Flow behavior and microstructural evolution of Al–Cu–Mg–Ag alloy during hot compression deformation |
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Authors: | Xiao Yan Liu Qing Lin Pan Yun Bin He Wen Bin Li Wen Jie Liang Zhi Min Yin |
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Affiliation: | aSchool of Materials Science and Engineering, Central South University, Changsha 410083, China |
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Abstract: | The flow behavior of Al–Cu–Mg–Ag alloy and its microstructural evolution during hot compression deformation were studied by thermal simulation test. The flow stress increased with increasing the strain rate, and decreased with increasing the deforming temperature, which can be described by a constitutive equation in hyperbolic sine function with the hot deformation activation energy 196.27 kJ/mol, and can also be described by a Zener–Hollomon parameter. The dynamic recrystallization only occurred at low Z values, which must be below or equal to a constant of 5.31 × 1013 s−1. With decreasing Z value, the elongated grains coarsed and the tendency of dynamic recrystallization enhanced. Correspondingly, the subgrain size increased and the dislocation density decreased. And the main soften mechanism of the alloy transformed from dynamic recovery to dynamic recrystallization. |
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Keywords: | Al– Cu– Mg– Ag alloy Hot deformation Flow stress Deformation microstructure |
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