(1. 北京科技大学 材料科学与工程学院， 北京 100083;
2. 中国兵器工业 第五九研究所， 重庆 400083)
摘 要: 利用背散射电子衍射取向成像技术， 定量分析了具有初始织构的AZ31镁合金平面应变压缩时的孪生过程。 结果表明： 初始织构为晶粒单胞的c轴平行于轧向时， 晶粒内部的{101-2}孪生是主要的形变机制， 产生（0001）轧面的基面织构。 随形变量的加大及孪晶的增多， 86.3°〈112-0〉的孪晶取向关系先急剧增加， 然后明显降低。 孪晶量与基面取向晶粒的面积百分数对应， 而跟孪晶关系出现的多少不相对应。 测定了应变量与孪晶量的定量关系， 并讨论了可能出现的误差。
关键字: 镁合金； 形变； 孪晶； 织构
（ 1. School of Materials Science and Engineering,
University of Science and Technology Beijing,
Beijing 100083, China;
2. The 59th Institute of Chinese Weapon Industry,
Chongqing 400083, China）
Abstract: The twinning process in a magnesium AZ31 alloy with initial texture is quantitatively analyzed during plane-strain compression by means of orientation mapping based on EBSD technique. The results indicate that the {101-2} twinning of c-axis tension is the main deformation mechanism if c-axes of most grains in initial sample are parallel to the rolling direction. The strong basal texture of 〈0001〉ND will be resulted. As the strain increases, the number of twin relationship of 86.3°〈112-0〉 increases to a maximum and then reduces. It is indicated that the amount of twins is proportional to the basal-oriented grains and not to the number of twin relationship detected. A quantitative relationship of strain and twin amount is given and the related errors are discussed.
Key words: magnesium alloy; deformation; twinning; texture
