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On the Formation of Silicide Precipitates in Niobium-Silicide Based Composites

Published online by Cambridge University Press:  10 February 2011

B. P. Bewlay ,
R. J. Grylls  and
H. L. Fraser
B. P. Bewlay
Affiliation:
GE Corporate Research and Development, Niskayuna, NY 12309, USA.
R. J. Grylls
Affiliation:
GE Aircraft Engines, 1 Neumann Way M85, Cincinnati, OH 45215, USA.
H. L. Fraser
Affiliation:
Dept. of Materials Science and Engineering, Ohio State University, Coloumbus, OH 43210, USA.
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Abstract

Composites based on Nb-Si are attractive candidates for use as structural materials at the very high temperatures required for future aircraft engines. The composites described were produced by directional solidification, which gives a microstructure consisting of Nb dendrites with an Nb3Si-Nb eutectic. The aim of this paper is to provide a detailed characterization of precipitates observed in the Nb dendrites in both binary and higher-order alloys. The precipitates possess the Nb3Si stoichiometry, but not the stable Nb3Si structure. The precipitates form a metastable orthorhombic crystal structure which is related to the Nb matrix via a simple orientation relationship.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 552: Symposium KK – High-Temperature Ordered Intermetallic Alloys VIII , 1998 , KK5.27.1
Copyright
Copyright © Materials Research Society 1999

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References

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