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Effects of Bending and Tension Deformation on Texture Evolution and Room Temperature Formability of AZ31B Alloy Sheets

In this study, the effects of bending and tension deformation on the texture formation and room temperature formability of Mg-3.0 mass%Al-1.0 mass%Zn-0.3 mass%Mn (AZ31B) alloy sheets were investigated. Bending and tension deformation was conducted in one to nine passes through the die with a 45° angled channel with and without rotating the sheets. The sheets that were subjected to bending and tension deformation through more than three passes exhibited a rolling direction (RD)-split texture, where the basal pole inclined toward the RD, and its inclination angle tended to increase with an increase in the number of passes. When the bending and tension deformation was conducted in six passes through the die by rotating the sheet 180° relative to the RD axis, the sheet exhibited superior room temperature formability (7.0 of the Erichsen value). The yield stress and Lankford value of the sheet subjected to bending tension deformation were closely related to the distribution of the basal pole. The results suggest that recrystallization nucleated at secondary twins as well as lattice rotation likely caused the formation of the RD-split texture. [doi:10.2320/jinstmet.J2019002]