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Determination of the Effect of Hf Additions on Phase Stability in Nb-Silicide Based In-Situ Composites

Published online by Cambridge University Press:  10 February 2011

B. P. Bewlay ,
J.-C. Zhao ,
M. R. Jackson  and
R. R. Bishop
B. P. Bewlay
Affiliation:
General Electric Company, Corporate Research and Development, Schenectady, New York 12301.
J.-C. Zhao
Affiliation:
General Electric Company, Corporate Research and Development, Schenectady, New York 12301.
M. R. Jackson
Affiliation:
General Electric Company, Corporate Research and Development, Schenectady, New York 12301.
R. R. Bishop
Affiliation:
General Electric Company, Corporate Research and Development, Schenectady, New York 12301.
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Abstract

In-situ composites based on Nb-Si alloys are potential candidates for application as structural materials in future aircraft engines. In order to achieve the balance of properties that is required, additional alloying species, such as Ti, Hf, Mo, Cr, Al, are employed. The present paper describes the effect of Hf additions on phase stability of Nb-Si alloys. Liquid-solid and solid-state phase equilibria have been investigated. The Nb-Hf-Si liquidus surface and the isothermal section at 1500°C will be described. A broad range of Nb and Hf compositions were investigated for Si concentrations up to 35.0%.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 552: Symposium KK – High-Temperature Ordered Intermetallic Alloys VIII , 1998 , KK6.8.1
Copyright
Copyright © Materials Research Society 1999

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References

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