Inter-diffusion Behavior Of Ce-Al-Ni Alloy Melts

As a typical amorphous alloy,Ce-based amorphous alloy has unique physical properties and low glass transition temperature,which is one of the important research topics in the field of molten metal diffusion.Studying the atomic diffusion behavior of Ce-based binary alloy melts and ternary alloy melts will also greatly help us to study the characteristics of Ce-based amorphous alloys from the perspectives of liquid structure,thermodynamics and kinetics.Combined with the high-vacuum metal melt atomic diffusion measurement system,the existing measurement device was improved.A new type of melt atomic diffusion coefficient measurement system was designed.It improved the efficiency and the success rate of the experiment.This technique was used to measure the composition of typical Ce-based alloys:the diffusion coefficient of Ce₈₀Al₂₀ alloy melt,Ce₈₀Ni₂₀ alloy melt and Ce₇₀Al₁₀Ni₂₀ alloy melt.In the Ce-based binary alloy melt,the measured experimental data is fitted by Gaussian error function to obtain the diffusion coefficient at the corresponding temperature point.The comparison between the measured valuesin this paper and the results of previous studies and measurements also shows the advantages and reliability of this technology.The relationship of the interdiffusion coefficient of Ce₇₀Al₁₀Ni₂₀ amorphous alloy melt with time was studied using multi-layer translational shear technology.Combined with the global optimization algorithm,the mutual diffusion coefficient matrix of the ternary alloy melt is obtained.The influence of thermodynamics on atomic interdiffusion behavior in ternary alloy melt is analyzed.The relationship between the diffusion coefficients of each atom in the melt with time is investigated,and the main diffusion coefficients conform to the Arrhenius relation on the whole trend.The self-diffusion coefficients of the Ce₈₀Al₂₀ alloy melt and Ce₇₀Al₁₀Ni₂₀ alloy melt are calculated by first-principles molecular dynamics simulation.The results of experimental measurements are combined with the Darken formula to analyze the diffusion behavior of Ce-based alloy melts,and the relationship between interdiffusion and self-diffusion of atoms in the melt is studied.The approximate value of the self-diffusion coefficient of the ternary alloy system was also obtained through the inverse calculation of the Darken formula,which explored a new idea for the study of the self-diffusion coefficient of the ternary alloy system.