DEFORMATION TEXTURE OF CHANNEL-DIE DEFORMED ALUMINUM BICRYSTALS WITH S-ORIENTATIONS

The evolution of crystal lattice orientations in two aluminum bicrystals with S orientations, during channel die compression has been studied in detail. The boundary planes of the bicrystals were parallel to the plane of compression. The textures developed in each component crystal and at the boundary between the two crystals were examined as a function of deformation. In one of the bicrystal assemblies, the initial orientations of the component crystals were found to be unstable. They rotated to a common orientation. Hence, the bicrystal boundary, initially high angle in nature, became a low angle boundary. In the other bicrystal, the initial orientations of the component crystals were found to be largely stable. Except for some minor orientation adjustments, they remained essentially in their initial orientations, and the bicrystal boundary retained its high angle misorientation. Results of theoretical analyses using a numerical model appear to explain the texture development and the behavior at the boundary of the bicrystals very satisfactorily.