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利用取向成像研究镁合金的孪生过程
Investigation of twinning process in magnesium alloy by means of orientation mapping
【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{1012}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°〈1120〉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。
【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 {1012} 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°<1120> 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.
- 【文献出处】 中国有色金属学报 ,The Chinese Journal of Nonferrous Metals , 编辑部邮箱 ,2004年01期
- 【分类号】TG111.7
- 【被引频次】30
- 【下载频次】517