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

    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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