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Dendritic solidification and fragmentation in undercooled Ni-Zr alloys

Galenko, P.K. and Phanikumar, G. and Funke, O. and Chernova, L. and Reutzel, S. and Kolbe, M. and Herlach, D.M. (2007) Dendritic solidification and fragmentation in undercooled Ni-Zr alloys. Materials Science and Engineering A, 449-45, pp. 649-653. DOI: 10.1016/j.msea.2006.02.435.

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Abstract

Kinetics of dendritic solidification and fragmentation of dendritic crystals in undercooled Ni–Zr samples are studied. Using the capacitance proximity sensor technique and a high-speed-camera system, the dendrite growth velocity has been measured as a function of initial undercooling in solidifying droplets processed by the electromagnetic levitation technique. Analyses of solidified droplets give evidence to a transition from coarse grained dendrites to grain refined dendrites (CG-GR) at small undercooling, a transition from grain refined dendrites to coarse grained dendrites (GR-CG) at moderate undercooling, and to a second transition from coarse grained dendrites to grain refined dendrites (CG-GR) at a higher undercooling. Predictions of a sharp-interface model are compared with the results of experiments on Ni–Zr samples.

Document Type:Article
Title:Dendritic solidification and fragmentation in undercooled Ni-Zr alloys
Authors:
AuthorsInstitution or Email of Authors
Galenko, P.K.UNSPECIFIED
Phanikumar, G.Indian Institute of Technology Madras
Funke, O.UNSPECIFIED
Chernova, L.UNSPECIFIED
Reutzel, S.Ruhr-Universität Bochum
Kolbe, M.UNSPECIFIED
Herlach, D.M.UNSPECIFIED
Date:2007
Journal or Publication Title:Materials Science and Engineering A
Volume:449-45
DOI:10.1016/j.msea.2006.02.435
Page Range:pp. 649-653
Status:Published
Keywords:Unterkühlung von Materialien
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 > Institute of Space Simulation > Center for Solidification of Undercooled Melts (ZEUS)
Deposited By: Ingeborg Parpart
Deposited On:05 Jun 2007
Last Modified:12 Dec 2013 20:23

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