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采用光学显微镜和XRD宏观织构分析,研究了具有不同初始织构的AZ31镁合金在中温热模拟压缩变形中组织和织构的演变行为。结果表明:以柱面织构为主的试样较基面织构试样有更好的变形能力,其塑性在210~230℃温度区间内显著改善,取决于柱面滑移能协调样品应变;压缩过程中由于主要变形机制由{1012}孪生转变为柱面滑移,基面组分先增强后减弱,柱面组分先减小后增强;以基面织构为主的试样脆韧转变发生在230~250℃,取决于滑移启动和DRX;压缩过程中基面组分减弱,柱面组分增强。温度升高促进非基面滑移系和DRX的激活,使初始织构的影响减弱。
The microstructures and texture evolution of AZ31 magnesium alloy with different initial texture during mid-temperature simulated thermal deformation were investigated by optical microscopy and XRD macro-texture analysis. The results show that the specimens mainly composed of cylindrical texture have better deformability than the basal texture specimens, and their plasticity is significantly improved in the temperature range of 210-230 ° C, depending on the cylinder surface slip energy In the process of compressing, the main deformation mechanism is changed from {1012} twin to cylinder slip, the base component first increases and then decreases, and the cylinder component first decreases and then increases. The basal plane texture is dominant Brittle-to-ductile transformation of the sample occurs at 230-250 ° C, depending on slippage start-up and DRX; during the compression process, the base component decreases and the cylinder component increases. Increasing temperature promotes the activation of non-basal slip system and DRX, weakening the effect of initial texture.