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Containerless processing and rapid solidification of Nb-Si alloys in the niobium-rich eutectic rangeContainerless processing and rapid solidification techniques were used to process Nb-Si alloys in the Nb-rich eutectic range. Electromagnetically levitated drops were melted and subsequently splat-quenched from different temperatures. A variety of eutectic morphologies was obtained as a function of the degree of superheating or undercooling of the drops prior to splatting. Metallic glass was observed only in drops quenched from above the melting temperature. Microstructures of splats deeply undercooled prior to quenching were very fine and uniform. These results are discussed in terms of classic nucleation theory concepts and the expected heat evolution at different regions of the splat during the rapid quenching process. The locations of the coupled-zone boundaries for the alpha-Nb + Nb3Si eutectic are also suggested.
Document ID
19920029996
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Hofmeister, W. H.
(Vanderbilt Univ. Nashville, TN, United States)
Bayuzick, R. J.
(Vanderbilt University Nashville, TN, United States)
Robinson, M. B.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Bertero, G. A.
(Vanderbilt Univ. Nashville, TN, United States)
Date Acquired
August 15, 2013
Publication Date
November 1, 1991
Publication Information
Publication: Metallurgical Transactions A - Physical Metallurgy and Materials Science
Volume: 22A
ISSN: 0360-2133
Subject Category
Metallic Materials
Accession Number
92A12620
Funding Number(s)
CONTRACT_GRANT: NAG8-765
CONTRACT_GRANT: DE-AC05-76OR-00033
Distribution Limits
Public
Copyright
Other

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