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采用热压缩试验获得了铸态AZ31B镁合金高温变形时的流变曲线,分析了变形温度和应变速率对流动应力的影响。结果表明:峰值应变随着应变速率增加和温度减小而增大,减小应变速率、适当提高变形温度对材料的动态回复和再结晶是有利的。利用多元回归分析建立了流动应力预测模型,该模型可以描述流动应力的应变敏感性,经验证发现使用其预测流动应力具有较高精度,相关系数高达0.9926,能较好地描述铸态AZ31B镁合金在热变形过程的流动行为。
The rheological curves of as-cast AZ31B magnesium alloy were obtained by hot compression test. The influence of deformation temperature and strain rate on the flow stress was analyzed. The results show that the peak strain increases with the increase of strain rate and temperature, and decreases the strain rate. Appropriately increasing the deformation temperature is beneficial to the dynamic recovery and recrystallization of the material. Using multiple regression analysis to establish a flow stress prediction model that can describe the strain sensitivity of flow stress. It has been verified that using it to predict the flow stress with high accuracy, the correlation coefficient is as high as 0.9926, which can well describe the as-cast AZ31B magnesium alloy Flow behavior during hot deformation.