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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.
| Item URL in elib: | https://elib.dlr.de/74721/ | |||||||||
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| 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: |
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| Date: | December 2011 | |||||||||
| Journal or Publication Title: | IOP Conf. Series: Materials Science and Engineering | |||||||||
| Refereed publication: | Yes | |||||||||
| Open Access: | Yes | |||||||||
| Gold Open Access: | No | |||||||||
| In SCOPUS: | No | |||||||||
| In ISI Web of Science: | Yes | |||||||||
| Volume: | 27 | |||||||||
| Editors: |
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| 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 (old) | |||||||||
| Location: | Köln-Porz | |||||||||
| Institutes and Institutions: | Institute of Materials Physics in Space | |||||||||
| Deposited By: | Ratke, Prof. Lorenz | |||||||||
| Deposited On: | 31 Jan 2012 15:02 | |||||||||
| Last Modified: | 31 Jul 2019 19:35 |
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