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Crystals 2017, 7(10), 295; doi:10.3390/cryst7100295

Formation of Cellular Structure on Metastable Solidification of Undercooled Eutectic CoSi-62 at. %

Department of Mechanical Engineering, Tufts University, Medford, MA 02155, USA
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Author to whom correspondence should be addressed.
Academic Editor: Geun Woo Lee
Received: 13 August 2017 / Revised: 19 September 2017 / Accepted: 27 September 2017 / Published: 30 September 2017
(This article belongs to the Special Issue Crystal Formation from Metastable Liquids)
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Abstract

The relationship between emissivity, delay time, and surface growth for metastable solidification of CoSi-62 at. % eutectic alloys is reported from undercooling experiments conducted using electrostatic levitation. A fraction of the undercooled melt is first solidified to CoSi2 with subsequent nucleation in the mushy-zone of CoSi after an observed delay time. During this double recalescence event, the temperature of the secondary recalescence exceeds the liquidus, indicating that the spectral emissivity has changed. This emissivity change increases with longer delay times during solidification and is linked to the growth of cellular structure on the sample surface. Density measurements showed that the cellular structure begins to grow rapidly at a certain time during metastable solidification. This phenomenon is likely associated with the constitutional undercooling of the remaining melt. View Full-Text
Keywords: CoSi-CoSi2 eutectic; undercooling; metastable solidification; emissivity; electrostatic levitation; cellular structure CoSi-CoSi2 eutectic; undercooling; metastable solidification; emissivity; electrostatic levitation; cellular structure
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Jeon, S.; Matson, D.M. Formation of Cellular Structure on Metastable Solidification of Undercooled Eutectic CoSi-62 at. %. Crystals 2017, 7, 295.

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