Abstract Profuse extension twins were successfully introduced to the whole stir zone of friction stir welded AZ31 alloy, and the joint turned out to be a two-layered structure after an additional pass of friction stir processing with a different tool under appropriate parameters. The detailed twinning characteristics and resultant texture evolution in various regions were then investigated. The strengthening effect of twin lamellae and the weakened strain localization in deformation gave rise to a significant improvement of joint mechanical properties. The yield strength of the joint was raised from 96 MPa to 122 MPa and the tensile strength was enhanced to be roughly equal to that of the base material with no reduction of elongation.

中文翻译：

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一种通过附加搅拌摩擦加工提高镁合金接头性能的方法

摘要 大量拉伸孪晶成功地引入到搅拌摩擦焊AZ31合金的整个搅拌区，在适当的参数下用不同的工具进行额外的搅拌摩擦加工后，接头变成了两层结构。然后研究了各个区域的详细孪生特征和由此产生的纹理演变。双薄片的强化作用和变形中应变局部化的减弱导致接头力学性能的显着改善。接头的屈服强度从 96 MPa 提高到 122 MPa，拉伸强度提高到与母材大致相当，伸长率没有降低。