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Evaluating atomic mobility and interdiffusivity based on two-dimensional diffusion simulations and diffusion triple experiments
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DOI：10.1016/j.scriptamat.2020.07.026.png)
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Abstract
En 中文
Diffusion triples or multiples are commonly considered as high-throughput experiments to study phase equilibrium and diffusion. But when extracting diffusion coefficients, they are treated as diffusion couples with one-dimensional (1D) composition variation, never taking advantage of their two-dimensional (2D) composition distributions. In this work, we present an efficient numerical inverse approach to directly evaluate composition-dependent atomic mobilities and full matrix of interdiffusivities based on a novel 2D diffusion simulation scheme, which was applied to the Co-Fe-Ni alloys by analyzing only one diffusion triple over a wide composition range. Its reliability was confirmed by comparing with traditional methods. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
Keywords:
Two-dimensional simulation
Diffusion triple
Atomic mobility
Interdiffusion coefficient
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