AZ31镁合金室温拉伸微观变形机制EBSD原位跟踪研究

利用电子背散射衍射(EBSD)技术,原位跟踪AZ31镁合金轧制板材室温下沿轧向拉伸时的晶粒取向变化。对变形过程的滑移系和孪晶启动机进行分析。结果表明:变形过程主要由〈a〉基面和柱面滑移系开动而实现,晶粒取向无明显变化,大量〈a〉位错滑移的产生,使得变形后小角度晶界增加明显。晶粒中拉伸孪晶是试样在拉伸变形过程中产生的,而非在试样拉伸后的卸载过程中产生。

Deformation Micro-mechanism of AZ31 Mg Alloy During Tension at Room Temperature by EBSD In-situ Tracking

In-situ tracking on grain orientation evolution of AZ31 Mg alloy rolled sheet during tension along rolling direction at room temperature was conducted by the electron backscatter diffraction tech-nique,and activations of slip systems and twinning during former deformation were analyzed.Analy-sis results show that,former deformation is accomplished mainly by 〈a〉basal and prismatic slip acti-vations,and there are not obvious changes for grain orientation,numerous 〈a〉dislocation slip activa-tions obviously increase the percentage of low angle grain boundaries.For extension twins within grain, they are activated in the process of specimen tension,but not in the process of unloading after tension.