Dislocation Analysis of the Coupling of Grain Boundary Sliding and Migration during the Deformation of Zn Bicrystals

Abstract

The coupling of grain boundary sliding (GBS) and boundary migration (BM) is investigated during the deformation of Zn bicrystals with 30° 〈1010〉 symmetric tilt boundaries which are close to the special boundaries with ∑ = 15. An intensive and regular BM is observed during the development of GBS in Zn bicrystals with the 30° 〈1010〉 boundary, and BM is very weak in the case of deformation of Zn bicrystals with 86° 〈1010〉 boundaries. Selected bicrystals have different directions of the crystallographic grain rotations relative to each other, which results in differences in the interaction between lattice dislocations (LDs) and grain boundaries (GBs). The nature of the coupled GBS–BM development is considered on the basis of their dislocation mechanism and the crystallography of the LD–GB interaction. [Russian Text Ignored].