RECRYSTALLIZATION TEXTURE DEVELOPMENT IN COMMERCIAL AL-MN-MG ALLOYS

A detailed investigation of the evolution of recrystallization texture s during annealing after hot rolling of an Al1Mn1Mg alloy and after ho t and cold rolling of an Al1Mn0.5Mg alloy has been carried out, using the EBSP-technique for identification of the individual grain orientat ions. The growth of grains with a 40 degrees[111] orientation relation ship to components in the rolling texture has been followed and compar ed to the growth of random oriented grains. No oriented growth effect due to an enhanced mobility of 40 degrees[111] boundaries could be det ected. 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 precipitat ion reaction occurring simultaneously with recrystallization, and the observation is interpreted as a precipitation-induced-effect reflectin g that particle stimulated nucleation (PNS) is more sensitive to preci pitation than nucleation from the competing 40 degrees[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 appl ied for simulating the recrystallization reaction. Reasonable predicti ons of the kinetics, grain size distribution and final texture (volume fractions) have been obtained.