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取初始织构为c轴与板面法向垂直的强织构AZ31镁合金板材为初始样品,经液氮温度深低温轧制多道次至不同变形量,研究所得轧制板材的显微组织与织构演变,及其对轧制力学性能的影响。利用SEM、EBSD和XRD表征分析了轧制板材的显微组织和织构,应用准静态单轴拉伸实验分别测试了深低温轧制板材沿轧向(RD)和横向(TD)的室温力学性能。研究表明,{1012}拉伸孪晶是深低温轧制强织构AZ31镁合金板材中的主导孪晶类型,其对轧制板材的微观组织和织构影响较为显著。轧制变形后,大量的拉伸孪晶晶界不但对晶粒起到了分割碎化作用,并且由于孪晶对取向的剧烈改变,使得板材在轧制变形后c轴平行于ND的织构组分加强。深冷轧制板材的强度有所提高,但是延伸率却急剧下降,沿着RD方向的强度要高于TD方向的强度。
Take the initial texture c-axis and plate normal perpendicular to the textured AZ31 magnesium alloy sheet as the initial sample, the liquid nitrogen temperature and low temperature rolling many times to different deformation, the rolling mill obtained microstructure And texture evolution, and its impact on mechanical properties of rolling. The microstructure and texture of the rolled sheet were characterized by SEM, EBSD and XRD. The quasi-static uniaxial tensile test was used to test the room-temperature mechanics along the rolling direction (RD) and transverse direction (TD) performance. The results show that the {1012} tensile twins are the dominant twins in the AZ31 magnesium alloy sheets with deep-temperature rolling and have a significant effect on the microstructure and texture of the rolled sheet. After rolling deformation, a large number of tensile twin boundaries not only play a role in segregation and fragmentation of the grains, but also due to the dramatic changes in twin orientation, the c-axis of the sheet after rolling deformation is parallel to the texture of ND Strengthen points. The strength of the cold-rolled sheet has increased, but the elongation has dropped sharply, the strength along the RD direction is higher than the TD strength.