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通过基于物理方法的本构方程研究2024和7075铝合金的热变形行为。研究温度对铝弹性模量和自扩散系数的影响。研究结果表明,为描述峰值流变应力,铝的晶格自扩散激活能(142 kJ/mol)可作为Zener-Hollomon参数方程的变形激活能,而改进双曲正弦函数中的理论指数可设为5。考虑基于物理的材料参数,可以对2024和7075铝合金的热流变应力进行对比研究。所采用的方法是一个通用工具,可用于热加工的对比研究和合金开发。
The thermal deformation behavior of 2024 and 7075 aluminum alloys was investigated by a physical method based constitutive equation. The effect of temperature on the elastic modulus and self-diffusion coefficient of aluminum was studied. The results show that the lattice self-diffusion activation energy (142 kJ / mol) of aluminum can be used as the deformation activation energy of the Zener-Hollomon parameter equation to describe the peak flow stress, and the theoretical index in the improved hyperbolic sine function can be set as 5. Considering physical-based material parameters, the heat flow stress of 2024 and 7075 aluminum alloys can be compared. The method used is a versatile tool that can be used for comparative studies and alloy development in thermal processing.