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Experimental study on interaction of fluid flow and solidification in Al-Si-Cu alloys

Steinbach, Sonja and Ratke, Lorenz (2007) Experimental study on interaction of fluid flow and solidification in Al-Si-Cu alloys. International Journal of Cast Metals Research, 20 (3), pp. 140-144. Maney Publishing. ISSN 1364-0461.

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Abstract

A hypoeutectic Al-6wt.%Si-4wt.%Cu alloy was used in the present study to investigate the effect of controlled fluid flow conditions on the microstructure formation in cast Al-alloys experimentally. The alloy has been directionally solidified upwards under a medium temperature gradient (3K/mm) in an aerogel-based furnace facility over a range of constant solidification velocities (0.015-0.15mm/s). A coil system around the sample induces a homogeneous rotating magnetic field being able to generate a controlled fluid flow in the melt. The application of rotating magnetic fields during directional solidification results in a strong segregation effect: For high magnetic induction and therefore high fluid flow velocity an enrichment of solute is observed at the axis of the sample. The primary dendrite spacing decreases whereas the secondary dendrite arm spacing increases with increasing magnetic induction, clearly revealing the effects of convections on solidification kinetics.

Document Type:Article
Title:Experimental study on interaction of fluid flow and solidification in Al-Si-Cu alloys
Authors:
AuthorsInstitution or Email of Authors
Steinbach, SonjaUNSPECIFIED
Ratke, LorenzUNSPECIFIED
Date:2007
Journal or Publication Title:International Journal of Cast Metals Research
Refereed publication:Yes
In ISI Web of Science:Yes
Volume:20
Page Range:pp. 140-144
Editors:
EditorsEmail
Wells, JosephUNSPECIFIED
Publisher:Maney Publishing
ISSN:1364-0461
Status:Published
Keywords:Al-Si-Cu, solidification, fluid flow, electromagnetic stirring, dendrite spacing
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
Deposited By: Dr.rer.nat. Sonja Steinbach
Deposited On:29 Nov 2007
Last Modified:27 Apr 2009 14:23

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