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Thermodynamic Modeling and Solidification Simulation of Ti-Al-Cr alloys

Published online by Cambridge University Press:  03 March 2011

Y. Yang ,
B.P. Bewlay  and
Y.A. Chang
Y. Yang
Affiliation:
CompuTherm LLC, Madison, Wisconsin 53719, USA
B.P. Bewlay
Affiliation:
General Electric Global Research, Schenectady, New York 12301, USA
Y.A. Chang
Affiliation:
University of Wisconsin-Madison, Madison, Wisconsin 53706, USA
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Abstract

Titanium aluminide based alloys are candidate materials for high temperature structural applications. They are typically alloyed with elements such as Nb, Ta, Mo, Cr and B for property enhancement. To understand the relationship between microstructure and alloy composition/processing condition, detailed models of phase equilibria in multicomponent Ti-Al based alloys are needed. In this work, we developed thermodynamic models for the phases in the Ti-Al-Cr system based on critically assessed binary models and ternary experimental data in literature, using the CALPHAD approach. Isothermal sections at 1200, 1150, 1000 and 800°C, and the liquidus projection, were calculated from the currently developed thermodynamic models; these are in satisfactory agreement with experimental data. Isopleths were calculated at specified Cr concentrations, and solidification paths were simulated under the Scheil conditions for a range of Ti-Al-Cr alloys. From the calculated phase diagrams and solidification paths, the effect of Cr on the microstructure of Ti-Al alloys can be understood.

Keywords

CrAlTi
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1295: Symposium N – Intermetallic-Based Alloys for Structural and Functional Applications , 2011 , mrsf10-1295-n03-04
Copyright
Copyright © Materials Research Society 2011

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