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Influence of TMF-induced fluid flow on the microstructure of Al-Si7-Mn1 wt.% alloy

Orth, Andreas and Ratke, Lorenz (2011) Influence of TMF-induced fluid flow on the microstructure of Al-Si7-Mn1 wt.% alloy. In: IOP Conf. Series: Materials Science and Engineering, 27 (012044). IOP Publishing Ltd. ICASP 3, 7.-10.2011, Rolduc, Netherlands. ISSN 1757-899X

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Official URL: http://iopscience.iop.org/1757-899X/27/1/012044

Abstract

The precipitation of Mn-rich intermetallics in AlSiMn alloys during solidification ahead of the mushy zone affects the solidification microstructure, especially if fluid flow is present. Recently Steinbach and Ratke reported a barrier effect of �-AlMnSi, meaning these intermetallics prevent fluid flow to enter the mush. To investigate this effect further we studied the solidification of AlSi7Mn1 with a fluid flow field induced by a traveling magnetic field (TMF). Samples were molten and directionally solidified within a silica aerogel crucible at various constant solidification velocities between 0.03 and 0.24 mm/s. The application of two separate heaters allowed the fixation of constant temperature gradients in the solid and liquid parts of the samples, the use of a transparent aerogel as crucible material permitted direct optical verification of the desired solidification velocity using an infrared line camera. Three collinear coils induced a TMF of approximately 5 mT strength, traveling either up or downward in the direction of the sample axis. The microstructures of the processed samples were studied using light microscopy and SEM-EDX and characterised by the primary and secondary dendrite arm spacing, the distribution of intermetallic phases as well as the radial segregation of primary phase and eutectic. Results are presented which show differences between samples with and without TMF-induced fluid flow. We noticed a radial macro-segregation dependent on the orientation of the TMF and the effects of the induced fluid flow on the primary and secondary dendrite arm spacing are examined.

Document Type:Conference or Workshop Item (Paper, Poster)
Title:Influence of TMF-induced fluid flow on the microstructure of Al-Si7-Mn1 wt.% alloy
Authors:
AuthorsInstitution or Email of Authors
Orth, AndreasUNSPECIFIED
Ratke, LorenzUNSPECIFIED
Date:December 2011
Journal or Publication Title:IOP Conf. Series: Materials Science and Engineering
Refereed publication:Yes
In ISI Web of Science:Yes
Volume:27
Editors:
EditorsEmail
Ratke, LorenzUNSPECIFIED
Zimmermann, GerhardAccess eV, Aachen
Publisher:IOP Publishing Ltd
ISSN:1757-899X
Status:Published
Keywords:intermetallic phases, Al-Si cast alloys, fluid flow, travelling magnetic fields, microstructure, directional solidification
Event Title:ICASP 3
Event Location:Rolduc, Netherlands
Event Type:international Conference
Event Dates:7.-10.2011
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Research under Space Conditions
DLR - Research area:Raumfahrt
DLR - Program:R FR - Forschung unter Weltraumbedingungen
DLR - Research theme (Project):R - Vorhaben Materialwissenschaftliche Forschung
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Physics in Space
Deposited By: Prof. Lorenz Ratke
Deposited On:31 Jan 2012 15:01
Last Modified:12 Dec 2013 21:36

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