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Adherent Al2O3 scales formed on undoped NiCrAl alloysChanges in the spalling behavior of Al2O3 scales formed on an undoped NiCrAl alloy are described. Two samples of Ni-15Cr-13Al (wt pct), one a control and the other sanded, were subjected to 25 oxidation cycles. It is observed that adherent scales formed on the sanded sample; however, the control sample had speckled, spalled scales. The data reveal that the adherent scales are caused by repeated removal of surface layers after each oxidation cycle. It is determined that interfacial segregation of sulfur influences spallation and sulfur removal increases bonding. The effect of moisture on scale adhesions is investigated.
Document ID
19870044771
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Smialek, James L.
(NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
August 13, 2013
Publication Date
January 1, 1987
Publication Information
Publication: Metallurgical Transactions A - Physical Metallurgy and Materials Science
Volume: 18A
ISSN: 0360-2133
Subject Category
Metallic Materials
Accession Number
87A32045
Distribution Limits
Public
Copyright
Other

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