Recrystallization Texture Formation of a Heavily Cold Rolled Cu-15at%Al Alloy

Abstract

On the basis of "TTT diagram for the recovery and recrystallization", the recrystallization process in a heavily cold rolled Cu-15at%Al alloy was studied by measuring X-ray diffraction intensities of the major components in the rolling and recrystallization textures. In order to investigate the effect of recovery, nucleation and short range ordering on the formation of the recrystallization texture, the alloy sheets were annealed with two-step process composed of primary annealing and secondary one at a temperature higher than the primary.
The recrystallization process was retarded at temperatures below 540K. Two different values of the activation energy of the process were obtained in the temperature ranges below and above 540K, presumably due to the order-disorder transition. The two-step process enhanced the development of the major component of recrystallization texture when the primary annealing temperatures were below 600K, and the enhancement became stronger with decreasing the primary annealing temperatures.
These results are discussed from the viewpoint of the competition between recovery, nucleation-growth and short range ordering in recrystallization.