Hostname: page-component-745bb68f8f-f46jp Total loading time: 0 Render date: 2025-01-12T11:48:20.402Z Has data issue: false hasContentIssue false
  • English
  • Français

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.
Get access

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

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

1. Mendiratta, M.G. and Dimiduk, D.M., Mat. Res. Soc. Symp. Proc., 133 (1989), pp. 441–447.Google Scholar
2. Dimiduk, D.M., Mendiratta, M.G. and Subramanian, P.R., in Structural Intermetallics, Eds. Darolia, R., Lewandowski, J.J., Liu, C.T., Martin, P.L., Miracle, D.B., and Nathal, M.V., TMS Publications, Warrendale, Pa., (1993), pp. 619–630.Google Scholar
3. Jackson, M.R., Bewlay, B.P., Rowe, R.G., Skelly, D.W., and Lipsitt, H.A., J. of Metals 48 (1), (1996), pp. 39–45.Google Scholar
4. Cockeram, B., Lipsitt, H.A., Srinivasan, R. and Weiss, I., Scripta Met. and Mater., 25 (1991), pp. 2109–2114.Google Scholar
5. Mendiratta, M.G. and Dimiduk, D.M., Scripta Metall. Mater., 25 (1991), pp. 237–242.CrossRefGoogle Scholar
6. Massalski, T., Binary Alloy Phase Diagrams, ASM Metals Park, Ohio (1992).Google Scholar
7. Subramanian, D.R., Mendiratta, M.G. and Dimiduk, D.M., Mat. Res. Soc. Symp. Proc., 322 (1994), pp. 491–502.Google Scholar
8. Bewlay, B.P., Jackson, M.R., and Lipsitt, H.A., J. Phase Equilibria, 18(3) (1997), pp. 264–278.Google Scholar
9. Bewlay, B.P., Jackson, M.R., Reeder, W.J., and Lipsitt, H.A. Mat. Res. Soc. Symp. Proc., 364 (1994), pp. 943–948.Google Scholar