IM) particles and the fracture toughness in AA 7000 aluminum forgings, a microstructural and fractographic analysis as well as mechanical tests were carried out on three industrially produced Al-Zn-Mg-Cu alloys with different contents of impurities (Fe+Si). Light optical microscopy and image analysis were used to assess the volume fraction, size and distribution of all the soluble and insoluble coarse ( gt 0.1 mu m) IM particles identified in the corresponding R-C and L-R planes for T73-type heat treatments by selective etching and energy-dispersive X-ray spectroscopy. These quantitative data were correlated with the plain-strain fracture toughness, K-IC, with the results being, used to produce useful information on alloy design and thermomechanical processing via microstructural control. The scanning electron microscope observation of fracture surfac...e features and an estimation of the area fractions of different fracture modes in the plastic zone segments of a test specimen showed that multiple failure mechanisms occurred with coarse voiding at the intermetallics becoming more important as the fraction of coarse IM particles increases. A quantitative assessment of the relevant microstructural and fractographic parameters will be utilized for developing and verifying a multiple micromechanisms-based model for fracture toughness.

Keywords:
7000 Al-alloys / chemical composition / microstructure / fracture toughness
Source:
Materiali in Tehnologije, 2008, 42, 5, 191-196
Publisher:
  • Institute of Metals and Technology

ISSN: 1580-2949

PubMed:

WoS: 000260602200001

Scopus: 2-s2.0-84861522416
[ Google Scholar ]
2
1
Handle
https://hdl.handle.net/21.15107/rcub_technorep_1203
URI
http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1203
Collections
  • Radovi istraživača / Researchers’ publications (TMF)
Institution/Community
Tehnološko-metalurški fakultet
TY  - JOUR
AU  - Vratnica, Maja
AU  - Cvijović, Zorica
AU  - Radović, Nenad
PY  - 2008
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1203
AB  - To provide an understanding of how compositional variations affect the microstructural parameters associated with coarse intermetallic (IM) particles and the fracture toughness in AA 7000 aluminum forgings, a microstructural and fractographic analysis as well as mechanical tests were carried out on three industrially produced Al-Zn-Mg-Cu alloys with different contents of impurities (Fe+Si). Light optical microscopy and image analysis were used to assess the volume fraction, size and distribution of all the soluble and insoluble coarse ( gt  0.1 mu m) IM particles identified in the corresponding R-C and L-R planes for T73-type heat treatments by selective etching and energy-dispersive X-ray spectroscopy. These quantitative data were correlated with the plain-strain fracture toughness, K-IC, with the results being, used to produce useful information on alloy design and thermomechanical processing via microstructural control. The scanning electron microscope observation of fracture surface features and an estimation of the area fractions of different fracture modes in the plastic zone segments of a test specimen showed that multiple failure mechanisms occurred with coarse voiding at the intermetallics becoming more important as the fraction of coarse IM particles increases. A quantitative assessment of the relevant microstructural and fractographic parameters will be utilized for developing and verifying a multiple micromechanisms-based model for fracture toughness.
PB  - Institute of Metals and Technology
T2  - Materiali in Tehnologije
T1  - The effect of compositional variations on the fracture toughness of 7000 al-alloys
EP  - 196
IS  - 5
SP  - 191
VL  - 42
UR  - https://hdl.handle.net/21.15107/rcub_technorep_1203
ER  - 
@article{
author = "Vratnica, Maja and Cvijović, Zorica and Radović, Nenad",
year = "2008",
abstract = "To provide an understanding of how compositional variations affect the microstructural parameters associated with coarse intermetallic (IM) particles and the fracture toughness in AA 7000 aluminum forgings, a microstructural and fractographic analysis as well as mechanical tests were carried out on three industrially produced Al-Zn-Mg-Cu alloys with different contents of impurities (Fe+Si). Light optical microscopy and image analysis were used to assess the volume fraction, size and distribution of all the soluble and insoluble coarse ( gt  0.1 mu m) IM particles identified in the corresponding R-C and L-R planes for T73-type heat treatments by selective etching and energy-dispersive X-ray spectroscopy. These quantitative data were correlated with the plain-strain fracture toughness, K-IC, with the results being, used to produce useful information on alloy design and thermomechanical processing via microstructural control. The scanning electron microscope observation of fracture surface features and an estimation of the area fractions of different fracture modes in the plastic zone segments of a test specimen showed that multiple failure mechanisms occurred with coarse voiding at the intermetallics becoming more important as the fraction of coarse IM particles increases. A quantitative assessment of the relevant microstructural and fractographic parameters will be utilized for developing and verifying a multiple micromechanisms-based model for fracture toughness.",
publisher = "Institute of Metals and Technology",
journal = "Materiali in Tehnologije",
title = "The effect of compositional variations on the fracture toughness of 7000 al-alloys",
pages = "196-191",
number = "5",
volume = "42",
url = "https://hdl.handle.net/21.15107/rcub_technorep_1203"
}
Vratnica, M., Cvijović, Z.,& Radović, N.. (2008). The effect of compositional variations on the fracture toughness of 7000 al-alloys. in Materiali in Tehnologije
Institute of Metals and Technology., 42(5), 191-196.
https://hdl.handle.net/21.15107/rcub_technorep_1203
Vratnica M, Cvijović Z, Radović N. The effect of compositional variations on the fracture toughness of 7000 al-alloys. in Materiali in Tehnologije. 2008;42(5):191-196.
https://hdl.handle.net/21.15107/rcub_technorep_1203 .
Vratnica, Maja, Cvijović, Zorica, Radović, Nenad, "The effect of compositional variations on the fracture toughness of 7000 al-alloys" in Materiali in Tehnologije, 42, no. 5 (2008):191-196,
https://hdl.handle.net/21.15107/rcub_technorep_1203 .

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