中文摘要：

为了探索温度 T 和紧张的联合效果，评估\( \dot { \varepsilon }\)在 AZ31?Mg 的变丑特征上合金，机械行为和微结构进化以及表面变丑和损坏特征系统地在从 298～523 跨越的 T 在单轴的紧张下面被检验? K 和\( \dot { \varepsilon }\)从 10 ⁴到 10 ² s ¹。T 的增加或在 \ 的减少(\dot {\varepsilon }\) 在流动应力导致显著减少，在变硬，并且甚至弄软到连续紧张的出现的开始快速的紧张以后的一个压力伪高原的外观。相应地，从占优势的 twinning 和脱臼的有限数量的 AZ31?Mg 合金变换的塑料变丑模式滑倒进提高非基础滑倒并且和削弱的 twinning 的动态再结晶(DRX ) 。同时，裂开的模式也从沿着谷物边界(GB ) 并且在成双的边界(TB ) 或双胞胎的结束变成 DRX 发生了的附近的 GB。一个压力伪高原的外观，附近的大尺寸的裂缝的形成连续紧张弄软的 GB，和出现，亲密地与改进有关非基础滑倒并且 DRX。

英文摘要：

Abstract To explore the coupled effect of temperature T and strain rate ε on the deformation features of AZ31 Mg alloy, mechanical behaviors and microstructural evolutions as well as surface deformation and damage features were system- atically examined under uniaxial tension at T spanning from 298 to 523 K and ε from 10^-4 to 10^-2 s-1. The increase in T or the decrease in ε leads to the marked decrease in flow stress, the appearance of a stress quasi-plateau after an initially rapid strain hardening, and even to the occurrence of successive strain softening. Correspondingly, the plastic deformation modes of AZ31 Mg alloy transform from the predominant twinning and a limited amount of dislocation slip into the enhanced non-basal slip and the dynamic recrystallization （DRX） together with the weakened twinning. Meanwhile, the cracking modes also change from along grain boundaries （GBs） and at twin boundaries （TBs） or the end of twins into nearby GBs where the DRX has occurred. The appearance of a stress quasi-plateau, the formation of large-sized cracks nearby GBs, and the occurrence of continuous strain softening, are intimately related to the enhancement of the non-basal slip and the DRX.