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Intermetallic/Metallic Polyphase In-Situ Composites

Published online by Cambridge University Press:  15 February 2011

D. R. Johnson ,
S. M. Joslin ,
B. F. Oliver ,
R. D. Noebe  and
J. D. Whittenberger
D. R. Johnson
Affiliation:
The University of Tennessee, Knoxville, TN 37996-2200 Materials Science and Engineering Dept.
S. M. Joslin
Affiliation:
The University of Tennessee, Knoxville, TN 37996-2200 Materials Science and Engineering Dept.
B. F. Oliver
Affiliation:
The University of Tennessee, Knoxville, TN 37996-2200 Materials Science and Engineering Dept.
R. D. Noebe
Affiliation:
NASA-Lewis Research Center, Cleveland, OH 44135
J. D. Whittenberger
Affiliation:
NASA-Lewis Research Center, Cleveland, OH 44135
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Abstract

To evaluate various in-situ reinforcement schemes, a computer controlled containerless directional solidification system has been used to produce NiAl-based polyphase composites containing up to two intermetallic phases and at least one ductile phase. Systems evaluated include Ni-Al-Cr, Ni-Al-Mo, Ni-Al-V ternary systems that form NiAl/α-refractory metal eutectics and a three phase eutectic in the Ni-Al-Cr-Nb system. Initial screening of these in-situ composites has included morphological characterization, four point bend testing, temperature dependent yield strength evaluation and compressive creep testing. Occasional growth defects termed “banding” currently interrupt the continuity of these composite structures and limit the attainment of optimum properties. However, both the creep strength and toughness of NiAl were improved by in-situ reinforcement.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 273: Symposium Q – Intermetallic Matrix Composites II , 1992 , 87
Copyright
Copyright © Materials Research Society 1992

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References

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