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Experimental Investigation and Thermodynamic Modeling of Phase Equilibria in the Hf-Ti-Si System

Published online by Cambridge University Press:  26 February 2011

Y. Yang ,
B. P. Bewlay ,
M. R. Jackson  and
Y. A. Chang
Y. Yang
Affiliation:
University of Wisconsin-Madison, Wisconsin 53706., USA.
B. P. Bewlay
Affiliation:
General Electric Global Research, Schenectady, New York 12301., USA
M. R. Jackson
Affiliation:
General Electric Global Research, Schenectady, New York 12301., USA
Y. A. Chang
Affiliation:
University of Wisconsin-Madison, Wisconsin 53706., USA.
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Abstract

Phase equilibria in ternary Hf-Ti-Si alloys were studied in the as-solidified and heat treated conditions using scanning electron microscopy, x-ray diffraction, and electron beam microprobe analysis. Selected solid-solid phase equilibria at 1350°C and a partial liquidus projection of the Hf-Ti-Si system at the metal rich end of the phase diagram were established. These data were then used to develop a thermodynamic description of the Hf-Ti-Si system using the CALPHAD (CALculation of PHAse Diagram) approach. The calculated isothermal section at 1350°C and the liquidus projection can satisfactorily account for the available experimental phase equilibria data and solidification paths. Both the calculations and the experimental data suggested that the metal-rich end of the ternary phase diagram possesses one transition reaction: L + (Hf, Ti)5Si3 → Hf(Ti)2Si + β(Hf, Ti, Si).

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 842: Symposium S – Integrative and Interdisciplinary Aspects of Intermetallics , 2004 , S5.30
Copyright
Copyright © Materials Research Society 2005

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References

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