A series of electron backscattered diffraction (EBSD) experiments is carried out to explore nucleation features in the continuous dynamic recrystallization (CDRX) of AZ31 Mg alloy sheets at 200 °C. The CDRX mechanism that misorientation accumulated from the core area to grain boundary leads to nucleation of dynamic recrystallization grains around parent grains can be identified for the present fine-grained AZ31B Mg alloy rolling sheet. A crystal plasticity approach for DRX simulation is extended to simulate the hot deformation and CDRX of the AZ31B magnesium alloy sheets. The experimental results of uniaxial tension along rolling direction (RD) and compression tests along RD and normal direction of the AZ31B sheets at 200 °C are numerically investigated by the current model in terms of mechanical behaviors, grains’ rotation, textures orientation and grain size evolution. The VPSC-DRX model that considers multiple slip systems and indirectly incorporates the misorientation can reproduce well the stress-strain curves, r-values, grain size change and texture evolution. The introduction of DRX will change the slip mode activities at 200 °C. The VPSC-DRX model can better predict the texture evolution compared to the simulation results regardless of DRX effects.

进行了一系列电子背散射衍射（EBSD）实验，以探索AZ31 Mg合金薄板在200°C下连续动态重结晶（CDRX）时的形核特征。对于当前的AZ31B镁合金细轧板，可以识别出CDRX机理，即从芯区到晶界积累的取向不良导致母体晶粒周围动态再结晶晶粒成核。扩展了用于DRX模拟的晶体可塑性方法，以模拟AZ31B镁合金薄板的热变形和CDRX。利用电流模型，从力学性能，晶粒旋转，晶粒尺寸，旋转角度等方面对200℃下AZ31B板材沿轧制方向（RD）的单轴拉伸和沿RD和法线方向的压缩试验进行了实验研究。纹理取向和晶粒尺寸的演变。VPSC-DRX模型考虑了多个滑移系统，并间接地包含了取向错误，可以很好地重现应力-应变曲线，r值，晶粒尺寸变化和织构演变。DRX的引入将改变200°C时的滑差模式活动。不管DRX效果如何，与仿真结果相比，VPSC-DRX模型都可以更好地预测纹理演变。