摘要
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 the experiment of cyclical tension and compression, and the mechanisms of BE were investigated. The test results show that the BE is apparent during tension after compression pre-strain, but in compression after tension pre-strain the reverse Bauschinger effect （RBE） is displayed. Furthermore, the BE is much stronger than the RBE. The microstructure and grain orientation evolvement during cyclical tension and compression show that the cause of the BE is the combination of the reorientation in pre-compression and the effect of detwinning during subsequent tension, which make the tension yield limit decrease. Though the grain orientation is not changed, the decrease of c/a ratio after pretension makes the twinning more difficult in recompression, resulting in the RBE.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2011年第4期615-619,共5页
Rare Metal Materials and Engineering
基金
重庆市自然科学基金(CSTC
2007BB4111)
关键词
AZ31镁合金
包辛格效应
反包辛格效应
晶粒取向
AZ31 magnesium alloy
Bauschinger effect
reverse Bauschinger effect
grain orientation
