期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 743, 期 -, 页码 283-293出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2018.02.039
关键词
Al-Zn-Mg-Cu alloy; Hot deformation behavior; Dynamic recovery and dynamic recrystallization; Physically-based constitutive model
资金
- National Natural Science Foundation of China [51405100]
- Shandong Provincial Natural Science Foundation, China [ZR2017PA003]
- Postdoctoral Science Foundation of China [2014M551233, 2017T100237]
- Plan of Key Research and Development in Shandong Province [2017GGX202006]
- Plan of Co-Development of University in Weihai [2016DXGJMS05]
The hot deformation behavior of a high strength aluminum alloy (Al-Zn-Mg-Cu) was studied by isothermal hot compression tests performed over a range of temperatures (350-490 degrees C) and strain rates (0.001-1 s(-1)). A constitutive equation was established using experimental results to predict the flow stress of the alloy under elevated temperature. In the work hardening-dynamic recovery regime, a physically-based constitutive equation for the flow stress was obtained from the stress-dislocation relation. In the subsequent dynamic recrystallization region, the flow stress after the peak was predicted by employing the kinematics of the dynamic recrystallization in the constitutive model. The stress-strain curves of the alloy predicted by the established models were in good agreement with experimental results. The results indicate that the proposed physically-based constitutive equation can accurately predict the flow behavior of the Al-Zn-Mg-Cu alloy. (c) 2018 Elsevier B.V. All rights reserved.
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