Optimum parameters and kinetic analysis for hot working of a homogenized Mg–8Sn–1Al–1Zn alloy

Abstract

Abstract Hot deformation behavior of a homogenized Mg–8Sn–1Al–1Zn (wt.%) (TAZ811) alloy was investigated at the temperature range of 523–673 K and the strain rate of 0.33–10 s− 1 to explore its potential as a wrought alloy. The kinetic analysis indicated that dislocation climb mechanism was likely to be an operative deformation mechanism for TAZ811 alloy. To obtain the optimum hot working parameters of the alloy, processing map consisting of a power dissipation map and an instability map was constructed. The practical processing window could be determined as T = 623–673 K and e ˙ = 0.33–3.3 s− 1 with a peak efficiency of approximately 20% occurring at 673 K and 0.33 s− 1. The flow instability region occurs at around the temperature of 523–598 K and stain rate of 0.33–0.66 s− 1. In addition, dynamic recrystallization (DRX) mechanisms were analyzed with respect to its microstructure, which was consistent with the predicted results from the processing map.