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An experimental study on the interaction of fluid flow and solidification in Al-Si-Cu alloys

Steinbach, Sonja and Ratke, Lorenz (2007) An experimental study on the interaction of fluid flow and solidification in Al-Si-Cu alloys. In: Solidification Processing: Proceedings of the 5th Decennial International Conference on Solidification Processing, pp. 411-415. Department of Engineering Materials, University of Sheffield, Great Britain. 5th Decennial International Conference on Solidification Processing, 2007-07-23 - 2007-07-25, Sheffield, UK. ISBN 0-9522507-4-8. ISSN 978-0-9522507-4-6

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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:Conference or Workshop Item (Speech, Paper)
Title:An experimental study on the interaction of fluid flow and solidification in Al-Si-Cu alloys
Authors:
AuthorsInstitution or Email of Authors
Steinbach, SonjaUNSPECIFIED
Ratke, LorenzUNSPECIFIED
Date:July 2007
Journal or Publication Title:Solidification Processing: Proceedings of the 5th Decennial International Conference on Solidification Processing
Refereed publication:Yes
In ISI Web of Science:No
Page Range:pp. 411-415
Editors:
EditorsEmail
Jones, HowardUNSPECIFIED
Publisher:Department of Engineering Materials, University of Sheffield, Great Britain
Series Name:Proceedings of the 5th Decennial Internatioanl Conference on Solidification Processing
ISSN:978-0-9522507-4-6
ISBN:0-9522507-4-8
Status:Published
Keywords:solidification, electromagnetic stirring, fluid flow, Al-Si-Cu alloys, dendritic microstructure
Event Title:5th Decennial International Conference on Solidification Processing
Event Location:Sheffield, UK
Event Type:international Conference
Event Dates:2007-07-23 - 2007-07-25
Organizer:Howard Jones
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. Sonja Steinbach
Deposited On:31 Jul 2007
Last Modified:27 Apr 2009 14:09

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