Assessing the assumption of non-Reliance of concentration-dependent interdiffusion coefficient on maximum component concentration

IF 3.8 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Vacuum Pub Date : 2024-11-22 DOI:10.1016/j.vacuum.2024.113860

Soheil Shaker, Samuel Afolabi, Olanrewaju Ojo

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Abstract

It is generally assumed that the concentration dependence of the interdiffusion coefficient is a constant material parameter under isothermal conditions, unaffected by the maximum component concentration. Consequently, it is expected that the interdiffusion coefficient obtained from pure-metal/pure-metal diffusion couples can be used to predict diffusion effects, such as concentration profiles in alloy/pure-metal or alloy/alloy diffusion couples within the same binary alloy system, regardless of the maximum component concentration and vice versa. However, this non-trivial assumption neglects the potential influence of diffusion-induced stress on the concentration-dependent interdiffusion coefficient, D(C). This study assesses this assumption, and the results show that predicted concentration profiles based on this common assumption grossly fail to match experimental data. The findings demonstrate that using a constant D(C), irrespective of the maximum component concentration, in the prediction and analysis of diffusion effects can lead to significant errors.

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评估浓度依赖互扩散系数对最大组分浓度不依赖的假设

一般认为，在等温条件下，相互扩散系数的浓度依赖关系是一个恒定的材料参数，不受最大组分浓度的影响。因此，从纯金属/纯金属扩散偶中获得的互扩散系数可以用来预测扩散效应，例如在同一二元合金体系中合金/纯金属或合金/合金扩散偶中的浓度分布，而不考虑最大组分浓度，反之亦然。然而，这种非平凡的假设忽略了扩散诱导应力对浓度相关的互扩散系数D(C)的潜在影响。本研究对这一假设进行了评估，结果表明，基于这一普遍假设的预测浓度曲线与实验数据严重不符。研究结果表明，在预测和分析扩散效应时，使用恒定的D(C)，而不考虑最大组分浓度，会导致显著的误差。

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来源期刊

Vacuum 工程技术-材料科学：综合

CiteScore

6.80

自引率

17.50%

发文量

审稿时长

34 days

期刊介绍： Vacuum is an international rapid publications journal with a focus on short communication. All papers are peer-reviewed, with the review process for short communication geared towards very fast turnaround times. The journal also published full research papers, thematic issues and selected papers from leading conferences. A report in Vacuum should represent a major advance in an area that involves a controlled environment at pressures of one atmosphere or below. The scope of the journal includes: 1. Vacuum; original developments in vacuum pumping and instrumentation, vacuum measurement, vacuum gas dynamics, gas-surface interactions, surface treatment for UHV applications and low outgassing, vacuum melting, sintering, and vacuum metrology. Technology and solutions for large-scale facilities (e.g., particle accelerators and fusion devices). New instrumentation ( e.g., detectors and electron microscopes). 2. Plasma science; advances in PVD, CVD, plasma-assisted CVD, ion sources, deposition processes and analysis. 3. Surface science; surface engineering, surface chemistry, surface analysis, crystal growth, ion-surface interactions and etching, nanometer-scale processing, surface modification. 4. Materials science; novel functional or structural materials. Metals, ceramics, and polymers. Experiments, simulations, and modelling for understanding structure-property relationships. Thin films and coatings. Nanostructures and ion implantation.