Phase-field simulation of interdiffusion microstructure containing fcc-gamma and L1(2)-gamma ' phases in Ni-Al diffusion couples

    Authors

    R. R. Mohanty; A. Leon;Y. H. Sohn

    Comments

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    Abbreviated Journal Title

    Comput. Mater. Sci.

    Keywords

    nickel alloys; interdiffusion; microstructure; phase-field model; COMPUTER-SIMULATION; ELECTRON-MICROSCOPY; COARSENING KINETICS; SINGLE-PHASE; ALLOYS; NI3AL; PARTICLES; INTERFACE; COATINGS; Materials Science, Multidisciplinary

    Abstract

    Evolution of interdiffusion microstructures was examined for binary Ni-Al solid-to-solid diffusion couples using two-dimensional (2D) phase-field simulation. Utilizing semi-implicit Fourier-spectral solutions to Cahn-Hilliard and Allen-Cahn equations, multiphase diffusion couples of fee Ni solid solution gamma vs. L1(2) Ni3Al solid solution gamma', gamma vs. gamma + gamma', gamma + gamma' vs. gamma + gamma' with sufficient thermodynamic and kinetic database, were simulated with alloys of varying compositions and volume fractions of second phase (e.g., gamma' Chemical mobility as a function of composition was used in the study with constant gradient energy coefficient, and their effect on the final interdiffusion microstructure was examined. The microstructures were characterized by the type of boundaries formed, i.e. Type 0, Type I, and Type II, following various experimental observations in literature and thermodynamic considerations. Volume fraction profiles of alloy phases present in the diffusion couples were measured to quantitatively analyze the formation or dissolution of phases across the boundaries. Kinetics of dissolution of gamma' phase was found to be a function of interdiffusion coefficients that can vary with composition and temperature. (C) 2007 Elsevier B.V. All rights reserved.

    Journal Title

    Computational Materials Science

    Volume

    43

    Issue/Number

    2

    Publication Date

    1-1-2008

    Document Type

    Article

    Language

    English

    First Page

    301

    Last Page

    308

    WOS Identifier

    WOS:000258543400007

    ISSN

    0927-0256

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