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通过对轧制态AZ31镁合金板材进行多向预压缩,运用塑性变形的方式,产生了{1012}一次拉伸孪晶和{10 1 2}-{10 1 2}二次拉伸孪晶,并结合EBSD表征和XRD分析,对预压缩后材料的拉伸压缩实验的结果表明,预压缩对镁合金拉压不对称性的降低和强度的提高有明显效果。交叉预压缩之后,由于产生了孪生,材料组织晶粒细化,使得材料在再变形时,屈服强度和最大强度均明显增强。产生的拉伸孪晶片层可以有效地改变晶粒的取向,在一定程度上削弱了基面织构,在{1012}一次拉伸孪晶中产生了{1012}-{1012}二次拉伸孪晶,二者结合作用,改善了材料的再变形行为,从而降低了镁合金板材的拉压不对称性。
Through the multi-directional pre-compression of the rolled AZ31 magnesium alloy sheet and the plastic deformation, the {1012} primary tensile twins and the {1012} - {1012} Combined with EBSD characterization and XRD analysis, the results of tensile compression tests on the pre-compressed materials show that the pre-compression has obvious effect on reducing the tension-compression asymmetry and enhancing the strength of the magnesium alloy. After cross-precompression, due to the twin, the grain refinement of the material structure, so that the material in the re-deformation, the yield strength and maximum strength were significantly enhanced. The tensile twinning layer produced can effectively change the orientation of the grains and weaken the texture of the basal plane to a certain degree, resulting in {1012} - {1012} secondary stretching in {1012} primary tensile twinning Twins, the combination of the two, to improve the re-deformation behavior of the material, thereby reducing the magnesium alloy sheet tension and compression asymmetry.