Dynamic recrystallization, twinning behaviors and mechanical response of pre-twinned AZ31 Mg alloy sheet along various strain paths at warm temperature
Xiaohuan Pan, Lifei Wang, Liangliang Xue, M. Sabbaghian, Pengbin Lu, Wei Wu, Guangsheng Huang, Bin Xing, Hongxia Wang
Abstract
In this study, AZ31 Mg alloy sheet was pre-twinned at room temperature along the transverse direction (TD) to introduce {10–12} tensile twins. The uniaxial tensile experiment was conducted at 200 °C to investigate the dynamic recrystallization, twinning behaviors and mechanical response. The strain paths tilted angles of 0°, 15°, 30°, 45°, 60°, 75° and 90° in respect to the rolling direction (RD) on the RD-TD plane were considered. Results revealed that the strain path has significant effects on the microstructural evolution and mechanical response at warm temperature. When the strain path tilts were 0°, 15°, 30°, 45° and 60° with the RD, continuous dynamic recrystallization (CDRX) was the main mechanism to coordinate strain. The detwinning dominated the microstructural evolution but retarded by CDRX for the pre-twinned sample with a strain path angle of 75°. Detwinning and CDRX played an important role on the microstructural evolution in the pre-twinned sample when the strain path was tilted 90°. Additionally, the effect of CDRX on {10–12} twinning and three types of {10–12} tensile twin behaviors were discussed. Both strengthening and weakening effects were observed in pre-twinned samples.