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On the Effect of Fluid Flow on Intermetallic Phases in Cast Aluminium Alloys

Ratke, Lorenz and Euskirchen, Natasja and Steinbach, Sonja (2006) On the Effect of Fluid Flow on Intermetallic Phases in Cast Aluminium Alloys. In: Aluminium Conference 2006. DGM. Aluminium Conference 2006, 2006-09-21 - 2006-09-22, Essen, Deutschland.

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Official URL: http://www.dgm.de/download/tg/780/780_46.pdf

Abstract

Technical Al-Si base cast alloys always contain amounts of Fe and Mn, especially alloys extracted from scrap. During casting, Fe and Mn containing intermetallics, such as Al-Fe, Al-Fe-Si and Al-Fe-Mn-Si phases, are formed between the aluminum dendrites. Fe and Mn-rich intermetallic phases with a needle to plate-like morphology strongly affect the interdendritic feeding. They induce porosity and shrinkage holes and also have detrimental effects on the mechanical properties in Al-Si alloys. In the paper we describe new research about the influence of controlled fluid flow on the morphology and spatial arrangement on intermetallic phases in cast Al-Si alloys. A binary Al-7wt.%Si, ternary Al-7wt.%Si-1wt.%Fe and Al-7wt.%Si-1wt.%Mn alloys were solidified over a range of solidification velocities (0.015- 0.18mm/s) at a constant temperature gradient of 3K/mm. Fluid flow was induced by a rotating magnetic field device introducing flow velocities in the range of mm/s. A comparison of alloys processed with and without artificial flow indicates a strong influence of the electromagnetic stirring on the primary dendrite and secondary dendrite arm spacings, beyond current theoretical understanding of flow effects. The paper presents the results and discusses the relevance to casting of scrap alloys.

Document Type:Conference or Workshop Item (Speech, Poster)
Title:On the Effect of Fluid Flow on Intermetallic Phases in Cast Aluminium Alloys
Authors:
AuthorsInstitution or Email of Authors
Ratke, LorenzUNSPECIFIED
Euskirchen, NatasjaUNSPECIFIED
Steinbach, SonjaUNSPECIFIED
Date:October 2006
Journal or Publication Title:Aluminium Conference 2006
Refereed publication:No
In ISI Web of Science:No
Publisher:DGM
Status:Published
Keywords:Intermetallische Phasen, Aluminium Gusslegierungen, Einfluss von Strömungen
Event Title:Aluminium Conference 2006
Event Location:Essen, Deutschland
Event Type:international Conference
Event Dates:2006-09-21 - 2006-09-22
Organizer:DGM
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:21 Aug 2007
Last Modified:12 Dec 2013 20:21

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