【摘要】 通过不同应变速率和不同温度下的轴对称压缩试验,研究了AZ31B镁合金塑性变形与动态再结晶的相互依赖关系。研究证实,温度T在200℃～400℃区间、变形程度ε约0.2左右时,开始出现动态再结晶(DRX)现象。随变形程度的增加,DRX晶粒不断增多,材料呈现明显的软化趋势,流动应力下降。当DRX过程完成以后,继续变形,材料又出现硬化行为。为镁合金塑性变形组织演变的定量研究打下了基础。更多还原

【Abstract】 The relationship between the dynamic recrystallization(DRX)and plastic deformation of the magnesium alloy AZ31B by axisymmetric compressiontests at different strain rate and different temperature is investigated. Studies show that AZ31B presents dynamic recrystallization behavior at 200～400℃ in temperature and around 0.2 in strain. With deformation increased, amount of DRX grains arises, the materials presents obvious tendency of softening, and flow stress declines as well. After the completion of DRX process, the material is hardened again if deformation continues. This paper provides the foundation for the quantitative analysis of microstructure evolution of magnesium alloys during plastic deformation.更多还原