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Study of Transformation-Induced Ductility in Polycrystalline Nickel Aluminide

Published online by Cambridge University Press:  25 February 2011

Ananda S. Murthy  and
Edward Goo
Ananda S. Murthy
Affiliation:
Department of Materials Science and Engineering, University of Southern California, Los Angeles CA 90089-0241.
Edward Goo
Affiliation:
Department of Materials Science and Engineering, University of Southern California, Los Angeles CA 90089-0241.
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Abstract

Nickel aluminide intermetallic compounds are of interest due to their good high temperature properties. However, they are associated with room temperature brittleness. A method for enhancing the room temperature ductility of polycrystalline NiAI in the composition range of 62-65 at.% by using the martensitic transformation is presented. Transformationinduced ductilities up to 4.5% in specimens with coarse grains have been obtained in our investigation. The effects of Ni concentration, grain size and quenching rate from the parent B2 phase are studied and optimized to induce maximum transformation ductility. The original excellent high temperatu re properties are restored from the ‘soft’ room temperatu re martensitic phase by heating to an appropriate temperature to revert to the equilibrium phases.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 246: Symposium M – Shape-Memory Materials and Phenomena--Fundamental Aspects and Applications , 1991 , 129
Copyright
Copyright © Materials Research Society 1992

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