Hot deformation processing map of AZ31 magnesium alloy and its application

To determine the deformation parameters of AZ31 magnesium alloy, the hot deformation behavior of the alloy was investigated by hot compression testing on a Gleeble-3500 stimulator. The principle of dynamic material modeling was used to develop the hot processing map. There is a dynamic recrystallization peak zone in the processing map at temperatures from 380 to 400℃ and strain rates from 3 to 12 s^-1, and the efficiency of power dissipation is more than 30%. A fine equiaxed grain size of 2.3 μm could be achieved when differential speed rolling is processed in this region. The tensile strength is 322.7 MPa and the elongation is 19.6%. At strain rates of 15 to 50 s^-1, there are two flow instability zones:at temperatures of 250 to 300℃ the ductility of the alloy decreases obviously, but at temperatures of 350 to 400℃ the alloy has a mischcrystal structure.