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Oxidation Behavior of Ni Aluminides Using X-ray Absorption Spectroscopy

Published online by Cambridge University Press:  26 February 2011

R.B. Greegor  and
F.W. Lytle
R.B. Greegor
Affiliation:
The Boeing Company, Seattle, WA 98124
F.W. Lytle
Affiliation:
The Boeing Company, Seattle, WA 98124
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Abstract

XAS was used to investigate the oxidation behavior of Ni3Al aluminides with and without the addition of Cr. At 450 C the Cr formed a Cr2O3 like oxide layer which inhibited the oxidation of the Ni at the surface. Ni oxidation did occur in the sample without Cr at 450 C. At higher temperatures the Ni at the surface oxidized to NiO, but in the bulk no oxidation of the Ni was observed whether Cr was present or not. When no Cr was present a minimum was observed at 700 C in the fraction of oxidized Ni. The Cr (8at.%) did not cluster and substituted for Ni or Al in the Ni3Al aluminide.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 213: Symposium Q – High-Temperature Ordered Intermetallic Alloys IV , 1990 , 957
Copyright
Copyright © Materials Research Society 1991

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References

REFERENCES

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