Abstract

Hot compression behaviors of Pb-Mg-Al-B-0.4Y alloy under strain rate of 0.001-1 s⁻¹ and temperature of 493-613 K were performed by employing hot compressing tests. According to the experimental stress–strain curves, as the strain increases, the flow stress increases firstly, then reaches the peak stress, and finally decreases to a steady state. Constitutive equations in traditional Arrhenius model and improved Arrhenius model in multi-linear regression were used to predict the flow stress of Pb-Mg-Al-B-0.4Y alloy. The values of MARE and RMSE in the traditional Arrhenius model are 11.780 and 21.169%, respectively, which are larger than 7.227 and 7.447% of the improved Arrhenius model, indicating that the predicted accuracy of the improved Arrhenius model is more accurate. The hot processing maps under the experimental conditions were established. Based on processing maps and microstructure observation, the optimum processing parameters are 0.001 s⁻¹ ≤ \(\dot{\varepsilon }\) ≤ 0.01 s⁻¹ and 587 K ≤ T ≤ 613 K.

中文翻译：

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热压下Pb-Mg-Al-B-0.4Y合金的本构方程，工艺图和组织

抽象的

Pb-Mg-Al-B-0.4Y合金在0.001-1 s ^-1应变速率下的热压缩行为通过热压缩试验进行温度为493-613K的试验。根据实验应力-应变曲线，随着应变的增加，流动应力首先增大，然后达到峰值应力，最后减小至稳态。传统的Arrhenius模型的本构方程和改进的Arrhenius模型的多线性回归用于预测Pb-Mg-Al-B-0.4Y合金的流变应力。传统Arrhenius模型中的MARE和RMSE值分别为11.780％和21.169％，大于改进的Arrhenius模型的7.227％和7.447％，表明改进的Arrhenius模型的预测准确性更为准确。建立了实验条件下的热加工图。根据加工图和微观结构观察，^-1  ≤  \（\点{\ varepsilon} \）  ≤0.01秒^-1和587ķ≤  Ť  ≤613 K.