Modeling of convection, temperature distribution and dendritic growth in glass-fluxed nickel melts / Gao J., Kao A., Bojarevics V., Pericleous K., Galenko P.K., Alexandrov D.V. // Journal of Crystal Growth. - 2017. - V. 471, l. . - P. 66-72.

ISSN:

00220248

Type:

Article

Abstract:

Melt flow is often quoted as the reason for a discrepancy between experiment and theory on dendritic growth kinetics at low undercoolings. But this flow effect is not justified for glass-fluxed melts where the flow field is weaker. In the present work, we modeled the thermal history, flow pattern and dendritic structure of a glass-fluxed nickel sample by magnetohydrodynamics calculations. First, the temperature distribution and flow structure in the molten and undercooled melt were simulated by reproducing the observed thermal history of the sample prior to solidification. Then the dendritic structure and surface temperature of the recalescing sample were simulated. These simulations revealed a large thermal gradient crossing the sample, which led to an underestimation of the real undercooling for dendritic growth in the bulk volume of the sample. By accounting for this underestimation, we recalculated the dendritic tip velocities in the glass-fluxed nickel melt using a theory of three-dimensional dendritic growth with convection and concluded an improved agreement between experiment and theory. © 2016 Elsevier B.V.

Author keywords:

A1. Convection; A1. Dendrites; A1. Impurities; A1. Solidification; A2. Growth from melts; B1. Metals

Index keywords:

Atmospheric temperature; Flow patterns; Glass; Magnetohydrodynamics; Nickel; Solidification; Temperature distribution; Undercooling; Dendritic growth; Dendritic structures; Growth from melts; Surface

DOI:

10.1016/j.jcrysgro.2016.11.069

Смотреть в Scopus:

https://www.scopus.com/inward/record.uri?eid=2-s2.0-85007233478&doi=10.1016%2fj.jcrysgro.2016.11.069&partnerID=40&md5=a465ae554807d1b0eaf08379dc863781

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Link	https://www.scopus.com/inward/record.uri?eid=2-s2.0-85007233478&doi=10.1016%2fj.jcrysgro.2016.11.069&partnerID=40&md5=a465ae554807d1b0eaf08379dc863781
Affiliations	Key Laboratory of Electromagnetic Processing of Materials (Ministry of Education), Northeastern University, Shenyang, China; Center of Numerical Modeling and Process Analysis, University of Greenwich, London, United Kingdom; Department of Physics and Astronomy, Friedrich Schiller University of Jena, Jena, Germany; Department of Mathematical Physics, Ural Federal University, Ekaterinburng, Russian Federation
Author Keywords	A1. Convection; A1. Dendrites; A1. Impurities; A1. Solidification; A2. Growth from melts; B1. Metals
Funding Details	14–29-10282, RSF, Russian Science Foundation; 16-11-10095, RSF, Russian Science Foundation; 51071043, NSFC, National Natural Science Foundation of China; 51211130113, NSFC, National Natural Science Foundation of China; RE 1261/8-2, DFG, Deutsche Forschungsgemeinschaft
Funding Text	The authors thank S. Cai and Z. Zhai for editing computer codes for calculations of dendritic tip velocities. J. Gao acknowledges support by the National Natural Science Foundation of China (51071043 and 51211130113), Fundamental Research Funds for Central Universities (N130509001), and the Overseas Expert Program of the International Office of Northeastern University (X2015001). A. Kao and K. Pericleous acknowledge support by the International Exchanges Scheme of the Royal Society of the United Kingdom. D. V. Alexandrov acknowledges support from the Russian Science Foundation (Project No. 16-11-10095). P. K. Galenko acknowledges support by German Research Foundation (DFG Project RE 1261/8-2) and Russian Foundation for Basic Research (RFBR Project No. 14–29-10282).
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Correspondence Address	Gao, J.; Key Laboratory of Electromagnetic Processing of Materials (Ministry of Education), Northeastern UniversityChina; email: jgao@mail.neu.edu.cn
Publisher	Elsevier B.V.
CODEN	JCRGA
Language of Original Document	English
Abbreviated Source Title	J Cryst Growth
Source	Scopus