Deformation behavior and microstructural evolution of Al-Zn-Cu-Mg-Sc-Zr alloy during high temperature compression |
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| Authors: | Wen-bin Li Qing-lin Pan Jun-sheng Liu Wen-jie Liang Yun-bin He and Xiao-yan Liu |
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| Affiliation: | (1) School of Materials Science and Engineering, Central South University, Changsha, 410083, China;(2) Department of Civil Engineering, Hunan City University, Yiyang, 413000, China |
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| Abstract: | The deformation behavior of a new Al-Zn-Cu-Mg-Sc-Zr alloy was investigated with compression tests in temperature range of
380–470 °C and strain rate range of 0.001–10 s−1 using Gleeble 1500 system, and the associated microstructural evolutions were studied by metallographic microscopy and transmission
electron microscopy. The results show that true stress—strain curves exhibit a peak stress, followed by a dynamic flow softening
at low strains (ɛ<0.05). The stress decreases with increasing deformation temperature and decreasing strain rate, which can be represented
by a Zener-Hollomon exponential equation with the activation energy for deformation of 157.9 kJ/mol. The substructure in the
deformed specimens consists of few fine precipitates with equaixed polygonized subgrains in the elongated grains and developed
serrations at the grain boundaries. The dynamic flow softening is attributed mainly to dynamic recovery and dynamic recrystallization.
Foundation item: Project(2006AA03Z523) supported by the National High-Tech Research and Development Program of China |
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| Keywords: | Al-Zn-Cu-Mg-Sc-Zr alloy hot deformation flow softening microstructural evolution activation energy |
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