The junction between a {111}1||{111}2 twin plane and a perpendicular {1¯21}1||{¯12¯1}2 interface was investigated by means of the high-resolution electron microscopy of two -phase grains which exhibited a 180 twin relationship. The {111}-{1¯21} junction exhibited a region of complex contrast that was due to dislocations at the ends of both the {111} and (1¯21) facets. The {1¯21}1||{¯12¯1}2 twin interface could be produced either by    shear, or as the result of two    transitions. It then underwent a rigid-body shift at the interface in order to relax its structure.

B.J.Inkson, C.J.Humphreys: Philosophical Magazine A, 1996, 73[6], 1647-61