SLIP PATTERN, MICROSTRUCTURE AND LOCAL CRYSTALLOGRAPHY IN AN ALUMINUMSINGLE-CRYSTAL OF COPPER ORIENTATION (112)[111]

The evolution of microstructure and local crystallography has been exa mined in single crystals of {112}[111] orientation of pure Al deformed al room temperature by channel die compression to strains of epsilon = 0.5 and epsilon = 1.5. Despite the channel die deformation mode used , a sample rotation towards the {4 4 11}[11 11 8] orientation was obse rved. Macroscopic shear bands were not seen. Instead, bands of localis ed glide on crystallographic planes were observed, associated both wit h shearing of the microstructure and with + TD rotated orientations. S uch strain localisation increased with increasing deformation. The com plexity of slip within these regions was confirmed by calculation of d islocation boundary characteristics from local TEM orientation measure ments. Dislocation densities calculated using Frank's formula are cons istent with the observed macroscopic slip pattern. (C) 1998 Acta Metal lurgica Inc.