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

The evolution of crystal lattice orientations in two aluminum bicrysta ls with S orientations, during channel die compression has been studie d in detail. The boundary planes of the bicrystals were parallel to th e plane of compression. The textures developed in each component cryst al and at the boundary between the two crystals were examined as a fun ction 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, initi ally high angle in nature, became a low angle boundary. In the other b icrystal, the initial orientations of the component crystals were foun d to be largely stable. Except for some minor orientation adjustments, they remained essentially in their initial orientations, and the bicr ystal boundary retained its high angle misorientation. Results of theo retical analyses using a numerical model appear to explain the texture development and the behavior at the boundary of the bicrystals very s atisfactorily.