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Change of the Kinetics of Solidification and Microstructure Formation induced by Convection in the Ni-Al System

Reutzel, S. and Hartmann, H. and Galenko, P. K. and Schneider, S. and Herlach, D. M. (2007) Change of the Kinetics of Solidification and Microstructure Formation induced by Convection in the Ni-Al System. Applied Physics Letters, 91 (4), 041913-1-041913-3. American Institute of Physics. DOI: 10.1063/1.2760154.

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Abstract

The purpose of the present work was to measure the velocity of dendrite growth in undercooled Ni–Al alloy melts as a function of undercooling. The experiments were performed both by containerless electromagnetic levitation on Earth and under reduced gravity conditions during parabolic flight campaigns. While under terrestrial conditions, strong magnetic fields are required to compensate the gravitational force, the forces to compensate disturbing accelerations are decreased by orders of magnitude in reduced gravity. In turn, the alternating electromagnetic fields induce convection, which is strong under terrestrial conditions while much weaker in reduced gravity. The heat and mass transport in front of the solid-liquid interface during solidification controls the dynamics of dendrite growth. By comparing results obtained on Earth and in reduced gravity, it was demonstrated that the change of transport conditions by convection significantly alters the kinetics of solidification and the evolution of grain refined microstructures at undercoolings less than 100 K.

Document Type:Article
Title:Change of the Kinetics of Solidification and Microstructure Formation induced by Convection in the Ni-Al System
Authors:
AuthorsInstitution or Email of Authors
Reutzel, S.Ruhr-Universität Bochum
Hartmann, H.Ruhr-Universität Bochum
Galenko, P. K.UNSPECIFIED
Schneider, S.UNSPECIFIED
Herlach, D. M.UNSPECIFIED
Date:2007
Journal or Publication Title:Applied Physics Letters
Volume:91
DOI:10.1063/1.2760154
Page Range:041913-1-041913-3
Publisher:American Institute of Physics
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 Materialforschung unter Mikro-g (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: Dr.rer.nat. Sven Reutzel
Deposited On:30 Jul 2007
Last Modified:12 Dec 2013 20:24

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