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The Influence of Fluid Flow on the Microstructure of Directionally Solidified AlSi-Base Alloys

Steinbach, Sonja and Ratke, Lorenz (2007) The Influence of Fluid Flow on the Microstructure of Directionally Solidified AlSi-Base Alloys. In: Metallurgical and Materials Transactions A, 38A, pp. 1388-1394. MINERALS METALS MATERIALS SOC, 184 THORN HILL RD, WARRENDALE, USA, PA, 15086. TMS 2006, Symposium: Solidification Modeling and Microstructure Formation: In Honor of Prof. John Hunt, 2006-03-13 - 2006-03-15, San Antonio, TX (USA). ISSN 1073-5623

Full text not available from this repository.

Official URL: http://www.springerlink.com/content/49638l3p31277270

Abstract

To obtain a quantitative understanding of the effect of fluid flow on the microstructure of cast alloys, a technical Al-7 wt pct Si-0.6 wt pct Mg alloy (A357) has been directionally solidified with a medium temperature gradient under well-defined thermal and fluid-flow conditions. The solidification was studied in an aerogel-based furnace, which established flat isotherms and allowed the direct optical observation of the solidification process. A coil system around the sample induces a homogeneous rotating magnetic field (RMF) and, hence, a well-defined flow field close to the growing solid-liquid interface. The application of RMFs during directional solidification results in pronounced segregation effects: a change to pure eutectic solidification at the axis of the sample at high magnetic field strengths is observed. The investigations show that with increasing magnetic induction and, therefore, fluid flow, the primary dendrite spacing decreases, whereas the secondary dendrite arm spacing increases. An apparent flow effect on the eutectic spacing is observed.

Document Type:Conference or Workshop Item (Speech, Paper)
Title:The Influence of Fluid Flow on the Microstructure of Directionally Solidified AlSi-Base Alloys
Authors:
AuthorsInstitution or Email of Authors
Steinbach, SonjaUNSPECIFIED
Ratke, LorenzUNSPECIFIED
Date:19 June 2007
Journal or Publication Title:Metallurgical and Materials Transactions A
Refereed publication:Yes
In ISI Web of Science:Yes
Volume:38A
Page Range:pp. 1388-1394
Publisher:MINERALS METALS MATERIALS SOC, 184 THORN HILL RD, WARRENDALE, USA, PA, 15086
Series Name:DOI - 10.1007/s11661-007-9162-1
ISSN:1073-5623
Status:Published
Keywords:directional solidification, aluminum alloys, fluid flow, rotating magnetic field, dendrite spacing
Event Title:TMS 2006, Symposium: Solidification Modeling and Microstructure Formation: In Honor of Prof. John Hunt
Event Location:San Antonio, TX (USA)
Event Type:international Conference
Event Dates:2006-03-13 - 2006-03-15
Organizer:TMS
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 14:04

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