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Superplasticity in Ll2 Intermetallic Alloys

Published online by Cambridge University Press:  16 February 2011

T. G. Nieh
Affiliation:
Lockheed Missiles and Space Company, Research and Development Divsion, 0/93 10, B/204, 3251 Hanover Street, Palo Alto, CA 94304
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Abstract

Recent advances in superplasticity of L12 intermetallic alloys are reviewed. Results show that superplastic elongations of over 500% can be obtained in this group of materials. These intermetallic alloys include nickel silicide, Ni3 Si, and nickel aluminide, Ni3Al. In this review, the superplastic properties of these alloys are presented. The microstructural characteristics, e.g., grain size, phases, and texture, are described and correlated to the superplastic properties. The effects of alloying additions, temperature, and strain rate on the superplastic properties of these materials are discussed. In addition, the superplastic deformation mechanisms are proposed. Comparison of the superplastic characteristics of the intermetallic alloys are made with metal alloys and ceramic materials.

Type
Research Article
Copyright
Copyright © Materials Research Society 1990

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