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Elevated temperature compressive properties of reaction milled NiAl–AlN and Zr-doped NiAl–AlN composites

Published online by Cambridge University Press:  31 January 2011

J. Daniel Whittenberger  and
Michael J. Luton
J. Daniel Whittenberger
Affiliation:
NASA Lewis Research Center, Cleveland, Ohio 44135
Michael J. Luton
Affiliation:
Exxon Research and Engineering, Annandale, New Jersey 08801
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Abstract

Previous studies of a single lot of NiAl powder which had been ground under high intensity conditions in liquid nitrogen (cryomilling) indicated that this processing leads to a high strength, elevated temperature NiAl–AlN composite. Because this was the first known example of the use of the reaction milling process to produce a high temperature composite, the reproducibility of this technique was unknown. Two additional lots of NiAl powder and a lot of a Zr-doped NiAl powder have been cryomilled, and analyses indicate that AlN was formed within a NiAl matrix in all three cases. Compression testing between 1200 K and 1400 K has shown that the deformation resistance of these heats is similar to that of the first lot of NiAl–AlN; thus cryomilling can improve the creep resistance of NiAl by a factor of six. Based on this work, it is concluded that cryomilling of NiAl powder to form high temperature, high strength NiAl–AlN composites is a reproducible process.

Type
Articles
Information
Journal of Materials Research , Volume 7 , Issue 10 , October 1992 , pp. 2724 - 2732
Copyright
Copyright © Materials Research Society 1992

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References

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