In-situ electrical resistivity measurements for determining formation kinetics of gamma' phase in nickel-based wrought superalloys

G.I. Rosen, S.F. Dirnfeld, M. Bamberger, B. Prinz

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    Abstract

    Formation kinetics of γ′ (Ni3Al) phase in Ni-based wrought superalloys were investigated using the indirect measurement method of electrical resistivity change during isothermal holding. It was found that formation of γ′ phase occurs in a very short time (as a function of temperature and alloying level) by a diffusion controlled nucleation mechanism. Al alone enhances the formation of γ′ nuclei in the alloy and enlarges their quantity. On the other hand, addition of Ti or Ta causes delay in nucleation. Any other alloying addition (e.g. Co or W) delays the primary stage of nucleation. Ta was found to be more substantial than Ti in increasing nucleation rate and volume fraction of the γ′ phase.
    Original languageEnglish
    JournalZeitschrift fuer Metallkunde/Materials Research and Advanced Techniques
    Volume85
    Issue number2
    Pages (from-to)127-130
    ISSN0044-3093
    Publication statusPublished - 1994

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