Effect of pre-deformation on microstructure characteristics, texture evolution and deformation mechanism of AZ31 magnesium alloy

According to the stress characteristics of the section of the wall reducing section in the cold rolling process of two roll pilger tube, the room temperature pre-deformation and secondary compression experiment of AZ31 magnesium alloy are carried out, and the effects of pre-deformation on the microstructure and plastic deformation mechanism of AZ31 magnesium alloy are studied by combining EBSD analysis with VPSC model. The results show that with the increase of pre-deformation, {0001} basal texture gradually disappears, and the twinning texture of c-axis parallel to ED direction gradually increases. When the secondary compression is 8%, it has completely transformed into the twinning texture of c-axis parallel to ED direction. Comparing the secondary compression properties under different pre-deformation amounts, it is found that the greater the pre-deformed texture strength produced by pre-deformation, the greater the yield strength in the corresponding secondary compression process. When the pre-deformation is 3%, the yield strength increases by 67%; When the pre-deformation is 5%, the yield strength increases by 130%. At the same time, the activation of { 10 1 ‾ 1 } compression twin greatly influences the secondary compression plasticity of magnesium alloy.