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采用拉、压循环试验测试了AZ31镁合金的包辛格效应(BE),并研究了BE的机制。测试结果表明:压缩预变形后反向拉伸出现明显的BE,而拉伸预变形后反向压缩出现反包辛格效应(RBE);且包辛格效应比反包辛格效应明显。循环拉、压加载过程中的显微组织和晶体取向演化研究结果表明,出现包辛格效应是由于预压缩时改变晶粒取向与反向拉伸时去孪生效应共同作用的结果;预拉伸变形虽然不改变晶粒取向,但使轴比c/a值降低,使反向压缩时发生孪生更加困难,从而导致反包辛格效应。
The Bauschinger effect (BE) of AZ31 magnesium alloy was tested by pull and pressure cycle test and the mechanism of BE was studied. The test results show that there is obvious BE in the reverse drawing after compression pre-deformation, and the reverse compressing results in the anti-Bauschinger effect (RBE) after the pre-deformation. The Bauschinger effect is more obvious than the anti-Bauschinger effect. The results of microstructure and crystal orientation evolution during cyclic drawing and pressure loading show that the appearance of the Bauschinger effect is due to the combined effect of de-twinning effect when the grain orientation is changed during pre-compression and the reverse stretch; Although the deformation does not change the orientation of the grains, the axial ratio c / a decreases, making it more difficult for twinning to occur during the reverse compression, resulting in the anti-Binding effect.