Effect of Microelement Calcium on Thermal Deformation Behavior of AZ31 Magnesium Alloy
XIE Yulu, HUANG Guangsheng, LIU Shuaishuai, ZHANG Junlei, PAN Fusheng
National Engineering Research Center for Magnesium Alloys, State Key Laboratory of Mechanical Transmission, College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China
Abstract: The isothermal compression tests of AZ31 magnesium alloy and addition of 0.2wt% Ca of AZ31 magnesium alloy (AZ31-0.2Ca) were carried out on the Gleeble-3500 thermal simulation testing machine in the temperature range from 300 ℃ to 500 ℃ and the strain rate range from 0.001 s-1 to 1 s-1. Based on the stress-strain curves, the constitutive equations established by hyperbolic sine function and the processing maps established using dynamic material model (DMM), the influence of Ca on thermal deformation behavior of AZ31 magnesium alloy was systematically analyzed. The results indicate that the addition of Ca increases the stress level at lower temperature and higher strain rate, reduces the stress exponent n value, and has a negligible influence on the activation energy Q value. In addition, adding Ca can expand the processing zone of AZ31 magnesium alloy, and the optimal processing zone of the AZ31-0.2Ca is in the temperature range of 400—490 ℃, the strain rate range of 0.001—0.01 s-1 and the temperature range of 420—480 ℃, the strain rate range of 0.2—1 s-1.
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2020, Vol. 34 
