在变形温度为523-673 K,应变速率为0.001-1s-1的条件下,采用Gleeble-1500热模拟试验机对ZK60镁合金的热变形行为进行了研究.结果表明,ZK60镁合金流变应力随变形温度升高和应变速率的降低而减小.其高温压缩流变应力曲线可描述为加工硬化、过渡、软化和稳态流变4个阶段,但在温度较高和应变速率较小时,过渡阶段不很明显.建立了-个包含应变的流变应力预测模型,模型中的9个独立参数可以通过非线性最小二乘法拟合求得,预测的流变应力曲线与实验结果吻合较好.
In order to study the workability and establish the flow sttess constitutive equation for ZK60 magnesium alloy,hot compressive deformation behavior of the magnesium auoy 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 obtmned from experiments are composed of four difierent 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 efrect 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.
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