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Mechanical Properties and Microstructure of Certain Niaico(Hf) Alloys

Published online by Cambridge University Press:  28 February 2011

S. M. Russell ,
C. C Law ,
L. S. Lin  and
G. W. Levan
S. M. Russell
Affiliation:
Pratt and Whitney Aircraft, East Hartford, CT 06108
C. C Law
Affiliation:
Pratt and Whitney Aircraft, East Hartford, CT 06108
L. S. Lin
Affiliation:
Pratt and Whitney Aircraft, East Hartford, CT 06108
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Abstract

Cobalt-modified NiAl alloys are being studied for their potential for room temperature ductility and toughness. An alloy of Ni - 29.3 a/o Al - 36.7 a/o Co has shown improved toughness and ductility with respect to binary NiAl alloys due in part to a stress-induced martensitic transformation. Furthermore, the cobalt additions have altered the slip behavior to {110}<111> type from {110} <001> for binary NiAl alloys. Hafnium was added to improve the alloy's relatively poor creep resistance and high temperature strength. Hf was found to be insoluble in the NiAlCo alloy and formed precipitates with a hexagonal structure. The Hfmodified alloy had improved high temperature strength. In addition, the Hf apparently changed the creep mechanism resulting in poorer creep resistance at low temperatures, but improved creep resistance at higher stresses and temperatures.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 186: Symposium I – Alloy Phase Stability and Design , 1990 , 289
Copyright
Copyright © Materials Research Society 1991

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