Correlation between Boundary Misorientation and a Geometric Parameter for Cross‐Boundary Twins in Mg Alloys

Abstract

Cross-boundary twins (referred to as twin pairs) are frequently observed at grain boundaries with small grain boundary angle (u) in deformed Mg alloys. This study calculates the distribution of the high peak geometric compatibility factor (m 0 ) values over potential variants with u. The misorientation angles (a) between the potential variants of twin pairs are also evaluated. It reveals that a is a reasonable reflection of the m 0 parameter for ideal basal texture. There is a clear variant with high m 0 , but there may be two variants with similar small values of a. Moreover, it shows that u correlates reasonably with high peak values of m 0 , particularly below 30 of misorientation.

Enhancing mechanical properties of friction stir welded AZ31 alloys by post-weld compression

“…low grain boundary strengthening. This is identical with the statistical investigation detected by Xin et al [31], which shows that the low misorientation-angle distribution is associated with high strain transfer potentials between identical deformation modes. As presented in Figure 7(c,d), the single-step hot deformation after welding would limit the transmission of these predominant deformation systems across grain boundaries, especially for the basal slip transfer in the area adjacent to SZ-side.…”