Hot deformation behaviors of the Twin-roll Casted (TRCed) AZ31 magnesium alloy were studied by uniaxial compression tests under a temperature range of 473–673K and strain rate of 0.001–1s?1. The effects of the temperature on activation energy and recrystallization were discussed, and the degree of DRX had also been discussed in detail considering the activation energy and processing maps. The results showed that the activation energy is significantly dependent on temperature, and its value increases gradually with the increasing of temperature. The activation energy increased to 192kJ/mol when the deformation temperature is within 473–673K. The values ofQare close to the energy of lattice self-diffusion of magnesium alloy in the region of 473–523K and 523–623K. Basal slip and twinning are the main deformation mechanisms in the region of low temperature (473–523K). The critical shear stress of non-basal slips decreases with the increasing of temperature, so prismatic slips and pyramidal slips are easy to initiate when the deformation temperature raise to 523–623K. The optimized processing parameters at 523–580K/0.007–0.018s?1of TRCed AZ31 alloy were obtained from processing maps. Through the verification of the microstructure, it was found that the best performance occurs under the deformation condition of 573K/0.01s?1. More importantly, the practical rolling shows that the suitable processing fitting of the formed area is correct.
展开▼
