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The role of fluid flow and intermetallic phases in the formation of the primary Al-phase in AlSi alloys

Mikolajczak, Piotr and Ratke, Lorenz (2011) The role of fluid flow and intermetallic phases in the formation of the primary Al-phase in AlSi alloys. In: IOP Conf. Series: Materials Science and Engineering, 27 (012024). IOP Publishing Ltd, UK. ICASP 3, 7.-10. June 2011, Rolduc, Netherlands. ISSN 1757-899X

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Official URL: http://iopscience.iop.org/1757-899X/27/1/012024

Abstract

In secondary AlSi alloys, the presence of small amounts of Fe causes the formation of intermetallic phases, which have a negative effect on mechanical and physical properties of castings. To understand the effect of fluid flow on the microstructure and intermetallic phases, Al-5/7/9 wt pct Si 0.2/0.5/1.0 wt pct Fe alloys have been directionally solidified under defined thermal (gradient 3 K/mm, solidification velocity 0.04 mm/s) and fluid flow (rotating magnetic field 6 mT) conditions. The primary α-Al phase and intermetallic phases were studied using light microscopy and SEM with EDX. The influence of fluid flow and intermetallic phases (β- Al5FeSi) on microstructure was characterized by changes of primary and secondary dendrite arm spacing and specific surface area of the dendrites. We observe a pronounced effect of flow on the length of the intermetallic precipitates, a macro-segregation Fe and Si and even small amounts of iron and thus intermetallics reduce possible effects of flow on microstructural parameters.

Document Type:Conference or Workshop Item (Speech, Paper)
Title:The role of fluid flow and intermetallic phases in the formation of the primary Al-phase in AlSi alloys
Authors:
AuthorsInstitution or Email of Authors
Mikolajczak, PiotrUNSPECIFIED
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, UK
ISSN:1757-899X
Status:Published
Keywords:intermetallic phases, Al-castings, AlSi alloys, fluid flow
Event Title:ICASP 3
Event Location:Rolduc, Netherlands
Event Type:international Conference
Event Dates:7.-10. June 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 Materialforschung unter Mikro-g
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Physics in Space
Deposited By: Prof. Lorenz Ratke
Deposited On:31 Jan 2012 15:02
Last Modified:12 Dec 2013 21:36

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