Abstract 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-1 to 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.

中文翻译：

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WE71合金在高温平面应变压缩下的热变形行为

摘要 WE71 (Mg-7Y-1Nd-0.5Zr) 合金的热变形行为通过在 350 °C 到 500 °C 的温度范围内和应变速率从 0.01 s-1 到 10 s-1 的范围内进行的平面应变压缩试验来研究. 结果表明，WE71的热变形伴随着颗粒状的富Zr相和富含Y元素的块状相的析出。在低温高应变速率下变形时，合金的软化行为由以下因素协同决定：剪切带传播、绝热加热、孪晶形成和动态再结晶 (DRX)。在高温和高应变速率条件下，DRX是主要的软化机制，而拉伸孪晶的形成和湮灭导致在0.3左右应变处具有特殊的流动曲线特征。