中文摘要：

概述了镁合金的塑性变形机制，介绍了镁合金的主要孪生系及其表征技术，详细分析了变形温度、变形速率、受力方向和晶粒尺寸等对镁合金孪生变形的影响，讨论了孪生变形对镁合金塑性变形、动态再结晶、力学性能与断裂的影响。孪生通常发生在粗大晶粒中，晶粒细化可以激活镁合金中的非基面滑移，抑制孪生变形和降低镁合金的各向异性，指出细晶镁合金的研制和工业化生产是变形镁合金发展的重要方向。

英文摘要：

The plastic deformation mechanisms are reviewed. The two typical deformation twin moaes for magnesium alloys and their analysis technologies are described. The influences of temperature, strain rate, stress and grain size on twinning are analyzed. The influences of twinning on plastic deformation, dynamic recrystallization, mechanical properties and fracture are discussed. Twinning usually occurs in coarse grains. Therefore, it is suggested that non-basal slips be activated for fine-grained Mg alloys, resulting in suppression of twin generation and reduction in mechanical anisotropy. Grain refinement is a promising direction for wrought magnesium alloys and their industrial application.