The hot deformation behavior of directionally solidified Mg-4 wt.% Zn alloy was investigated by compression tests at temperatures of 150 °C ∼ 300 °C and strain rates of 0.01 s-1 ∼ 10 s-1. The results show that the flow stress is influenced by strain rate, deformation temperature and true strain. The constitutive equation of the directionally solidified alloy is determined and can be expressed as:
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