Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 542, Issue -, Pages 79-87Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2012.02.035
Keywords
7050 aluminum alloy; High temperature deformation; Flow stress; Microstructure; Constitutive equations
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The flow behavior of 7050 aluminum alloy was investigated by means of isothermal compression tests. Isothermal compression of 7050 aluminum alloy was carried out on a Gleeble-1500 thermal simulation machine at the deformation temperatures ranging from 593 K to 743 K. the strain rates ranging from 0.01 s(-1) to 20.0 s(-1), and the height reductions of 30%, 50% and 70%. The characteristics of stress-strain curves are determined by the interaction of work hardening, dynamic recovery and dynamic recrystallization. The flow stress decreases with the increasing of deformation temperature and the decreasing of strain rate. The relationship between microstructure and processing parameters was analyzed. The constitutive equations for characterizing the flow behavior during the whole deformation process had been established, based on the experimental results and the kinetic analysis. The average relative error between the calculated and the experimental flow stress is 5.73%, which indicates that the constitutive equations can be used to predict the flow behavior of 7050 aluminum alloy accurately during high temperature deformation. (C) 2012 Elsevier B.V. All rights reserved.
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