Recrystallization Effects on the Forming Behaviour of Magnesium Alloy Sheets with Varied Calcium Concentration

The formation of strong textures with a preferential alignment of the basal planes in the sheet plane was an important disadvantage for the formability of magnesium alloy sheets. Rare earth or calcium-alloying concepts allow significant texture changes during rolling, resulting in weaker textures, and thus improved the formability. Such a texture development has also been associated with retarded recrystallization. However, this retardation affects the formability during sheet forming operations at elevated temperature. The wrought alloy AZ31 and its Ca-modified counterpart AZX310 are used for Nakajima forming tests at different temperatures. The influence of recrystallization on the sheet formability is demonstrated along different strain paths including local microstructure analysis. The weaker texture due to the addition of Ca allows maintaining the improved formability, which is counteracted by retarded recrystallization.