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Dendritic solidification in undercooled Ni-Zr-Al melts: Experiments and modeling

Galenko, Peter and Reutzel, Sven and Herlach, Dieter, M. and Fries, S. G. and Steinbach, I. and Apel, M. (2009) Dendritic solidification in undercooled Ni-Zr-Al melts: Experiments and modeling. Acta Materialia (57), pp. 6166-6175. DOI: 10.1016/j.actamat.2009.08.043.

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Abstract

The kinetics of dendritic solidification in a ternary Ni98Zr1Al1 alloy is investigated experimentally in a range of melt undercoolings 40 K < ∆T < 320 K. The growth velocity is measured for samples processed by the electromagnetic levitation technique using a highspeed video camera. With ∆T = 220 K the measured growth rates are the same as those of a binary Ni99Zr1 alloy. In the regime of rapid solidification, especially within the regime of thermal dendritic growth at DT J220 K, growth rates are decreased. Sharp-interface modeling predicts growth rates over the whole range of undercooling. Phase-field simulations give quantitative predictions for the dendritic growth velocity in the solute-controlled growth regime. Results show that the composition and temperature dependency of the thermodynamic data, e.g. liquidus slope and solute partition coefficient, are important for describing the alloys. Our findings give improved sharp-interface model predictions compared to calculations based on an approximation of the thermodynamic data derived from binary phase diagrams.

Document Type:Article
Title:Dendritic solidification in undercooled Ni-Zr-Al melts: Experiments and modeling
Authors:
AuthorsInstitution or Email of Authors
Galenko, PeterUNSPECIFIED
Reutzel, SvenUNSPECIFIED
Herlach, Dieter, M.UNSPECIFIED
Fries, S. G.ACCESS
Steinbach, I.Jena Optronik GmbH
Apel, M.UNSPECIFIED
Date:2009
Journal or Publication Title:Acta Materialia
Refereed publication:Yes
In Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI:10.1016/j.actamat.2009.08.043
Page Range:pp. 6166-6175
Status:Published
Keywords:Dendritic Solidification, undercooled Ni-Zr-Al melts
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W FR - Forschung unter Weltraumbedingungen (old)
DLR - Research area:Space
DLR - Program:W FR - Forschung unter Weltraumbedingungen
DLR - Research theme (Project):W - Vorhaben Materialwissenschaftliche Forschung (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Physics in Space
Deposited By: Ingeborg Parpart
Deposited On:25 Nov 2009 09:20
Last Modified:26 Mar 2013 13:13

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