轧制态ME20M镁合金热拉伸变形行为及加工图

Hot Tensile Deformation Behavior and Processing Map of rolled ME20M Magnesium Alloy

摘要:

在变形温度为623~773K,应变速率为0.001~0.1s_^-1的条件下,通过INSPEKT Table 100kN电子万能高温实验机对轧制态ME20M镁合金进行了热拉伸实验,分析了变形温度和应变速率对材料流动应力的影响,建立了热变形条件下的本构模型及加工图。研究结果表明：随着变形温度的降低和应变速率的升高,轧制态ME20M镁合金的流动应力增加；建立的本构模型预测峰值应力与实验结果吻合较好,平均相对误差为5.19%；考虑应变对本构模型中材料常数影响后的预测应力值与实验值的相关度较高,平均相对误差为6.00%；最佳热加工范围为673~773K、应变速率0.001~0.01 s_^-1。

Abstract:

The hot tensile deformation behaviors of rolled ME20M magnesium alloy at temperatures of 623-773K and strain rates of 0.001-0.1s_^-1 were studied by INSPEKT Table 100kN universal high temperature experimental machine. The effects of deformation temperature and strain rate on the flow stress of the material were analyzed, and the constitutive model and processing map under hot deformation conditions were established. The results show that the flow stress of the rolled ME20M magnesium alloy increases with the decrease of deformation temperature or the increase of strain rate. The predicted peak stress of the constitutive model is in good agreement with the experimental results, and the average relative error is 5.19%. After considering the influence of strain on the material constant in the constitutive model, the predicted stress value is highly correlated with the experimental value, and the average relative error is 6.00%. The best hot working range is 673-773K, the strain rate of 0.001-0.01 s_^-1.