Recrystallization process and texture change of Mg-Y alloy rolled sheet

This paper reports the texture weakening associated with the characteristic recrystallization processes of cold-rolled and hot-rolled Mg-Y alloy during annealing at 400°C. After rolling, severely strained regions were formed along grain boundaries for the cold-rolled samples and across neighboring grains for the hot-rolled samples. In the severely strained regions, the cold-rolled sample showed the presence of the 〈c+a〈 dislocations, while the hot-rolled sample showed the formation of multiple twins. The results suggested that the texture weakening after annealing was due to the formation of nucleation site for recrystallization near boundaries by the high activity of the 〈c+a〈 dislocations in the cold-rolled sample. Meanwhile, in the hot-rolled sample, it was due to the formation of multiple twins which acted as the nuclei of recrystallized grains. © 2015 The Japan Institute of Light Metals.