Evaluating atomic mobility and interdiffusivity based on two-dimensional diffusion simulations and diffusion triple experiments

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-dimen...

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Bibliographic Details
Published in:Scripta materialia 2020-11, Vol.188, p.124-129
Main Authors: Xia, Cheng-Hui, Xia, Shi-Lin, Li, Ying, Lu, Xiao-Gang
Format: Article
Language:English
Subjects:
Atomic mobility
Diffusion triple
Interdiffusion coefficient
Two-dimensional simulation
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Summary: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. [Display omitted]
ISSN:1359-6462
1872-8456
DOI:10.1016/j.scriptamat.2020.07.026