Please use this identifier to cite or link to this item: http://hdl.handle.net/10995/102172
Title: Modeling of convection, temperature distribution and dendritic growth in glass-fluxed nickel melts
Authors: Gao, J.
Kao, A.
Bojarevics, V.
Pericleous, K.
Galenko, P. K.
Alexandrov, D. V.
Issue Date: 2017
Publisher: Elsevier B.V.
Citation: Modeling of convection, temperature distribution and dendritic growth in glass-fluxed nickel melts / J. Gao, A. Kao, V. Bojarevics, et al. — DOI 10.1016/j.jcrysgro.2016.11.069 // Journal of Crystal Growth. — 2017. — Vol. 471. — P. 66-72.
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.
Keywords: A1. CONVECTION
A1. DENDRITES
A1. IMPURITIES
A1. SOLIDIFICATION
A2. GROWTH FROM MELTS
B1. METALS
FLOW PATTERNS
GLASS
MAGNETOHYDRODYNAMICS
NICKEL
SOLIDIFICATION
TEMPERATURE DISTRIBUTION
UNDERCOOLING
DENDRITIC GROWTH
DENDRITIC STRUCTURES
GROWTH FROM MELTS
SURFACE TEMPERATURES
THERMAL HISTORY
TIP VELOCITY
UNDERCOOLED MELT
UNDERCOOLINGS
GROWTH KINETICS
URI: http://hdl.handle.net/10995/102172
Access: info:eu-repo/semantics/openAccess
SCOPUS ID: 85007233478
PURE ID: 1816018
4c3ded09-4e10-4942-ae5c-6a3baec5f3a4
ISSN: 220248
DOI: 10.1016/j.jcrysgro.2016.11.069
Appears in Collections:Научные публикации, проиндексированные в SCOPUS и WoS CC

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