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Elevated temperature compressive properties of reaction milled NiAl-AlN and Zr-doped NiAl-AlN compositesPrevious 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.
Document ID
19930027425
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Whittenberger, J. D.
(NASA Lewis Research Center Cleveland, OH, United States)
Luton, Michael J.
(Exxon Research and Engineering Co. Annandale, NJ, United States)
Date Acquired
August 15, 2013
Publication Date
October 1, 1992
Publication Information
Publication: Journal of Materials Research
Volume: 7
Issue: 10
ISSN: 0884-2914
Subject Category
Composite Materials
Accession Number
93A11422
Distribution Limits
Public
Copyright
Other

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