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High Temperature Oxidation of β-NiAl

Published online by Cambridge University Press:  21 February 2011

Joseph K. Doychak ,
T. E. Mitchell  and
J. L. Smialek
Joseph K. Doychak
Affiliation:
Dept. of Metallurgy and Matl's Sci., Case Western Reserve University Cleveland, OH 44106
T. E. Mitchell
Affiliation:
Dept. of Metallurgy and Matl's Sci., Case Western Reserve University Cleveland, OH 44106
J. L. Smialek
Affiliation:
NASA Lewis Research Center, Cleveland, OH 44135
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Abstract

The oxidation of single crystal β-NiAl has been studied primarily using electron microscopy. Oriented metastable Al2O3 phases form during transient oxidation at 800°C. Specific orientation relationships exist on all metal orientations studied and are a result of the small mismatch along aligned close-packed directions in the cation sublattices of the metal and oxide. Transformation of the metastable Al2O3, phases at 1100°C results in an oxide morphology described as the “lacey” structure of α-Al2O3 scales. This structure results from impingement of oriented patchei α a-Al2O3 as the transformation initiates and moves radially parallel to the sugfhce. Scale growth occurs by diffusion along high angle grain boundaries. A drastic reduction in oxidation rate accompanies the change in oxide morphology.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 39: Symposium G – High-Temperature Ordered Intermetallic Alloys I , 1984 , 475
Copyright
Copyright © Materials Research Society 1985

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References

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