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Phase selection and microstructure formation in undercooled Co-61.8at.%Si melts under various containerless processing conditions

Zhang, Y.K. and Gao, J. and Kolbe, M. and Klein, S. and Yang, C. and Yasuda, H. and Herlach, D. M. and Gandin, C.-A. (2013) Phase selection and microstructure formation in undercooled Co-61.8at.%Si melts under various containerless processing conditions. Acta Materialia, 61, pp. 4861-4873. Elsevier. doi: 10.1016/j.actamat.2013.04.061. ISSN 1359-6454.

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Abstract

Hypoeutectic Co-61.8at.%Si composition was undercooled and solidified using electromagnetic levitation, electromagnetic levitation under a static magnetic field, electrostatic levitation and glass-fluxing. The samples generally show two thermal events, either separated or continuous depending on undercooling. In-situ monitoring of the two thermal events with a high-speed camera revealed a sudden decrease of dendritic growth velocities of primary phases at a critical undercooling of 88 K. Scanning electron microscopic studies of the solidified samples showed that the CoSi compound and the CoSi2 compound nucleate as the primary phase for low and high undercoolings, respectively. The microstructure of the samples depends not only on undercooling, but also on the onset temperature or delay time of the second thermal event. Melt convection has no influence on primary phase selection in undercooled melts, but it has a significant influence on the delay time and therefore on microstructure formation of the samples for high undercoolings.

Item URL in elib:https://elib.dlr.de/83233/
Document Type:Article
Title:Phase selection and microstructure formation in undercooled Co-61.8at.%Si melts under various containerless processing conditions
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Zhang, Y.K.Northeastern University, Shenyang, ChinaUNSPECIFIED
Gao, J.Northeastern University, Shenyang, ChinaUNSPECIFIED
Kolbe, M.Institut für Materialphysik im Weltraum, DLR, KölnUNSPECIFIED
Klein, S.Institut für Materialphysik im Weltraum, DLR, KölnUNSPECIFIED
Yang, C.Northeastern University, Shenyang, ChinaUNSPECIFIED
Yasuda, H.Osaka University, JapanUNSPECIFIED
Herlach, D. M.Institut für Materialphysik im Weltraum, DLR, KölnUNSPECIFIED
Gandin, C.-A.Ecole Nationale Superieure des Mines de Paris (Frankreich)UNSPECIFIED
Date:2013
Journal or Publication Title:Acta Materialia
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:61
DOI :10.1016/j.actamat.2013.04.061
Page Range:pp. 4861-4873
Publisher:Elsevier
ISSN:1359-6454
Status:Published
Keywords:CoSi-CoSi2 eutectic, undercooling, nucleation, microstructure, convection
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Research under Space Conditions
DLR - Research area:Raumfahrt
DLR - Program:R FR - Research under Space Conditions
DLR - Research theme (Project):R - Vorhaben Materialforschung unter Mikro-g (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Physics in Space > Scientific Experiments MP
Deposited By: Kolbe, Matthias
Deposited On:05 Jul 2013 08:26
Last Modified:10 Jan 2019 15:45

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