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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