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摘要：
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研究了挤压态镍黄铜HNi55-7-4-2合金高温本构模型的修正方法及其变形激活能的演化规律，对HNi55-7-4-2合金进行不同变形温度（873~1073 K）及应变速率（0.01~10 s-1）条件下的等温热压缩实验，获取了HNi55-7-4-2合金的流动应力-流动应变曲线。基于材料参数和变形激活能对变形条件的依赖，构建了一种考虑变形条件对材料参数影响的修正本构模型。经验证，修正本构模型能很好地预测HNi55-7-4-2合金的高温流动应力，其预测精度高。在不同变形条件下应用修正本构模型计算变形激活能，变形激活能受到变形温度、应变速率和变形量的综合影响，其变化范围在119.0~173.2 kJ·mol-1之间。此外，变形激活能随着变形温度的增加而降低，随着应变速率的增加先降低后升高。
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The modification method of high temperature constitutive model and the evolution law of deformation activation energy for extruded nickel brass HNi55-7-4-2 alloy were studied, and the isothermal hot compression experiments under different deformation temperatures of 873-1073 K and strain rates of 0.01-10 s-1 for HNi55-7-4-2 alloy were performed to obtain the flow stress-flow strain curves. Then, based on the dependence of material parameters and deformation activation energy on the deformation conditions, a modified constitutive model considering the influences of deformation conditions on the material parameters was constructed. The verification shows that the modified constitutive model predicts the high temperature flow stress of HNi55-7-4-2 alloy with high prediction accuracy, and the modified constitutive model is used to calculate the deformation activation energies under different deformation conditions. In addition, the deformation activation energy is affected by the deformation temperature, strain rate and deformation amount, the variation range is 119.0-173.2 kJ·mol-1, and the deformation activation energy decreases with the increasing of the deformation temperature and first decreases and then increases with the increasing of the strain rate.
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基金项目：
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国家自然科学青年基金项目（51905232）
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作者简介：
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作者简介：尹小燕（1984-），女，硕士，讲师，E-mail：297527795@qq.com
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