High temperature tensile flow constitutive equation of Mg-4Zn-2Y alloy

doi:10.13251/j.issn.0254-6051.2022.08.003

Abstract

Abstract: By conducting high temperature tensile experiments on as-rolled Mg-4Zn-2Y alloy at different thermal deformation temperatures and strain rates, the flow stress changes of the Mg-4Zn-2Y alloy during thermal deformation under different process parameters were studied. And a processing map was drawn. The results show that the flow stress is related to the deformation temperature and strain rate. When the thermal deformation temperature is constant, the maximum flow stress of the alloy increases with the increase of strain rate. When the strain rate is constant, the maximum flow stress decreases as the deformation temperature increases. The deformation activation energy and stress index for the as-rolled Mg-4Zn-2Y alloy determined by using the hyperbolic sine modified constitutive model are Q=242 233.2 J·mol^-1 and n=8.09, respectively. The suitable hot working zones of the Mg-4Zn-2Y alloy determined by the processing map are 472.15-545.00 K, 10^-3-10^-4 s^-1 and 545.00-672.15 K, 10^-4-10^-1 s^-1.

Key words: Mg-4Zn-2Y alloy, high temperature tension, flow behavior, constitutive equation

CLC Number:

TG146.4

Zhai Chuantian, Sun Youping, Li Wangzhen, He Jiangmei, Yang Chunyang. High temperature tensile flow constitutive equation of Mg-4Zn-2Y alloy[J]. Heat Treatment of Metals, 2022, 47(8): 16-23.

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