Abstract Hot deformation behavior of the annealed ZK61M magnesium alloy sheet was explored using tensile tests with strain rates varying from 0.001 to 0.030 s −1 in temperatures range of 423–513 K. The obtained results indicate that the flow stress increased with deformation temperature decreasing and strain rate increasing. Dynamic recrystallization (DRX) occurs when the temperature is higher than 423 K, and the recrystallization volume fraction increases with temperature rising. At a given temperature, the measured DRX volume fraction at a higher strain rate is smaller than that at a lower strain rate. Dimples are observed throughout the tested temperature range. Moreover, they grow larger as temperature increases. An average absolute relative error (AARE) of 2.65% proves that the peak stress predicted by the constitutive model is in good agreement with the experimental results. The correlation coefficient ( R ’) obtained for the predicted stress and the experimental value considering the strain on the material constant are between 0.9831 and 0.9977. In addition, AARE and root mean square error (RMSE) are less than 6.5% and 8.5 MPa, respectively. This indicates that the deviation of the predicted value from the experimental value is small and the predictions of the proposed model are reliable. Graphic abstract

中文翻译：

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ZK61M高强镁合金薄板热拉伸变形行为及本构模型

摘要 使用应变速率从 0.001 到 0.030 s -1 在 423-513 K 范围内变化的拉伸试验研究了退火后的 ZK61M 镁合金板的热变形行为。所得结果表明，随着变形温度的降低和应变率增加。当温度高于 423 K 时会发生动态再结晶 (DRX)，并且再结晶体积分数随着温度的升高而增加。在给定温度下，在较高应变率下测得的 DRX 体积分数小于在较低应变率下测得的 DRX 体积分数。在整个测试温度范围内观察到凹痕。此外，它们随着温度的升高而变大。平均绝对相对误差 (AARE) 为 2。65% 证明本构模型预测的峰值应力与实验结果吻合较好。为预测应力和考虑材料常数应变的实验值获得的相关系数 (R') 介于 0.9831 和 0.9977 之间。此外，AARE 和均方根误差 (RMSE) 分别小于 6.5% 和 8.5 MPa。这表明预测值与实验值的偏差很小，所提出模型的预测是可靠的。图形摘要 分别。这表明预测值与实验值的偏差很小，所提出模型的预测是可靠的。图形摘要 分别。这表明预测值与实验值的偏差很小，所提出模型的预测是可靠的。图形摘要