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Thermodynamic Stability of Ordered Intermetallic Compound Phases

Published online by Cambridge University Press:  28 February 2011

Y. Austin Chang ,
Joachim P. Neumann  and
Shuang-Tin Chen
Y. Austin Chang
Affiliation:
Department of Materials Science and Engineering, University of Wisconsin, Madison, WI 53706
Joachim P. Neumann
Affiliation:
Materials Department, College of Engineering and Applied Science, University of Wisconsin-Milwaukee, Milwaukee, WI 53201
Shuang-Tin Chen
Affiliation:
Department of Materials Science and Engineering, University of Wisconsin, Madison, WI 53706
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Abstract

The Wagner-Schottky model was used to describe the thermodynamic behavior of ordered intermetallic compound phases. To demonstrate the utility of the approach, the models developed for triple-defect B2 (and B32) and anti-structure L10 phases were used to describe the thermodynamic properties of β-AlLi and γ-TiAl respectively. Since any potential engineering materials to be developed on the basis of intermetallics will be multi-component systems, the methodology was extended to describe the thermodynamic properties of ternary intermetallics. The ternary Ti-Mo-Al system was used as an example for discussion. It is believed that the general topologies concerning the phase equilibria of Ti-M-AI with M being V, Nb, Ta, Mo and W are similar. The relative stabilities of the competing phases, i.e. BCC and HCP, in the mid-composition region of Ti-M-AI were discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 186: Symposium I – Alloy Phase Stability and Design , 1990 , 131
Copyright
Copyright © Materials Research Society 1991

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