Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 596, Issue -, Pages 176-182Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2013.12.012
Keywords
AA7085 aluminum alloy; Hot deformation; Constitutive equation; Softening mechanism; Dynamic recrystallization
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Funding
- Chongqing Municipal Programs for Science and Technology (CSTC) [2010AA4047]
- NSFC [50901092]
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The isothermal deformation compression tests of AA7085 aluminum alloy were performed on Gleeble1500 system in the temperature range from 250 degrees C to 450 degrees C and at strain rate range from 0.01 s(-1) to 10 s(-1). The microstructure of samples was observed using optical microscopy (OM) and transmission electron microscopy (TEM) techniques. The results show that the peak stress levels decreased with the increase of deformation temperatures or the decrease of strain rate, which can be represented by the Zener-Hollomon parameter in the exponent-type equation with the hot deformation activation energy of 249.11 KJ/mol. Dynamic recrystallization more obviously occurred in the sample with higher Z value than in the sample with lower Z value. Dynamic recrystallization is sensitively dependent on the deformation temperature. (C) 2013 Elsevier B.V. All rights reserved.
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