Predicting the onset of rafting of gamma ' precipitates by channel deformation in a Ni superalloy

N Ratel, H A Calderon, T Mori, P J Withers

    Research output: Contribution to journalArticlepeer-review

    Abstract

    The growth or shrinkage, normal to {001}, of the interfaces between the gamma matrix and cuboidal gamma ' precipitates is examined for a Ni-base superalloy, by considering the force acting on the interfaces. The force is produced by the precipitate coherency misfit and the stress produced by plastic deformation in channels of the gamma matrix. A simple expression, which directly addresses the origin of the surface force, is given. The plastic deformation within the initially active gamma matrix channels exerts the force to cause rafting. The subsequent activation of other types of channels also promotes the rafting in the same direction as the first active channels, when the plastic strain of the former channels increases. These issues are also discussed in terms of analysis based on those dislocations caused by the precipitate misfit and those produced by the plastic deformation.
    Original languageEnglish
    Pages (from-to)585-597
    Number of pages13
    JournalPhilosophical Magazine
    Volume90
    Issue number5
    DOIs
    Publication statusPublished - 2010

    Keywords

    • γ-γ′ alloy
    • Channel deformation
    • Force on interface
    • Rafting

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