Containerless processing and rapid solidification of Nb-Si alloys in the niobium-rich eutectic range |
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Authors: | G A Bertero W H Hofmeister M B Robinson R J Bayuzick |
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Affiliation: | (1) Department of Materials Science and Engineering, Stanford University, 94305 Stanford, CA;(2) Materials Science and Engineering Department, Vanderbilt University, 37235 Nashville, TN;(3) Space Sciences, NASA George C. Marshall Space Flight Center, 35812 Huntsville, AL |
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Abstract: | Containerless processing and rapid solidification techniques were used to process Nb-Si alloys in the Nb-rich eutectic range.
Electromagnetic ally 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. Micro-structures 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 α-Nb + Nb3Si eutectic are also suggested.
Formerly Graduate Student, Vanderbilt University. |
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