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Modeling of gamma/gamma-prime phase equilibrium in the nickel-aluminum systemA 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.
Document ID
19850032808
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Sanchez, J. M.
(Columbia Univ. New York, NY, United States)
Barefoot, J. R.
(Columbia Univ. New York, NY, United States)
Jarrett, R. N.
(Columbia Univ. New York, NY, United States)
Tien, J. K.
(Columbia University New York, NY, United States)
Date Acquired
August 12, 2013
Publication Date
September 1, 1984
Publication Information
Publication: Acta Metallurgica
Volume: 32
ISSN: 0001-6160
Subject Category
Metallic Materials
Accession Number
85A14959
Funding Number(s)
CONTRACT_GRANT: NSF DMR-82-06195
CONTRACT_GRANT: NAG3-57
Distribution Limits
Public
Copyright
Other

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