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扩散系数是描述液态金属动力学性质的关键物理量,也是金属材料设计与成型的必要参数.本文利用滑动剪切技术和中子散射技术分别测量了Ce80Cu20合金熔体互扩散系数和Cu原子的自扩散系数,两种扩散系数随温度的变化在所研究的温度范围均符合经典的Arrhenius关系.互扩散系数激活能与Cu原子自扩散系数激活能非常接近,互扩散系数绝对值大约是Cu自扩散系数的1.5倍.根据吉布斯自由能数据,本文还计算了该合金熔体互扩散的热力学驱动力(即热力学因子).结合计算的热力学因子以及经典的描述自扩散和互扩散关系的Darken方程,本文讨论了Ce80Cu20合金熔体中自扩散系数和互扩散系数之间的关系.
The diffusion coefficient is the key physical parameter to describe the dynamic properties of liquid metal and is also the necessary parameter for the design and forming of metal materials.In this paper, the mutual diffusion coefficient and the self-diffusion of Cu atoms in Ce80Cu20 alloy were measured by using the sliding shear technique and neutron scattering technique Coefficient and temperature coefficient of the two diffusion coefficients all fit the classical Arrhenius relation in the studied temperature range.The activation energy of interdiffusion coefficient is very close to the activation energy of self-diffusion coefficient of Cu atom, and the absolute value of inter-diffusion coefficient is about Cu self-diffusion coefficient 1.5 times of the melting temperature.According to the Gibbs free energy data, this paper also calculated the thermodynamic driving force (ie, thermodynamic factor) of the alloy melt interdiffusion.Combined with the calculated thermodynamic factor and the classic Darken equation describing the relationship between self-diffusion and interdiffusion , This paper discusses the relationship between self-diffusion coefficient and inter-diffusion coefficient in Ce80Cu20 alloy melt.