Microstructural degradation of aluminide coatings on single crystal nickel based superalloys during high temperature exposure

W.F. Gale, J.E. King

    Research output: Contribution to journalArticle

    Abstract

    An investigation, employing edge-on transmission electron microscopy, of the microstructure of aluminide diffusion coatings on a single crystal y' strengthened nickel base super alloy is reported. An examination has been made of the effect of postcoating exposure at 1100°C on the stability of the coating matrix, a B2 type phase, nominally NiAl. Precipitation in the coating is considered with respect to both decomposition of the B2 matrix to other Ni-Al (plus titanium) phases and the formation of chromium bearing precipitates. A comparison is drawn with behaviour at lower temperatures (850-950°C). © 1995 The Institute of Materials.
    Original languageEnglish
    Pages (from-to)793-798
    Number of pages6
    JournalMaterials Science and Technology
    Volume9
    Issue number9
    Publication statusPublished - Sep 1993

    Keywords

    • aluminide coating
    • aluminide diffusion coatings
    • high-temperature exposure
    • matrix
    • microstructural degradation
    • single crystal nickel based superalloy
    • chromium
    • crystal microstructure
    • diffusion coatings
    • single crystals
    • superalloys
    • titanium
    • transmission electron microscopy
    • nickel coatings

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