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Coarsening of the mushy zone in an AlCu30 alloy accelerated by a rotating magnetic field

Kasperovich, Galina and Genau, Amber and Ratke, Lorenz (2009) Coarsening of the mushy zone in an AlCu30 alloy accelerated by a rotating magnetic field. Forschungszentrum Rossendorf. Electromagnetic Processing of Materials, 19.-23.Okt. 2009, Dresden. ISBN 978-3-936104-65-3.

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Abstract

Annealing experiments were performed on a near-eutectic Al-30wt%30 alloy held in temperature gradients from 0.1 to 3 K/mm for annealing times of 10 to 500 minutes, with and without the application of rotating magnetic fields. After annealing, metallographic analysis was carried out on sections of the samples having a constant fraction solid of 10%. X-ray tomography was also used to create three-dimensional reconstructions of the microstructures with a spatial resolution of approximately 1µm. The specific surface area was measured in 2D and 3D, as well as the local curvature distribution on the 3D reconstructed images. The microstructures clearly show that fluid flow accelerates coarsening of the mush, and that the temperature gradient has a pronounced and unexpected influence on the coarsening kinetics, which is explained qualitatively with a simple model of secondary dendrite arm growth.

Document Type:Conference or Workshop Item (Speech, Paper)
Title:Coarsening of the mushy zone in an AlCu30 alloy accelerated by a rotating magnetic field
Authors:
AuthorsInstitution or Email of Authors
Kasperovich, GalinaUNSPECIFIED
Genau, AmberUNSPECIFIED
Ratke, LorenzUNSPECIFIED
Date:October 2009
Page Range:pp. 296-299
Editors:
EditorsEmail
Gerbeth, GünterFZ Rossendorf
Fautrelle, YvesSIMAP/EPM Grenoble
Publisher:Forschungszentrum Rossendorf
ISBN:978-3-936104-65-3
Status:Published
Keywords:mushy zone, coarsening, tomography, gradient aneal
Event Title:Electromagnetic Processing of Materials
Event Location:Dresden
Event Type:international Conference
Event Dates:19.-23.Okt. 2009
Organizer:Forschunszentrum Rossendorf und SIMAP Grenoble
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: Prof. Lorenz Ratke
Deposited On:04 Nov 2009 15:56
Last Modified:04 Nov 2009 15:56

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