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Predicting diffusion paths and interface motion in gamma/gamma + beta, Ni-Cr-Al diffusion couplesA simplified model has been developed to predict Beta recession and diffusion paths in ternary gamma/gamma + beta diffusion couples (gamma:fcc, beta: NiAl structure). The model was tested by predicting beta recession and diffusion paths for four gamma/gamma + beta, Ni-Cr-Al couples annealed for 100 hours at 1200 C. The model predicted beta recession within 20 percent of that measured for each of the couples. The model also predicted shifts in the concentration of the gamma phase at the gamma/gamma + beta interface within 2 at. pct Al and 6 at. pct Cr of that measured in each of the couples. A qualitative explanation based on simple kinetic and mass balance arguments has been given which demonstrates the necessity for diffusion in the two-phase region of certain gamma/gamma + beta, Ni-Cr-Al couples.
Document ID
19880037259
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Nesbitt, J. A.
(NASA Lewis Research Center Cleveland, OH, United States)
Heckel, R. W.
(Michigan Technological University Houghton, United States)
Date Acquired
August 13, 2013
Publication Date
December 1, 1987
Publication Information
Publication: Metallurgical Transactions A - Physical Metallurgy and Materials Science
Volume: 18A
ISSN: 0360-2133
Subject Category
Metallic Materials
Accession Number
88A24486
Funding Number(s)
CONTRACT_GRANT: NAG3-244
Distribution Limits
Public
Copyright
Other

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