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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°/<1010>和86.3°/<1210>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。
The microstructure evolution of AZ31 magnesium alloy under compressive deformation was studied by in-situ tracking experiment with electron backscatter diffraction (EBSD). Under the condition of 170 ℃, the microstructure evolution of AZ31 magnesium alloy rolled plate in the same observation area after three times of vacuum compression (deformation amount is 11%, 17% and 23% respectively) was studied. The results show that the microstructure of AZ31 magnesium alloy rolled sheet is a typical (0001) basal texture. When the temperature is 170 ℃, the deformation is 11%, the grain orientation changes significantly, most of the grains are completely twins, only a small number of partial twins, the original base rolling texture significantly weakened, twins Meet the 60 ° / <1010> and 86.3 ° / <1210> orientation relationship. With the increase of the deformation, the slippage started to start, the twin grain boundaries decreased and the texture did not change obviously. The microstructure evolution mechanism of the compressive deformation process is dominated by stretching twins, with virtually no compression twins.