科研之友
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摘要
In order to study the workability and establish the flow stress constitutive equation for ZK60 magnesium alloy, hot compressive deformation behavior of the magnesium alloy was investigated at the temperature range from 523 to 673 K and strain rate range from 0.001 to 1 s(-1) on Gleeble-1500 thermal simulator. The results show that flow stress of ZK60 magnesium alloy decreases with the increase of deformation temperature and the decrease of strain rate. The flow stress curves obtained from experiments are composed of four different stages, i.e., work hardening, transition, softening and steady stages. While for the relative high temperature and low strain rate, transition stage is not very obvious. A method to predict flow stress considering the effect of true strain was presented. Flow stress model is expressed by nine independent parameters and they are obtained by Least-Square method. The predicted stress-strain curves are in good agreement with the experimental results, which confirmed that the developed model can give a reasonable estimate of the flow stress for ZK60 magnesium alloy.
- 出版日期2009-7
- 单位中南大学
