In this work, microstructural characteristics, dynamic recrystallization and mechanical properties of the hot-rolled AZ31B were investigated. The results indicated that the different mechanisms of recrystallization are responsible for the microstructural evolution during the rolling deformation. It was found, as for the specimens with the rolling reduction of 30%, large number of twins are formed within the deformed matrix and the recrystallized grains are usually formed nearby the twins. This indicated that the mechanism of the twin-induced nucleation mainly dominates the recrystallization process of the specimens with the 30% reduction. As for the specimens with the rolling reduction of 75%, the recrystallized grains are nucleated on the bulged boundaries or within the deformed grains. This indicates that the mechanisms of the stress-induced grain boundary migration (SIBM) and the sub-grain growth mainly dominate the recrystallization process of the specimens with the reduction of 75%. The recrystallization process contributes to the grain refinement and to the improvement of mechanical properties of alloys. Eventually, the specimens with the rolling reduction of 75% obtain an excellent strength-ductility balance. The results of this work not only elaborate underlying knowledge on the correlation relationship between the recrystallization mechanisms and the mechanical properties, but provide an effective approach to optimize the microstructure-mechanical properties of alloys.

在这项工作中，研究了热轧 AZ31B 的显微组织特征、动态再结晶和机械性能。结果表明，不同的再结晶机制是轧制变形过程中显微组织演变的原因。结果发现，对于压下量为30%的试样，变形基体内形成大量孪晶，再结晶晶粒通常在孪晶附近形成。这表明孪生诱导成核的机制主要支配试样的再结晶过程，减少 30%。对于压下量为75%的试样，再结晶晶粒在凸起边界或变形晶粒内形核。这表明应力诱导晶界迁移 (SIBM) 和亚晶粒长大的机制主要主导试样的再结晶过程，减少了 75%。再结晶过程有助于细化晶粒和改善合金的机械性能。最终，压下量为 75% 的试样获得了优异的强延性平衡。这项工作的结果不仅阐述了再结晶机制与力学性能之间相关关系的基础知识，而且提供了一种优化合金微观结构-力学性能的有效方法。再结晶过程有助于细化晶粒和改善合金的机械性能。最终，压下量为 75% 的试样获得了优异的强延性平衡。这项工作的结果不仅阐述了再结晶机制与力学性能之间相关关系的基础知识，而且提供了一种优化合金微观结构-力学性能的有效方法。再结晶过程有助于细化晶粒和改善合金的机械性能。最终，压下量为 75% 的试样获得了优异的强延性平衡。这项工作的结果不仅阐述了再结晶机制与力学性能之间相关关系的基础知识，而且提供了一种优化合金微观结构-力学性能的有效方法。