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Fatigue and Fracture of Nickel Aluminide Composites

Published online by Cambridge University Press:  15 February 2011

Padu Ramasundaram ,
Randy Bowman  and
Wole Soboyejo
Padu Ramasundaram
Affiliation:
The Ohio State University, Dept. of Materials Science and Engineering, Columbus, OH 43210
Randy Bowman
Affiliation:
NASA Lewis Research Center, Cleveland, OH 44135
Wole Soboyejo
Affiliation:
The Ohio State University, Dept. of Materials Science and Engineering, Columbus, OH 43210
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Abstract

The results of preliminary investigations of the room-temperature fatigue and fracture mechanisms in model NiAl composites are presented. The composite systems studied include: NiAl reinforced with ductile second phase particles (Mo); ductile fibers (Mo); brittle second phase particles (zirconia partially stabilized with yttria) and brittle fibers+particles (Al2O3 + zirconia). Mechanisms of fatigue crack growth in heat treated specimens of the fiber-reinforced composites are also elucidated. The investigations indicate that both ductile and brittle reinforcements can enhance the toughness of NiAl significantly, and the ductile phase particulate reinforcement may even contribute to room-temperature ductility in the composite.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 350: Symposium U – Intermetallic Matrix Composites III , 1994 , 225
Copyright
Copyright © Materials Research Society 1994

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