采用电子背散射衍射(EBSD)原位跟踪实验方法研究了AZ31镁合金压缩变形微观织构演变规律.在温度为170℃条件下,研究了AZ31镁合金轧制板材经过3次连续真空压缩(变形量分别为11%、17%和23%)时,其相同观察区域的微观织构演变.研究结果表明,AZ31镁合金轧制板材的微观织构为典型的(0001)基面织构.当温度为170℃、变形量为11%时,晶粒取向发生显著改变,大部分晶粒都发生了完全孪生,只有少数发生部分孪生,原始的基面轧制织构大幅减弱,孪生变体符合60°/<10(1)0>和86.3°/<(1)2(1)0>取向关系.随着变形量的增加,滑移开始启动,孪晶晶界减少,织构变化不明显.压缩变形过程微观织构演变机理主要以拉伸孪生为主,基本上没有压缩孪生出现.
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