(1. 沈阳航空航天大学 材料科学与工程学院，沈阳 110136；
2. 中国科学院金属研究所，沈阳 110016)
摘 要: 基于EBSD技术所测得晶粒的欧拉角，建立了Schmid因子计算公式，用来计算HCP晶体中单个晶粒的Schmid因子。在此基础上，系统分析了镁合金板材拉伸变形时晶粒取向变化与不同微观变形模式的Schmid因子的关系。对镁合金棒材中的基面织构的Schmid因子分布特征进行了计算分析，结合镁合金棒材压缩变形的实测结果，分析了镁合金棒材压缩变形的力学性能及镁合金棒材径向压缩过程晶粒取向变化特征。结果表明：镁合金板材中的基面织构不利于基面滑移系和拉伸孪晶启动，而利于柱面和锥面滑移系启动，异步轧制对镁合金板材力学性能的提升有限。晶粒Schmid因子分布的差异导致镁合金棒材轴向和径向压缩时的微观变形机制存在差异，从而导致宏观力学性能差异明显。
关键字: 镁合金；变形机理；欧拉角；Schmid因子；织构
（1. School of Materials Science and Engineering, Shenyang Aerospace University, Shenyang 110136, China;
2. Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China）
Abstract:Formula on the Schmid factor (SF) was established with the Euler angles measured by the electronic backscatter diffraction technique (EBSD), which could be applied to calculate the SFs of HCP structural materials. With this formula, the relationship between variation of grain orientation and SFs for different plastic deformation modes during the extension of magnesium alloy sheet was systematically analyzed. The results show that the existence of basal texture within the magnesium alloy sheet is not beneficial for activations of basal sliding and extension twin, but beneficial for activations of prismatic and pyramidal slips. The improvement of the mechanical properties of magnesium alloy sheet caused by the differential speed rolling is limited. The differences in activation of micro deformation mechanism between axial and radical compressions of magnesium alloy rod are caused by their distinctive SFs for grain, which correspondingly result in obviously different mechanical properties for two loading cases.
Key words: magnesium alloy; deformation mechanism; Euler angles; Schmid factor; texture
