LAUSR

Abstract Hot deformation behaviors of the extruded AZ80 + 0.4% Ce magnesium alloy plate were investigated in the temperature range of 300–420 °C and strain rate range of 0.0005–0.5 s−1 by using a Gleeble 3500 thermal simulation test machine. The cylindrical specimens for hot compression tests were cut in 0°, 45° and 90° to the extruded direction of the plate, respectively. The microstructure analysis was carried out with optical microscopy (OM), X-ray diffractometry (XRD) and scanning electronic microscopy (SEM). The results showed that the flow stresses of the 0°, 45° and 90° specimens exhibited anisotropic behaviors, which weakened with increasing temperatures, strains, and decreasing strain rates. The processing maps of different specimens were calculated and analyzed according to the dynamic materials model. The optimized stability domains for all the three specimens were in the temperature range of 380–420 °C and strain rate range of 0.0005–0.005 s−1, while the instability domains varied with specimen orientations. The apparent activation energy of the 0°, 45° and 90° specimens were 154.45 kJ/mol, 129.16 kJ/mol and 145.97 kJ/mol, respectively, suggesting the change of deformation mechanisms with specimen orientations. The operation of different slip systems, which were indicated by the varying values of the Schmid factor, should be responsible for the anisotropic hot deformation behaviors for the extruded AZ80 + 0.4%Ce magnesium alloy plate with basal texture.