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Microstructures and Mechanical Behavior of Nb-Ti Base Beta + Silicide Alloys

Published online by Cambridge University Press:  25 February 2011

P. R. Subramanian ,
M. G. Mendiratta  and
D. M. Dimiduk
P. R. Subramanian
Affiliation:
Materials Research Division, UES, Inc., 4401 Dayton-Xenia Road, Dayton, OH 45432.
M. G. Mendiratta
Affiliation:
Materials Research Division, UES, Inc., 4401 Dayton-Xenia Road, Dayton, OH 45432.
D. M. Dimiduk
Affiliation:
Wright Laboratory, WL/MLLM, Wright-Patterson AFB, OH 45433.
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Abstract

Studies on Nb/Nb5Si3 based in-situ composites have demonstrated an acceptable balance of low-temperature damage tolerance and high-temperature strength/creep resistance. However, catastrophic oxidation and embrittlement of these materials limit their usefulness in structural applications. Alloying studies were initiated at Wright Laboratory with the aim of obtaining incremental improvement in the overall oxidation response of the Nb/Nb5Si3 system, while seeking microstructurally similar systems. The results showed that reduced metal recession rates and oxygen embrittlement can be obtained by Ti and Al additions to Nb-Si base alloys. This paper focuses on the effect of Ti and Al alloying additions to Nb-Si base alloys on phase equilibria, microstructures, temperature dependence of strength, low-temperature toughness, and environmental resistance.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 322: Symposium F – High-Temperature Silicides and Refractory Alloys , 1993 , 491
Copyright
Copyright © Materials Research Society 1994

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