Recrystallization texture development in commercial AlMnMg alloys

A detailed investigation of the evolution of recrystallization textures during annealing after hot rolling of an Al1Mn1Mg alloy and after hot and cold rolling of an Al1Mn0.5Mg alloy has been carried out, using the EBSP-technique for identification of the individual grain orientations. The growth of grains with a 40°〈111〉 orientation relationship to components in the rolling texture has been followed and compared to the growth of random oriented grains. No oriented growth effect due to an enhanced mobility of 40°〈111〉 boundaries could be detected. However, during low temperature annealing of one of the alloys grains belonging to different texture components were observed to grow at different rates. This special case is associated with a precipitation reaction occurring simultaneously with recrystallization, and the observation is interpreted as a precipitation-induced-effect reflecting that particle stimulated nucleation (PSN) is more sensitive to precipitation than nucleation from the competing 40°〈111〉 sites. In order to illustrate the effect of grains growing at different rates on the structure and texture development, a computer model has been applied for simulating the recrystallization reaction. Reasonable predictions of the kinetics, grain size distribution and final texture (volume fractions) have been obtained.