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Dendritic growth kinetic of Al68.5Ni31.5 under reduced gravity conditions

Klein, Stefan and Gegner, Jan and Kolbe, Matthias and Herlach, Dieter (2012) Dendritic growth kinetic of Al68.5Ni31.5 under reduced gravity conditions. 10th Materials Day, 8.-9. Nov. 2012, Ruhr-Universität Bochum.

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Abstract

Containerless processing of a metallic specimen offers the potential to directly observe solidification undisturbed by any interaction of the liquid melt with container walls. Since heterogeneous nucleation from containerwalls is completely circumvented it is furthermore realizable to undercool the liquid below its equilibrium melting temperature. On Earth, levitation requires strong electromagnetically fields which however induce strong fluid flow effects (forced convection). This fluid flow affects heat and mass transport and consequently governs the solidification dynamics. Weightlessness on the other hand essentially reduces fluid flow effects so that crystal growth is controlled by intrinsic material-specific transport. In the present experiment Electro-Magnetic Levitation aboard the TEXUS 49 sounding rocket is utilized to measure the dendrite growth velocity of Al68.5Ni31.5.

Document Type:Conference or Workshop Item (Poster)
Title:Dendritic growth kinetic of Al68.5Ni31.5 under reduced gravity conditions
Authors:
AuthorsInstitution or Email of Authors
Klein, Stefanstefan.klein@dlr.de
Gegner, Janjan.gegner@dlr.de
Kolbe, Matthiasmatthias.kolbe@dlr.de
Herlach, Dieterdieter.herlach@dlr.de
Date:November 2012
Keywords:Sounding rocket, µg, levitation, dendritic solidification, undercooled melt,
Event Title:10th Materials Day
Event Location:Ruhr-Universität Bochum
Event Type:Workshop
Event Dates:8.-9. Nov. 2012
Organizer:Materials Research Department (MRD), International Max Planck Reserach School for Surface and Interface Engineering in Advanced Materials (IMPRS-SurMat)
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Research under Space Conditions
DLR - Research area:Raumfahrt
DLR - Program:R FR - Forschung unter Weltraumbedingungen
DLR - Research theme (Project):R - Vorhaben Materialforschung unter Mikro-g
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Physics in Space
Deposited By: Stefan Klein
Deposited On:21 Nov 2012 08:33
Last Modified:21 Nov 2012 08:33

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