Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 571, Issue -, Pages 83-91Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2013.01.080
Keywords
AA7150 aluminum alloy; Hot compression deformation; Microstructure; Constitutive equation; Activation energy
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Funding
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- Rio Tinto Alcan through the NSERC Industrial Research Chair in Metallurgy of Aluminium Transformation at the University of Quebec at Chicoutimi
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The hot deformation behavior of a homogenized AA7150 aluminum alloy was studied in compression tests conducted at various temperatures (573-723 K) and strain rates (0.001-10 s(-1)). The flow stress behavior and microstructural evolution were observed during the hot deformation process. A revised Sellars' constitutive equation was proposed, which considered the effects of the deformation temperature and strain rate on the material variables and which provided an accurate estimate of the hot deformation behavior of the AA7150 aluminum alloy. The results revealed that the activation energy for the hot deformation of the AA7150 aluminum alloy is not a constant value but rather varies as a function of the deformation conditions. The activation energy for hot deformation decreased with increasing deformation temperature and strain rate. The peak flow stresses under various deformation conditions were predicted by a revised constitutive equation and correlated with the experimental data with excellent accuracy. (C) 2013 Elsevier B.V. All rights reserved.
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