In this study,uniaxial hot compression tests were carried out between 200 and 400℃ over strain rates of0.001-1 s-1 to investigate the hot deformation behavior of Mg-2 Zn-1 Al-0.2 RE alloy with coarse grains.The avera...In this study,uniaxial hot compression tests were carried out between 200 and 400℃ over strain rates of0.001-1 s-1 to investigate the hot deformation behavior of Mg-2 Zn-1 Al-0.2 RE alloy with coarse grains.The average activation energy was measured to be 174.51 kJ/mol.In addition,a constitutive relation based on the Arrhenius equation was established.Dynamic recrystallization(DRX) kinetics were studied by Avrami equation to characterize the evolution of DRX volume fraction.DRX was favored at high temperatures of 300-400℃ and low strain rates of 0.001-0.01 s-1.According to dynamic material model and Prasad’s instability criterion,a maximum power dissipation of 38% and 32% occurs at 400℃/0.001 s-1 and 400℃/0.01 s-1,respectively.According to the proce ssing map,330-400℃/0.001-0.01 s-1was determined as the optimum deformation parameter range.展开更多
基金the National Key Research and Development Program of China(2016YFB0301104)National Natural Science Foundation of China(51771043)。
文摘In this study,uniaxial hot compression tests were carried out between 200 and 400℃ over strain rates of0.001-1 s-1 to investigate the hot deformation behavior of Mg-2 Zn-1 Al-0.2 RE alloy with coarse grains.The average activation energy was measured to be 174.51 kJ/mol.In addition,a constitutive relation based on the Arrhenius equation was established.Dynamic recrystallization(DRX) kinetics were studied by Avrami equation to characterize the evolution of DRX volume fraction.DRX was favored at high temperatures of 300-400℃ and low strain rates of 0.001-0.01 s-1.According to dynamic material model and Prasad’s instability criterion,a maximum power dissipation of 38% and 32% occurs at 400℃/0.001 s-1 and 400℃/0.01 s-1,respectively.According to the proce ssing map,330-400℃/0.001-0.01 s-1was determined as the optimum deformation parameter range.
