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Effect of Cr Addition on the Phase Equilibria of the Nb-Si System

Published online by Cambridge University Press:  26 February 2011

B. P. Bewlay ,
Y. Yang ,
R. L. Casey ,
M. R. Jackson  and
Y. A. Chang
B. P. Bewlay
Affiliation:
bewlay@crd.ge.comGE Global Research CenterSchenectady NY 12301United States
Y. Yang
Affiliation:
Ying.Yang@computherm.com, CompuTherm LLC, 437 S. Yellowstone Dr., Madison, WI, 53719, United States
R. L. Casey
Affiliation:
caesey@crd.ge.com, GE Global Research Center, Schenectady, NY, 12301, United States
M. R. Jackson
Affiliation:
jackson@crd.ge.com, GE Global Research Center, Schenectady, NY, 12301, United States
Y. A. Chang
Affiliation:
chang@engr.wisc.edu, University of Wisconsin-Madison, Madison, WI, 53706, United States
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Abstract

Nb-silicide based in-situ composites are promising materials for future high-temperature structural applications. Nb-silicide composites are typically alloyed with Hf, Ti, Cr, and Al to provide a balance of mechanical and environmental properties. A thermodynamic description of the Nb-Cr-Si system has been developed previously in literature based on reported isothermal sections. According to the previously calculated phase diagrams, selected alloys were directionally solidified. The as-solidified microstructures could not be interpreted using the liquidus projection calculated from the existing thermodynamic descriptions. Therefore, an improved thermodynamic description was developed by incorporating the new experimental data.

Keywords

phase equilibriacompositealloy
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 980: Symposium II – Advanced Intermetallic-Based Alloys , 2006 , 0980-II05-34
Copyright
Copyright © Materials Research Society 2007

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References

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