Two types of Al bicrystals (bicrystals 1 and 2) having an asymmetrical tilt grain boundary were grown. In bicrystal 1, the orientations of component grains were related to each other by a 45° rotation about the normal of the wide surface of the tensile specimen. In bicrystal 2, although the primary slip planes were symmetrical about the grain boundary plane, the component grains were related to each other by a 180° rotation about the tensile axis of the specimen. The specimens were deformed to a tensile strain of 0.3, and subsequently annealed. In both bicrystals, deformation bands were not formed symmetrically about the grain boundary. After annealing, no strain-induced boundary migration was found. Recrystallization occurred via a <111> rotation mechanism. These results were compared with deformation and recrystallization in Al bicrystals having a symmetrical tilt grain boundary.

Deformation and Recrystallization of Aluminum Bicrystals Having Asymmetric Tilt Grain Boundary. T.Okada, M.Kotaka, T.Wada, M.Tagami, F.Inoko: Materials Transactions, 2006, 47[3], 838-44