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Abstract：
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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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Funds：
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国家自然科学青年基金项目（51905232）
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AuthorIntro：
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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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Reference：
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