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Adherent Al2O3 scales produced on undoped NiCrAl alloysRepeated oxidation and polishing of high purity Ni-15Cr-13Al has dramatically changed its cyclic oxidation behavior from nonadherent to adherent. No apparent change in scale phase, morphology or interface structure occurred during this transition, dismissing any mechanism based on pegging, vacancy sink, or growth stress. The principle change that did occur was a reduction in the sulfur content from 10 ppmw to 3 ppmw after 25 cycles at 1120 C. These observations are used to support the model of Al2O3 scale adherence put forth by Smeggil et al. which claims that Al2O3 scale spallation occurs due to sulfur segregation and bond deterioration at the oxide-metal interface.
Document ID
19880043042
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Smialek, James L.
(NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
August 13, 2013
Publication Date
October 1, 1986
Subject Category
Metallic Materials
Accession Number
88A30269
Distribution Limits
Public
Copyright
Other

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