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Fluorescence Imaging of the Aluminum Oxide Transformation on the Surface of Single Crystal (111) NiAl

Published online by Cambridge University Press:  15 February 2011

H. E. Schaffer ,
D. M. Lipkin ,
F. Adar  and
D. R. Clarke
H. E. Schaffer
Affiliation:
Instruments, SA, 3880 Park Avenue, Edison, NJ 08820, [email protected]
D. M. Lipkin
Affiliation:
Materials Department, College of Engineering, University of California, Santa Barbara, CA 93106–5050, [email protected]
F. Adar
Affiliation:
Instruments, SA, 3880 Park Avenue, Edison, NJ 08820, [email protected]
D. R. Clarke
Affiliation:
Materials Department, College of Engineering, University of California, Santa Barbara, CA 93106–5050, [email protected]
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Abstract

Microscopic examination of the surface of single crystal (111) NiAl during various stages of oxidation at 1100 C in air shows the development of islands composed of rings of different colors.These islands appear to grow in size and eventually impinge with increased exposure. Microscopic fluorescence mapping of the surfaces of three single crystals subjected to varied exposure times provides an identification of the composition of the islands and the surrounding area as two different allotropes of alurninum oxide.Additionally, analysis of the map spectra demonstrates the decrease of intensity of their characteristic fluorescence bands in the island centers with increasing island size, which we refer to as “volcanic” intensity topography. Thus, the observed color variation is an interference effect, due to varied films thicknesses through the islands. Finally, the energies of the fluorescent bands are seen to shift as a function of distance from the island center, indicating the development of strain gradients across the islands.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 440: Symposia CA – Structure and Evolution of Surfaces , 1996 , 121
Copyright
Copyright © Materials Research Society 1997

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References

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