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Eutectoid Phase Transformations in Nb-Silicide In-Situ Composites

Published online by Cambridge University Press:  11 February 2011

B. P. Bewlay ,
S. D. Sitzman ,
L. N. Brewer  and
M. R. Jackson
B. P. Bewlay
Affiliation:
General Electric Global Research, Pasedena, CA 91104.
S. D. Sitzman
Affiliation:
Schenectady, NY 12301. HKL Technology Inc., Pasedena, CA 91104.
L. N. Brewer
Affiliation:
General Electric Global Research, Pasedena, CA 91104.
M. R. Jackson
Affiliation:
General Electric Global Research, Pasedena, CA 91104.
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Abstract

Nb-silicide based composites have excellent potential for future high-temperature structural applications. Nb-silicide composites possess Nb together with high-strength silicides, such as Nb5Si3 and Nb3Si. Alloying elements such as Ti and Hf, are added to obtain a balance of properties such as creep performance and oxidation resistance. In Nb-silicide composites generated from Nb-rich binary Nb-Si alloys, Nb3Si is unstable and experiences eutectoid decomposition to Nb and Nb5Si3. The present paper describes a low temperature eutectoid phase transformation during which (Nb)3Si decomposes into (Nb) and (Nb)5Si3, where the (Nb)5Si3 possesses the hP16 structure, as opposed to the tI32 structure observed in binary Nb5Si3.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 753: Symposium BB – Defect Properties and Related Phenomena in Intermetallic Alloys , 2002 , BB2.4
Copyright
Copyright © Materials Research Society 2003

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References

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