Effects of the Rolling Procedures on the Recrystallization of Copper

Differential calorimetric analysis and X-ray texture measurement were made in order to investigate the effect of the variation of the rolling procedure on the recrystallization process in Cu sheets. The rolling procedures were as follows; (1) Primarily Cu sheets were cold rolled in one direction and then (2) secondary rolling was added in 45° direction of the primary rolling. The total reduction was 95% in thickness. (100) pole figures were made for both of the rolling and the recrystallization textures. The evolved energy as a function of the secondary reduction showed a minimum at about 50% reduction. This reduction rate corresponded to that of the minimum reflective intensity of 200 from the recrystallized sheets. For the reductions of 20∼60%, the apparent activation energy for the recrystallization increased, in contrast to the reverse tendency for the specimens secondarily rolled in the direction transverse to the primary rolling one. These could be interpreted in terms of the competition between the recovery and the grain growth processes, instead of the orientational relationships between the rolling and the recrystallization textures.