Interdiffusion analysis for NiAl versus superalloys diffusion couples

    Authors

    E. Perez; T. Patterson;Y. Sohn

    Comments

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    Abbreviated Journal Title

    J. Phase Equilib. Diffus.

    Keywords

    coatings; diffusion coefficients; interdiffusion; multicomponent; multiphase; superalloys; AL-Y COATINGS; ALUMINIDE COATINGS; CYCLIC OXIDATION; ALLOYS; DEGRADATION; TRANSPORT; BEHAVIOR; FAILURE; Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy &; Metallurgical Engineering

    Abstract

    Solid-to-solid diffusion couples, beta-NiAl (B2) versus various commercial superalloys (i.e., CM247, GTD-111, IN-939, IN-718, and Waspalloy) were examined to quantify the rate of Al interdiffusion as a function of initial superalloy composition. The diffusion couples were assembled with Invar steel jig encapsulated in Ar by sealing in quartz capsules and annealed at 1050 degrees C for 96 h. Concentration profiles measured by electron probe microanalysis in the single-phase beta-NiAl region were used to determine interdiffusion fluxes and effective interdiffusion coefficients of individual components in the single-phase beta-NiAl side of the couple. The values determined using experimental concentration profiles of the single-phase beta-NiAl side of the couple were used to predict effective interdiffusion coefficients in multiphase superalloy side of the couple based on mass balance and local continuity of interdiffusion fluxes. Microstructural and compositional stability of protective coatings (e.g., NiCoCrAlY and NiAl) as a function of superalloys composition are discussed based on effective interdiffusion coefficients predicted from diffusion couple studies.

    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

    659

    Last Page

    664

    WOS Identifier

    WOS:000242471200015

    ISSN

    1547-7037

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