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Undercooling and solidification of Ni2B under different convective flow conditions

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

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Kurzfassung

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.

Dokumentart:Konferenzbeitrag (Vortrag)
Titel:Undercooling and solidification of Ni2B under different convective flow conditions
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Binder, Svensven.binder@dlr.de
Gao, JianrongMNorth Eastern University Shenyang, P. R. China
Herlach, Dieterdieter.herlach@dlr.de
Datum:25 März 2010
Erschienen in:DPG Verhandlungen 2010, Condensed Matter Section
Seitenbereich:Seite 525
Status:veröffentlicht
Stichwörter:Dendrite Growth, Undercooled Melts, Convection
Veranstaltungstitel:DPG Spring Meeting, Condensed Matter Section
Veranstaltungsort:Regensburg
Veranstaltungsart:internationale Konferenz
Veranstalter :Deutsche Physikalische Gesellschaft
HGF - Forschungsbereich:Verkehr und Weltraum (alt)
HGF - Programm:Weltraum (alt)
HGF - Programmthema:W FR - Forschung unter Weltraumbedingungen (alt)
DLR - Schwerpunkt:Weltraum
DLR - Forschungsgebiet:W FR - Forschung unter Weltraumbedingungen
DLR - Teilgebiet (Projekt, Vorhaben):W - Vorhaben Materialwissenschaftliche Forschung (alt)
Standort: Köln-Porz
Institute & Einrichtungen:Institut für Materialphysik im Weltraum
Hinterlegt von: Dieter Herlach
Hinterlegt am:12 Apr 2010 09:14
Letzte Änderung:12 Apr 2010 09:14

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