Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 670, Issue -, Pages 81-89Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2016.05.113
Keywords
7075 aluminum alloy; Plastic deformation; High temperature forming; Rate sensitivity; Cold work; Fracture morphology
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Funding
- Marie Curie Career Integration Grant within the EU-FP7 programme [304150]
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In the present study, elevated temperature deformation behavior and microstructural evolution of 7075 aluminum alloy at annealed and cold rolled conditions were examined. Isothermal uniaxial tensile tests at a temperature range of 200-350 degrees C and at a strain rate range of 0.001-0.1 s(-1) were conducted to investigate the effects of deformation parameters on the mechanical behavior. High temperature flow was noticeably strain rate sensitive especially for the rolled condition. Cold work was shown to have a remarkable influence on increasing the peak stress up to 250 degrees C. At and above this temperature the rolled microstructure enabled higher ductility reaching over 50% accompanied by a stress plateau. The ductility drop at 350 degrees C at the slowest deformation rate was attributed to impurity rich regions with possible formation of secondary phases due to dynamic precipitation. (C) 2016 Elsevier B.V. All rights reserved.
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