Differences in Microstructure and Texture Development during Deformation and Recrystallization of Copper and Aluminium (110) [001] Single Crystals

摘要

Cu and Al single crystals with the orientation (110)[001] were cold rolled and subsequently channel die compressed (CDC). The new direction of plastic flow during CDC was parallel to the former transverse rolling direction and the compressed surface was parallel to the rolling plane. The microstructure after rolling was uniform in both materials. Shear bands were formed in Cu during the CDC, while any forms of localized structural inhomogeneities were not observed in Al. In case of Al the CDC brought about only a rotation of the initial orientation around the normal direction (ND) up to about 14 deg. In the case of Cu, recrystallization commenced within shear bands and proceeded by a growth of selected grains into the deformed matrix. The local crystallographic orientation measurements revealed that the oriented growth of grains played an important role in the formation of recrystallization textures. Orientations of the fastest growing grains could be obtained from the orientations found in the deformed material by their rotation around the common < 111 > pole by about 30 deg or 50 deg. Distribution of earliest recrystallized grains in Al was essentially random and after completion of recrystallization the grains were much larger than in Cu. The measurements of the {111) pole figures indicated that recrystallization textures of both materials were formed according to the oriented growth theory.