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Stress-Driven Wrinkling oF α-Alumina Films Grown oN Fe-Cr-Al by Thermal Oxidation

Published online by Cambridge University Press:  10 February 2011

Vladimir K. Tolpygo  and
David R. Clarke
Vladimir K. Tolpygo
Affiliation:
Materials Department, University of California at Santa Barbara, Santa Barbara, CA 93106-5050, USA
David R. Clarke
Affiliation:
Materials Department, University of California at Santa Barbara, Santa Barbara, CA 93106-5050, USA
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Abstract

A thin α-Al2O3 film forms on Fe-20w/oCr-5w/oAl alloys when they are heated in air to about 1000°C. This thermally grown oxide exhibits a wrinkled morphology within minutes and with an amplitude and characteristic wavelength that increases with oxidation time. Measurements of the residual strain in the oxide, using Cr3+ photoluminescence piezospectroscopy, indicate that the wrinkling is associated with stress relaxation during the course of the thickening of the oxide. AFM and piezospectroscopic measurements reveal a strong time dependence of the growth stress and oxide wrinkling, as well as a marked dependence on the crystallographic orientation of the underlying Fe-Cr-Al substrate. Small additions (about 0.3 w/o) of yttrium to the metal completely suppress the wrinkling phenomenon although it is found not to lessen the growth stresses in the oxide film.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 441: Thin Films – Structure and Morphology , 1996 , 397
Copyright
Copyright © Materials Research Society 1997

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