Development of Textures in Recrystallization

Abstract

Conditions for the nucleation of recrystallized grains are briefly reviewed with emphasis placed on the orientation-dependent aspects. Distinction is drawn between nucleation sites within grains, at grain boundaries, and at transition bands. These sites are shown to have different orientation dependences. The role of second-phase particles is considered next, and their influence on the mechanisms and kinetics of recrystallization is related to the textures developed. Modification of annealing textures by soluble impurities is shown normally to result in retention of deformation texture components. Similar effects have been found to arise from long-range ordering, and may be attributed in both cases to a reduction in the ratio of growth rate to nucleation rate of recrystallized grains in the alloy. Conditions for growth selection of orientations have been re-examined in the light of new methods of texture description. The factors that influence texture development during grain growth after primary recrystallization are discussed briefly. Reference is made, where possible, to practical texture control in the manufacture of sheet metals and its influence during subsequent processing and use in service.