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采用热压缩实验研究Mg-8Zn-1Al-0.5Cu-0.5Mn镁合金在温度为200~350°C、应变速率为0.001~1 s-1条件下的热变形行为。结果表明,流变应力随着应变速率的增加而明显增大,随着变形温度的升高而减小。同时,采用回归分析的方法建立预测合金流变应力的模型,该模型与实验结果能较好地吻合。以动态材料模型为基础建立合金的热加工图,从加工图中可以看出,随着应变的增大,合金的非稳态区域变大,合金在高温和低应变速率下具有良好的加工性。
The hot deformation behavior of Mg-8Zn-1Al-0.5Cu-0.5Mn magnesium alloy at 200 ~ 350 ° C and strain rate of 0.001 ~ 1 s-1 was investigated by hot compression test. The results show that the flow stress increases with the increase of strain rate and decreases with the increase of deformation temperature. At the same time, a regression model was established to predict the flow stress of the alloy. The model is in good agreement with the experimental results. Based on the dynamic material model, a hot working diagram of the alloy is established. It can be seen from the processing diagram that as the strain increases, the non-steady region of the alloy becomes larger and the alloy has good workability at high temperature and low strain rate .