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Protective Al2O3 scale formation on NbAl3-base alloysThe oxidation of NbAl3 with additions of Cr and Y was studied to determine the mechanisms of the beneficial effects of these elements upon oxidation. Cr additions to the binary NbAl3 alloy of up to 6.8 at. percent reduced the scale growth rates and promoted alpha-Al2O3 formation over much longer times relative to binary NbAl3. A major effect of Cr is to form a layer of AlNbCr at the metal/scale interface, which is inherently more oxidation-resistant than the matrix alloy in the long term. Yttrium additions to a Cr-containing alloy improved the scale growth rate and adherence and changed the scale microstructure to mimic that of a typical protective Al2O3 scale.
Document ID
19920049226
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Doychak, J.
(NASA Lewis Research Center Cleveland, OH, United States)
Hebsur, M. G.
(NASA Lewis Research Center Cleveland; Sverdrup Technology, Inc., Brook Park, OH, United States)
Date Acquired
August 15, 2013
Publication Date
August 1, 1991
Publication Information
Publication: Oxidation of Metals
Volume: 36
ISSN: 0030-770X
Subject Category
Metallic Materials
Accession Number
92A31850
Distribution Limits
Public
Copyright
Other

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