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Phase Stability in Processing of High Temperature Intermetallic Alloys

Published online by Cambridge University Press:  15 February 2011

J. H. Perepezko ,
C. A. Nuñes ,
S.-H. Yi  and
D. J. Thoma
J. H. Perepezko
Affiliation:
Dept. Mat. Sci. and Engr., University of Wisconsin-Madison, 1509 Univ. Ave., Madison, WI53706
C. A. Nuñes
Affiliation:
Dept. Mat. Sci. and Engr., University of Wisconsin-Madison, 1509 Univ. Ave., Madison, WI53706
S.-H. Yi
Affiliation:
Dept. Mat. Sci. and Engr., University of Wisconsin-Madison, 1509 Univ. Ave., Madison, WI53706
D. J. Thoma
Affiliation:
Los Alamos National Laboratory, CMS, K765, Los Alamos, NM 87545
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Abstract

In the development of high temperature intermetallics involving various aluminides, suicides and Laves phases, it has become evident that it is essential to consider the strong influence of materials processing throughout all stages. The underlying basis for alloy synthesis, processing and the assessment of thermal stability is established by the relevant phase equilibria, the characteristic diffusivities and the possible solidification reaction pathways. In almost all cases the microstructures of the most useful metallic alloys are multiphase assemblies in which the relative phase fractions, compositions and morphologies play key roles in optimizing the performance under high temperature conditions. The microstructure designs are usually tailored for strength, toughness, creep resistance and environmental stability and involve a balance of features derived from mixtures of a ductile phase and intermetallic phases. There is a clear experience that the level of materials processing can only be as sophisticated as the level of knowledge of the phase equilibria and the underlying kinetics. In many of the contemporary intermetallic alloys the phase stability must be considered in terms of multicomponent equilibria and non-stoichiometric intermetallic compositions. Recent developments in several important intermetallic alloy classes illustrate the guidance into alloy design and processing options provided by systematic studies of phase stability.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 460: Symposium Z – High-Temperature Ordered Intermetallic Alloys VII , 1996 , 3
Copyright
Copyright © Materials Research Society 1997

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