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对AZ31镁合金轧制板材进行RD-ND-RD-ND(RD-rolling direction,轧向;ND-normal direction,法向)的变路径压缩实验,研究了变形过程中的力学性能,并采用EBSD技术跟踪了上述变形过程中晶粒取向变化,分析了孪晶变体的启动情况。结果表明,在变路径压缩过程中,依次对应{10 12}拉伸孪晶-{10 12}解孪晶-{10 12}拉伸孪晶-{10 12}解孪晶的微观变形机制。首次解孪晶使屈服强度下降明显,而后续的孪晶和解孪晶过程的屈服强度都增加,且两者差值很小。解孪晶过程中孪晶变体的启动遵循Schmid定律,但出现明显的选择性,解孪晶过程都由t3或t4变体完成。
The variable path compression experiments of RD-ND-RD-ND (rolling direction; ND-normal direction) of AZ31 magnesium alloy rolled sheet were carried out. The mechanical properties of the AZ31 magnesium alloy rolled sheet during deformation were studied. EBSD The technique tracks the grain orientation changes during the above deformation process and analyzes the start-up of twin variants. The results show that in the process of variable path compression, the microscopic deformation mechanism of {Twist - {10 12} untwisted - {10 12} stretched twins {10 12} untwisted crystals is {10 12}. The first de-twinning reduces the yield strength significantly, while the yield strength of the twinning and twinning processes after the subsequent twinning increase, and the difference between the two is small. The onset of twin variants in the deconjugation follows Schmid’s law, but with obvious selectivity, de-twinning processes are all performed by t3 or t4 variants.