Formation mechanisms of recrystallization textures in aluminum sheets based on theories of oriented nucleation and oriented growth
(Department of Materials, State Key Laboratory for Advanced Metals and Materials,
University of Science and Technology Beijing, Beijing 100083, China)
University of Science and Technology Beijing, Beijing 100083, China)
Abstract: The recrystallization textures in 95% rolled aluminum sheets with different purities and initial textures were investigated. The effects of recovery levels and the dragging effects induced by impurities on the effective driving force and corresponding behaviors of oriented nucleation and oriented growth during annealing were analyzed. The oriented nucleation is a common behavior in the initial stage of primary recrystallization if the effective driving force in deformed matrix is not too high to reduce the necessity of nucleation period. Oriented growth might appear if the temperature is not too high and the grains, of which the misorientation to matrix is about 40°á111？, have enough time and space to expand growth advantages, while certain reduction of effective driving force is also necessary. The recrystallization textures could be changed by controlling initial textures and effective driving forces which can be regulated by recovery levels and dragging effects.
Key words: aluminum; recrystallization; texture; recovery; stored energy; boundary migration