Title

Phase-field investigation of multicomponent diffusion in single-phase and two-phase diffusion couples

Authors

Authors

R. R. Mohanty;Y. Sohn

Comments

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Abbreviated Journal Title

J. Phase Equilib. Diffus.

Keywords

computation; interdiffusion; microstructure; multicomponent diffusion; phase field modeling; thermodynamics; zero flux planes; ZERO-FLUX PLANES; NI-ZN SYSTEM; REVERSALS; 775-DEGREES-C; MOTION; MODEL; Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy &; Metallurgical Engineering

Abstract

Interdiffusion in hypothetical ternary single-phase and two-phase diffusion couples are examined using a phase-field model by numerically solving the nonlinear Cahn-Hilliard and Ginzburg-Landau equations. For diffusion couples assembled with a regular single-phase solution, constant chemical mobilities were used to examine the development of concentration profiles including uphill diffusion and zero-flux plane. Zero-flux plane for a component was observed to develop for a diffusion couple at the composition that corresponds to the activity of that component in one of the terminal alloys. Experimental thermodynamic parameters and composition-dependent chemical mobilities were used to examine the morphological evolution of the interphase boundary in solid-to-solid, two-phase diffusion couples. Instability at the interphase boundary was introduced initially (t = 0) by a small compositional fluctuation at the diffuse interface, and its evolution varied largely as a function of terminal alloys and related composition-dependent chemical mobility.

Journal Title

Journal of Phase Equilibria and Diffusion

Volume

27

Issue/Number

6

Publication Date

1-1-2006

Document Type

Article; Proceedings Paper

Language

English

First Page

676

Last Page

683

WOS Identifier

WOS:000242471200018

ISSN

1547-7037

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