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Diffusional transport during the cyclic oxidation of gamma + beta, Ni-Cr-Al(Y, Zr) alloysThe cyclic oxidation behavior of several cast gamma + beta, Ni-Cr-Al(Y, Zr) alloys and one low-pressure plasma spraying gamma + beta, Ni-Co-Cr-Al(Y) alloy was studied. Cyclic oxidation was found to result in a decreasing Al concentration at the oxide-metal interface due to a high rate of Al consumption coupled with oxide scale cracking and spalling. Diffusion paths plotted on the ternary phase diagram showed higher Ni concentrations with increasing cyclic oxidation exposures. The alloy with the highest rate of Al consumption and the highest Al content underwent breakaway oxidation following 500 1-hr cycles at 1200 C.
Document ID
19880041675
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
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
February 1, 1988
Publication Information
Publication: Oxidation of Metals
Volume: 29
ISSN: 0030-770X
Subject Category
Metallic Materials
Accession Number
88A28902
Funding Number(s)
CONTRACT_GRANT: NSG-3215
Distribution Limits
Public
Copyright
Other

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