Enhanced stretch formability of AZ31 magnesium alloy sheet by secondary regulation of initial twin orientation

To modify the basal texture and improve the formability of the magnesium alloy sheet, in-plane shear deformation is introduced into the pre-twinned AZ31 Mg alloy sheet. The twinning orientation is secondary regulated and rotates away from the transverse direction about 20 degrees after shear deformation. After annealing, the recrystallized grains inherit the grain orientation of rotating twins. Thus, the basal texture is significantly weakened. Compared with the received sample, the average fracture elongation of sheared and annealed sample improves from 15.3 % to 28.5 %. The Erichsen value increases from 2.79 mm to 5.63 mm due to the secondary regulation of initial twin orientation (SRITO).

Automated summary

In-plane shear deformation is introduced into the pre-twinned AZ31 Mg alloy sheet to modify the basal texture and improve the formability. The twinning orientation is secondary regulated and rotated away from the transverse direction, resulting in a significant weakening of the basal texture. After annealing, the recrystallized grains inherit the grain orientation of rotating twins, leading to improved fracture elongation and Erichsen value.