Study on Hot Compression Deformation and Processing Map of Mg-6Al-2Si-1.5Er Mg Alloy

The hot compression experiments of Mg-6Al-2Si-1.5Er Mg alloy were carried out by Gleeble3000 thermosimulation machine. The effects of deformation temperature and strain rate on the hot compression deformation behavior of Mg-6Al-2Si-1.5Er Mg alloy at 473-673 K and 0.002-5 s⁻¹ were discussed. The deformation activation energy was calculated by using the hyperbolic logarithmic curve of stress–strain. The constitutive equation was constructed based on the dynamic material model, and the hot processing map of the alloy was established. At the same strain rate, the peak stress and steady-state flow stress decrease with the increase of temperature. At the same deformation temperature, the flow stress increases with the increase of strain rate. The results show that the optimum hot working temperature and strain rate of the alloy are 643-673 K and 0.002-0.02 s⁻¹, respectively, and the deformation activation energy Q = 193.37 kJ/mol.