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进行变形速率可控的单向拉伸试验,研究了变形织构与滑移和孪生等协调变形机理对AZ31镁合金综合性能的影响。结果表明:在沿挤压方向拉伸过程中,变形织构使{0002}晶面Schmid因子较低,基面滑移难以开动,屈服强度高。在沿45°拉伸过程中,变形织构使柱面取向晶粒处于发生{0002}滑移的最佳位置,基面取向晶粒的棱柱面滑移也处于最佳位置,屈服强度低而延伸率高。沿横向拉伸的力学性能主要受孪晶影响,由于大量孪晶诱发裂纹,延伸率最低。试样在45°和横向拉伸时产生的大量拉伸孪晶,是出现{0002}双峰织构的诱因。
Uniaxial tensile tests with controlled rate of deformation were carried out to study the effect of deformation texture, sliding and twin deformation mechanisms on the properties of AZ31 magnesium alloy. The results show that during the drawing process, the deformation texture makes the Schmid factor of {0002} crystal plane lower, the basal plane slip difficult to start and the yield strength high. In the 45 ° stretch process, the deformation texture makes the orientation grains in the best place where the {0002} slip occurs, and the prismatic surface slip of the orientation grains in the base is also in the best position with low yield strength High elongation. The tensile properties along the transverse direction are mainly affected by the twins, and the elongation is the lowest due to the large number of twins induced cracks. The large amount of tensile twins produced by the specimens at 45 ° and transverse stretching are the causes of {0002} bimodal texture.