Microstructure evolution and mechanical response of extruded AZ31B magnesium alloy sheet at large strains followed by annealing treatment

Extruded AZ31B magnesium alloy sheets were stretched to large strains (7%, 13%, 15% and 17%) along the transverse direction, and then were annealed at 350 °C for 60 min. The uniaxial tensile tests and Erichsen tests on the as-received sheet and stretched samples in annealed condition (SA) were conducted. The results showed that the microstructure of extruded AZ31B magnesium alloy sheets was modified by static recrystallization (SRX). The basal texture intensity was significantly weakened and its spread became more dispersive. Compared with the as-received sheets, improved mechanical properties of SA sheets were achieved. The Erichsen value was significantly increased from 2.5 to 5.6 by about 124% due to the weakened texture.