Abstract

The hot compression tests for Mo–3 vol.%Al₂O₃ alloys were conducted on a Gleeble-1500D thermo-mechanical simulator in the temperatures range of 1000–1300 °C and strain rates range of 0.005–1 s⁻¹. The hot deformation behavior, mechanism associated with microstructure evolution of Mo–3 vol.%Al₂O₃ alloys was investigated by electron backscattering diffraction analysis. Three types of stress–strain curves were analyzed by quantifying the work hardening rate. The deformation mechanism at 1000–1300 °C mainly included the plastic deformation of Mo–3 vol.%Al₂O₃ alloy, as well as the dynamic recovery and recrystallization of Mo matrix. The modified Arrhenius, Modified Johnson–Cook and modified Zerilli–Armstrong constitutive equations were established and evaluated by the correlation coefficient (R_c) and average absolute relative error (\({\bar{\text{e}}}\)). The flow stress of Mo–3 vol.%Al₂O₃ alloys could be well predicted by those three constitutive models, but modified Arrhenius constitutive model had a higher predicated accuracy.

Graphic Abstract

The hot deformation behavior, mechanism associated with microstructure evolution of Mo–3 vol.% Al₂O₃ alloys has been investigated by EBSD analysis. Three types of stress–strain curves were analyzed by quantifying the work hardening rate. The deformation mechanism at 1000–1300 °C mainly included the plastic deformation of Mo–3 vol.% Al₂O₃ alloy, as well as the dynamic recovery and recrystallization of Mo matrix. Moreover, modified Arrhenius constitutive model had a higher predicated accuracy for Mo–3 vol.% Al₂O₃ alloys than modified JC and modified ZA constitutive models.

中文翻译：

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Mo–3 vol％Al 2 O 3合金的热压缩机理和本构模型比较研究

摘要

Mo–3 vol。％Al ₂ O ₃合金的热压缩试验在Gleeble-1500D热机械模拟器上进行，温度范围为1000–1300°C，应变率范围为0.005-1s ^-1。通过电子背散射衍射分析研究了Mo–3 vol。％Al ₂ O ₃合金的热变形行为以及与组织演变有关的机理。通过量化加工硬化率来分析三种类型的应力-应变曲线。1000–1300°C下的变形机制主要包括Mo–3 vol。％Al ₂ O ₃的塑性变形。合金，以及Mo基体的动态恢复和重结晶。建立了修正的Arrhenius，修正的Johnson-Cook和修正的Zerilli-Armstrong本构方程，并通过相关系数（R _c）和平均绝对相对误差（\（{\ bar {\ text {e}}} \））进行评估。这三种本构模型可以很好地预测Mo–3 vol。％Al ₂ O ₃合金的流变应力，但改进的Arrhenius本构模型具有较高的预测精度。

图形摘要

通过EBSD分析研究了Mo–3 vol。％Al ₂ O ₃合金的热变形行为以及与组织演变有关的机理。通过量化工作硬化率来分析三种类型的应力-应变曲线。在1000–1300°C时的变形机理主要包括Mo–3体积％Al ₂ O ₃合金的塑性变形，以及Mo基体的动态恢复和再结晶。此外，改进的Arrhenius本构模型对Mo–3 vol。％Al ₂ O ₃合金的预测准确性高于改进的JC和改进的ZA本构模型。