Evaluating atomic mobility and interdiffusivity based on two-dimensional diffusion simulations and diffusion triple experiments. (November 2020)

• Record Type: Journal Article
• Authors: Xia, Cheng-Hui; Xia, Shi-Lin; Li, Ying; Lu, Xiao-Gang
• Is Part Of: Scripta materialia. Number 188(2020)
• Page Start: 124
• Page End: 129
• Publication Date: 2020-11
• Subjects: Two-dimensional simulation -- Diffusion triple -- Atomic mobility -- Interdiffusion coefficient; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2020.07.026
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: 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. Graphical abstract: Image, graphical abstract