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

Orth, Andreas und 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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Offizielle URL: http://iopscience.iop.org/1757-899X/27/1/012044

Kurzfassung

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.

Dokumentart:Konferenzbeitrag (Paper, Poster)
Titel:Influence of TMF-induced fluid flow on the microstructure of Al-Si7-Mn1 wt.% alloy
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Orth, AndreasNICHT SPEZIFIZIERT
Ratke, LorenzNICHT SPEZIFIZIERT
Datum:Dezember 2011
Erschienen in:IOP Conf. Series: Materials Science and Engineering
Referierte Publikation:Ja
In ISI Web of Science:Ja
Band:27
Herausgeber:
HerausgeberInstitution und/oder E-Mail-Adresse der Herausgeber
Ratke, LorenzNICHT SPEZIFIZIERT
Zimmermann, GerhardAccess eV, Aachen
Verlag:IOP Publishing Ltd
ISSN:1757-899X
Status:veröffentlicht
Stichwörter:intermetallic phases, Al-Si cast alloys, fluid flow, travelling magnetic fields, microstructure, directional solidification
Veranstaltungstitel:ICASP 3
Veranstaltungsort:Rolduc, Netherlands
Veranstaltungsart:internationale Konferenz
Veranstaltungsdatum:7.-10.2011
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Raumfahrt
HGF - Programmthema:Forschung unter Weltraumbedingungen
DLR - Schwerpunkt:Raumfahrt
DLR - Forschungsgebiet:R FR - Forschung unter Weltraumbedingungen
DLR - Teilgebiet (Projekt, Vorhaben):R - Vorhaben Materialwissenschaftliche Forschung
Standort: Köln-Porz
Institute & Einrichtungen:Institut für Materialphysik im Weltraum
Hinterlegt von: Prof. Lorenz Ratke
Hinterlegt am:31 Jan 2012 15:01
Letzte Änderung:12 Dez 2013 21:36

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