Transactions of Materials and Heat Treatment

Title：Constitutive equation of hot deformation for casting ZnAl10Cu2 alloy

Authors： WU Xiao-ping LI De-fu GUO Sheng-li XU Xiao-qing HE Jin-yu Hu Jie

Unit： Beijing General Research Institute for Non-ferrous Metals

KeyWords： ZnAl10Cu2 alloy hot deformation Kumar model hot deformation activation energy

ClassificationCode：TB331

year,vol(issue):pagenumber：2011,36(1):119-123

Abstract：

The hot deformation behavior of ZnAl10Cu2 alloy at strain rate ranging from 0.01 to 10.0 s-1 and deformation temperature ranging from 210 to 300 ℃ was studied by isothermal compression performed on a Gleeble-3500 simulated machine. The true stress-true strain curves of ZnAl10Cu2 alloy were obtained. The results show that the peak flow stress decreases with increasing temperature and increases with increasing strain rate. High temperature material constants were obtained using the hyperbolic-sine mathematics model, Q=144.161 kJ·mol-1，n=4.443，A=4.7×1012 s-1，α=0.01037MPa-1，and established the hot deformation constitutive relationship considering the effects of strain on flow stress by using modified Kumar model, the goodness of fit was 9.14%.

Funds：

十一五国家科技支撑计划（2009BAE71B03）

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