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The effect of rotating magnetic fields on the microstructure of directionally solidified Al–Si–Mg alloys

Steinbach, Sonja and Ratke, Lorenz (2005) The effect of rotating magnetic fields on the microstructure of directionally solidified Al–Si–Mg alloys. Materials Science and Engineering, 413-414, pp. 200-204.

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Official URL: http://www.sciencedirect.com/science?_ob=IssueURL&_tockey=%23TOC%235588%232005%23995869999%23612101%23FLA%23&_auth=y&view=c&_acct=C000007338&_version=1&_urlVersion=0&_userid=100058&md5=0117b34f0abe5f80e97065d1cd7ef3d6

Abstract

The effect of magnetically controlled convective conditions on the microstructure formation in cast Al-alloys is investigated. Samples of the technical Al–7 wt.% Si–0.6 wt.% Mg alloy (A357) have been directionally solidified under medium temperature gradient (3 K/mm) in the aerogel based furnace facility ARTEMIS. Three pairs of Helmholtz coils around the sample induce a homogeneous rotating magnetic field being able to generate a controlled fluid flow in the melt close to the growing solid–liquid interface. The application of rotating magnetic fields during directional solidification results in pronounced segregation effects, leading to a deformation of the solidification front. For high magnetic field strengths, a change to pure eutectic solidification at the axis of the sample is observed. The investigations show that with increasing fluid flow the primary dendrite spacing decreases whereas the secondary dendrite arm spacing increases.

Document Type:Article
Title:The effect of rotating magnetic fields on the microstructure of directionally solidified Al–Si–Mg alloys
Authors:
AuthorsInstitution or Email of Authors
Steinbach, SonjaUNSPECIFIED
Ratke, LorenzUNSPECIFIED
Date:2005
Journal or Publication Title:Materials Science and Engineering
Refereed publication:Yes
In ISI Web of Science:Yes
Volume:413-414
Page Range:pp. 200-204
Status:Published
Keywords:Solidification, Al–Si alloys, Convection, Rotating magnetic field
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: Prof. Lorenz Ratke
Deposited On:15 Feb 2006
Last Modified:27 Apr 2009 04:46

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