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  • 1
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    Role of cobalt in nickel base superalloys (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The effect of cobalt or substituting for cobalt on the mechanical properties of nickel-based superalloys is discussed. Waspaloy, UDIMET 700, and NIMONIC 115, which are representative of Ni-Cr-Co-Al-Ti-Mo superalloys having different gamma prime contents which are strengthened by a heavily alloyed matrix, coherent gamma prime precipitates, and carbides at the grain boundaries. Microstructure and in situ and extracted phase STEM micro-analysis were used to evaluate the three alloys.
    Keywords: METALLIC MATERIALS
    Type: NASA. Lewis Research Center COSAM (Conserv. Of Strategic Aerospace Mater.) Program Overview; p 37-62
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Modeling of gamma/gamma-prime phase equilibrium in the nickel-aluminum system (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: A theoretical model is proposed for the determination of phase equilibrium in alloys, taking into consideration dissimilar lattice parameters. Volume-dependent pair interactions are introduced by means of phenomenological Lennard-Jones potentials and the configurational entropy of the system is treated in the tetrahedron approximation of the cluster variation method. The model is applied to the superalloy-relevant, nickel-rich, gamma/gamma-prime phase region of the Ni-Al phase diagram. The model predicts reasonable values for the lattice parameters and the enthalpy of formation as a function of composition, and the calculated phase diagram closely approximates the experimental diagram.
    Keywords: METALLIC MATERIALS
    Type: Acta Metallurgica (ISSN 0001-6160); 32; 1519-152
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Superalloy composition modeling (1982)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: Development of a predictive method for determination of the gamma/gamma prime phase fields, i.e., gamma prime volume fraction as a function of the multicomponent composition, is described. The cluster variation method used for binary alloys in which the precipitated phase is coherent with the matrix phase is extended for application to the multicomponent coherent gamma/gamma prime nickel-based superalloys. It is shown that the cluster variation method can accurately describe the equilibrium (incoherent) gamma/gamma prime phase fields in the binary Ni-Al phase diagram. The gamma/gamma prime phase field for the Ni-Cr-Al ternary phase diagram is computed as a function of temperature. A reasonable fit results between the calculated and the experimental diagrams. The modeling of the six-component Ni-Cr-Al-Co-Mo-Ti base superalloy and the effect of Ni substitution of Co are discussed.
    Keywords: METALLIC MATERIALS
    Type: NASA. Lewis Research Center COSAM (Conserv. Of Strategic Aerospace Mater.) Program Overview; p 13-19
    Format: text
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    NASA TECHNICAL REPORTS
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