MODELING THE RECRYSTALLIZATION TEXTURES OF ALUMINUM-ALLOYS AFTER HOT DEFORMATION

The recrystallization textures of aluminum alloys can be explained by a growth selection of grains with an approximate 40 degrees < 111 > or ientation relationship out of a limited spectrum of preferentially for med nucleus orientations. Accordingly, recrystallization textures can be modeled by the multiplication of a function f(g)(nucl) describing t he probability of nucleation of the various orientations with a functi on f(g)(grow) representing their growth probability. Whereas the growt h probability can be accounted for by a 40 degrees < 111 > transformat ion of the rolling texture, the nucleation probability of the respecti ve grains is given by the distribution of potential nucleus orientatio ns, which is known from local texture analysis of rolled aluminum allo ys to be cube bands, grain boundaries, and second-phase particles. The contributions of these nucleation sites are determined according to a n approach to calculate the number of nuclei forming at each site, whi ch is based on microstructural investigations of the evolution of the various nucleation sites during deformation. This article describes th e model for recrystallization texture simulation in aluminum alloys an d gives examples of recrystallization textures of AA3004 deformed in p lane-strain compression at different deformation temperatures and stra in rates.