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The transient oxidation of single crystal NiAl+ZrThe 800 C oxidation of oriented single crystals of Zr doped beta-NiAl was studied using transmission electron microscopy. The oxide phases and metal-oxide orientation relationships were determined to characterize the transient stages of oxidation prior to the transformation to or formation of alpha-Al2O3. On (001) and (012) metal orientations, NiAl2O4 was the first oxide to form followed by delta-Al2O3 which becomes the predominant oxide phase. All oxides were highly epitaxially related to the metal; the orientation relationships being function of parallel cation close-packed directions in the meta and oxide. On (011) and (111) metal orientations, gamma-Al2O3 became the predominant oxide phase rather than delta-Al2O3, indicating a structural stability from the highly epitaxial oxides. The relative concentration of aluminum in the oxide scales increased with time indicating preferential gamma-or delta-Al2O3 growth. The striking feature common to the orientation relationships is the alignment of 100 m and 110 ox directions, believed to result from the minimal 3 percent mismatch between the corresponding (100)m and (110)ox planes.
Document ID
19850002913
Acquisition Source
Legacy CDMS
Document Type
Thesis/Dissertation
Authors
Doychak, J. K. (Case Western Reserve Univ. Cleveland, OH, United States)
Date Acquired
September 5, 2013
Publication Date
September 1, 1983
Subject Category
Metallic Materials
Report/Patent Number
NASA-CR-174756
NAS 1.26:174756
Accession Number
85N11221
Funding Number(s)
CONTRACT_GRANT: NAG3-58
PROJECT: RTOP 505-36-12
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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