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Undercooling and solidification of Ni2B under different convective flow conditions

Binder, Sven and Gao, Jianrong and Herlach, Dieter (2010) Undercooling and solidification of Ni2B under different convective flow conditions. In: DPG Verhandlungen 2010, Condensed Matter Section, p. 525. DPG Spring Meeting, Condensed Matter Section, Regensburg.

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Abstract

We investigate the kinetics of crystal growth by measurements of the dendrite growth velocity as a function of undercooling during nonequilibrium solidification. Measurements are conducted under different conditions of convection. The liquid samples are levitated and undercooled in strong alternating electromagnetic fields leading to forced convection. Inductive stirring is avoided by processing the samples in a glassy slag where only natural convection is present. Forced convection and natural convection can be reduced by performing undercooling experiments in reduced gravity. The experimental results obtained under different conditions are compared to each other in order to investigate the influence of convection on the growth dynamics of dendrites in undercooled melts. The congruently melting compound Ni2B is chosenchosen as a suitable sample system. It forms an intermetallic phase with growth velocities that are comparable to the fluid flow velocities in electromagnetically levitated melts. The results are analyzed within dendrite growth models and reveal that the growth velocity is essentially influenced by forced convection in strong electromagnetic fields. The present work is supported by DFG under contract HE1601/25.

Document Type:Conference or Workshop Item (Speech)
Title:Undercooling and solidification of Ni2B under different convective flow conditions
Authors:
AuthorsInstitution or Email of Authors
Binder, Svensven.binder@dlr.de
Gao, JianrongMNorth Eastern University Shenyang, P. R. China
Herlach, Dieterdieter.herlach@dlr.de
Date:25 March 2010
Journal or Publication Title:DPG Verhandlungen 2010, Condensed Matter Section
Page Range:p. 525
Status:Published
Keywords:Dendrite Growth, Undercooled Melts, Convection
Event Title:DPG Spring Meeting, Condensed Matter Section
Event Location:Regensburg
Event Type:international Conference
Organizer:Deutsche Physikalische Gesellschaft
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: Dieter Herlach
Deposited On:12 Apr 2010 09:14
Last Modified:12 Apr 2010 09:14

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