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采用电子背散射技术(EBSD)对镁合金在100℃下的压缩变形过程中的晶粒取向变化进行了原位跟踪,对变形过程的滑移系和孪晶开动进行了定量分析。基于对不同滑移系的施密特因子(SF)在拉伸孪晶启动前后变化的计算,分析了拉伸孪晶启动对后续变形过程中滑移系开动的影响。结果表明,在拉伸孪晶启动前后,具有基面织构取向晶粒的基面滑移系施密特因子无明显变化,而柱面滑移系的施密特因子在孪晶后则大幅度降低,在随后的变形中不易启动,同时,锥面滑移系的施密特因子在孪晶后大幅增加,因此在随后的变形中相对容易启动。
The electronic backscattering (EBSD) method was used to track the grain orientation changes of magnesium alloy during the compressive deformation at 100 ℃. The slip system and twinning of the magnesium alloy were quantitatively analyzed. Based on the calculation of the Schmitt ’s (SF) variation of different slip systems before and after the initiation of tensile twinning, the effect of twinning start on the slip system initiation during subsequent deformation was analyzed. The results show that there is no significant change in the Schmidt factor of basal plane slip system with basal plane texture oriented grains before and after the stretching twinning, while the Schmidt factor of cylindrical slip system is larger after twinning The magnitude decreases and does not start easily in the subsequent deformations. Simultaneously, the Schmidt factor of the cone-slip system increases significantly after twins and therefore is relatively easy to start in subsequent deformations.