Crystallographic analysis on the primary and secondary extension twin variants in Mg alloys

18th International Conference on Textures of Materials

材料科学;物理学

Huang, Q.L.^1 ; Chen, G.^2 ; Xin, R.L.^2

School of Computer and Information Science, Southwest University, Chongqing

400715, China^1

College of Materials Science and Engineering, Chongqing University, Chongqing

400044, China^2

关键词: AZ31 Mg alloys;    Crystallographic analysis;    Geometric orientation;    Relative orientation;    Shear direction;    Specific orientation;    Tensor analysis;    Uniaxial tensions;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/375/1/012021/pdf
DOI  :  10.1088/1757-899X/375/1/012021

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

{10-12}-{10-12} double twins (DTs) are observed in AZ31 Mg alloys after one path uniaxial tension. Secondary twins (STs) are produced mainly from the intersecting points of two primary twins (PTs), forming the PTing-PTed-ST grouping. The relative orientations among these variants are analyzed. Statistical analysis reveals that the two primary variants have a specific orientation relationship with the geometric compatibility factor (m') of 0.562. The detwinning of PTedand ST also have such type of orientation. Moreover, the PTingand the selected ST have almost opposite shear directions with the angle of 151.1°. Tensor analysis conforms that these geometric orientation relationships are beneficial for minimizing the local strain incompatibility.