Study on Flow Stress Characteristics of AZ31B under Multi-stage Hot Deformation
In order to improve the understanding of the rheological behavior of magnesium alloy AZ31B under multi-stage hot deformation,a series of isothermal compressing experiments with height reduction of 60% were performed at the temperatures of 250℃,300℃,350℃ and 400℃ and the strain rates of 0.01 s-1 and 0.1 s-1 on a Gleeble 1500 thermo-mechanical simulator.The effects of temperature (jump),strain rate (jump),deformation degree and deformation interval time on the flow stress characteristics are investigated and discussed.It is shown that in the dual-stage deformation process with temperature jump or strain rate jump,values of peak stress and peak strain at the second-stage are lower than those at single-stage.The reason for this change is due to the deformation stored energy still retained in the material after its release during the first-stage deformation and deformation interval,such as dynamic recrystallization,meta-dynamic recrystallization,static recovery and static recrystallization The deformation resistance of the multi-stage deformation of AZ31B can be reduced by increasing the deformation degree at the first-stage or the deformation interval because it leads to adequate release of deformation stored energy,which improves the plastic formability of magnesium alloy.
magnesium alloy Gleeble experiment multi-stage deformation flow stress
Xintong Wu Zhaoyang Jin Juan Liu Xin Huang
Department of Mechanical Engineering, Yangzhou University, China National Die & Mold CAD Eng.Research Center, Shanghai Jiao Tong University, China
国际会议
石家庄
英文
117-123
2012-10-26（万方平台首次上网日期，不代表论文的发表时间）