Hot deformation behaviors of WE71 alloy under plain strain compression at elevated temperature

作     者：Bangqi Yin Xiangyi Xue Bin Tang Yi Wang Hongchao Kou Jinshan Li 

作者机构：State Key Laboratory of Solidification Processing Northwestern Polytechnical University 

出 版 物：《Progress in Natural Science:Materials International》 (自然科学进展·国际材料(英文))

年 卷 期：2020年第30卷第4期

页      面：526-532页

核心收录：

学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：financially supported by the Natural Science Foundation of Shaanxi Province (2018JM5174) the Research Fund of the State Key Laboratory of Solidification Processing, NPU), China (Grant No. 2019-TS-07) 

主　　题：WE71 alloy Hot deformation behavior Dynamic recrystallization Shear band Plain strain compression 

摘      要：Hot deformation behaviors of WE71（Mg–7Y-1Nd-0.5Zr） alloy was investigated by plain strain compression tests conducted at temperatures ranging from 350 °C to 500 °C and strain rates varying from 0.01 s-1to 10 s-1. Results show that the hot deformation of WE71 was accompanied by the precipitation of rich Zr phase with granular shape and block-shaped phase rich in element Y. When deformed at low temperature and high strain rate, the softening behavior of the alloy was synergically determined by shear bands propagation, adiabatic heating,twinning formation and dynamic recrystallization（DRX）. For the conditions of high temperature and high strain rate, DRX was the major softening mechanism while the formation and annihilation of extension twinning resulted in a special flow curve characteristic at the strain of around 0.3. According to the microstructural observations, it can be concluded that the irregular flow curves of WE71 alloy during plain strain compression process are mainly ascribed to shear bands propagation, adiabatic heating, twinning formation and DRX.