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Fracture Toughness of NiAl In-Situ Eutectic Composites.

Published online by Cambridge University Press:  15 February 2011

F. E. Heredia  and
J. J. Valencia
F. E. Heredia
Affiliation:
Materials Department, University of California, Santa Barbara, CA 93106.
J. J. Valencia
Affiliation:
Metalworking Technology, Inc., Johnstown, PA 15904.
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Abstract

Mechanical tests were performed on directionally solidified (DS) NiAl in-situ eutectic composites in order to evaluate the effect of ductile reinforcements on the fracture resistance of the B2 ordered intermetallic compound NiAl. Reinforcements consisted of i) Mo fibers, ii) Cr fibers, and iii) Cr(Mo) solid solution plates. Near stoichiometric NiAl ingots were prepared by induction melting as reference material to compare with the eutectic composites. Resistance curves were obtained for the NiAl/Mo fibrous eutectic alloy as well as for the NiAl/Cr(Mo) layered material. The initiation fracture toughness of the DS NiAl/Mo and NiAl/Cr(Mo) eutectic composites is larger than that of the stoichiometric NiAl, with the layered material. producing the better properties. The mechanisms for such increase in fracture toughness are discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 273: Symposium Q – Intermetallic Matrix Composites II , 1992 , 197
Copyright
Copyright © Materials Research Society 1992

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References

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