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Assessment of Microalloying Effects on the High Temperature Fatigue Behavior of NiAl

Published online by Cambridge University Press:  22 February 2011

R. D. Noebe ,
B. A. Lerch ,
K. Bhanu  and
Sankara Rao
R. D. Noebe
Affiliation:
NASA Lewis Research Center, Cleveland, OH 44135
B. A. Lerch
Affiliation:
NASA Lewis Research Center, Cleveland, OH 44135
K. Bhanu
Affiliation:
NASA Lewis Research Center, Cleveland, OH 44135
Sankara Rao
Affiliation:
NRC Associate, NASA-LeRC
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Abstract

Binary NiAl suffers from a lack of strength and poor creep properties at and above 1000 K. Poor creep resistance in turn affects low cycle fatigue (LCF) lives at low strain ranges due to the additional interactions of creep damage. One approach for improving these properties involves microalloying with either Zr or N. As an integral part of a much larger alloying program the low cycle fatigue behavior of Zr and N doped nickel aluminides produced by extrusion of prealloyed powders has been investigated. Strain controlled LCF tests were performed in air at 1000 K. The influence of these microalloying additions on the fatigue life and cyclic stress response of polycrystalline NiAl are discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 364: Symposium L – High-Temperature Ordered Intermetallic Alloys–VI , 1994 , 291
Copyright
Copyright © Materials Research Society 1995

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