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The gamma-gamma prime region of the Ni-Al-Cr-Ti-W-Mo system at 850°C

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Abstract

An investigation was conducted to determine the compositional limits of γ and γ′ phases in nickel-base superalloys. Fifty-one nickel-base alloys were melted under vacuum and heat treated for 4 h at 1190°C followed by 1008 h at 850°C. The alloys had the following composition ranges in at. pct: Al 4.0 to 13, Cr 6.5 to 20.5, Ti 0.25 to 4.75, Mo 0.0 to 6.0, and W 0.0 to 4.0. The residues from the ammonium sulfate electrolytic extraction for the two phase alloys were analyzed chemically and by X-ray diffraction. The results of the exper-imentally determined compositions of γ′ were used to calculate γ compositions. The solvus hypersurfaces were fitted with an equation of the third degree. A computer program was written which calculates the composition of conjugate γ and γ′ from the composition of a two phase alloy by locating the intersection of a tie line and the solvus hypersurface. The results of the calculation compare well with experimental results for this investigation and for at least one phase of 15 commercial Ni-base superalloys.

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Authors and Affiliations

  1. NASA Lewis Research Center, 44106, Cleveland, Ohio

    R. L. Dreshfield (Metallurgist)

  2. Case Western Reserve University, 44106, Cleveland, Ohio

    J. F. Wallace (Professor of Metallurgy)

Authors
  1. R. L. Dreshfield
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  2. J. F. Wallace
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Additional information

This paper describes work performed at Case Western Reserve University in partial fulfillment of the requirement for the Ph.D. degree.

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Dreshfield, R.L., Wallace, J.F. The gamma-gamma prime region of the Ni-Al-Cr-Ti-W-Mo system at 850°C. Metall Trans 5, 71–78 (1974). https://doi.org/10.1007/BF02642929

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  • DOI: https://doi.org/10.1007/BF02642929

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