Deformation behavior of an Al–Cu–Mg–Mn–Zr alloy during hot compression |
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| Authors: | Yao Li Zhiyi Liu Lianghua Lin Jiangtao Peng Ailin Ning |
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| Affiliation: | (1) Key Laboratory of Nonferrous Metal Materials Science and Engineering, Ministry of Education, Central South University, Changsha, 410083, China;(2) School of Materials Science and Engineering, Central South University, Changsha, 410083, China;(3) Department of Mechanical and Energy Engineering, Shaoyang University, Shaoyang, 422004, China; |
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| Abstract: | Deformation behavior of an Al–Cu–Mg–Mn–Zr alloy during hot compression was characterized in present work by high-temperature
testing and transmission electron microscope (TEM) studies. The true stress–true strain curves exhibited a peak stress at
a critical stain. The peak stress decreased with increasing deformation temperature and decreasing strain rate, which can
be described by Zener–Hollomon (Z) parameter in hyperbolic sine function with the deformation activation energy 277.8 kJ/mol. The processing map revealed the
existence of an optimum hot-working regime between 390 and 420 °C, under strain rates ranging from 0.1 to 1 s−1. The main softening mechanism of the alloy was dynamic recovery at high lnZ value; continuous dynamic recrystallization (DRX) occurred as deformed at low lnZ value. The dynamic precipitation of Al3Zr and Al20Cu2Mn3 dispersoids during hot deformation restrained DRX and increased the hot deformation activation energy of the alloy. |
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