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Effect of Travelling Magnetic Fields on the Dendritic Microstructure of AlSi and AlSiMn

Orth, Andreas and Ratke, Lorenz (2013) Effect of Travelling Magnetic Fields on the Dendritic Microstructure of AlSi and AlSiMn. In: Materials Science Forum, 765, pp. 235-240. Trans Tech Publications, Switzerland. Sixth International Light Metals Technology Conference (LMT2013), 24. - 26. Jul. 2013, Old Windsor, United Kingdom. doi: 10.4028/www.scientific.net/MSF.765.235. ISBN 978-303571208-7. ISSN 0255-5476.

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Official URL: http://www.scientific.net/MSF.765.235


The microstructure formation of AlSi alloys is known to be sensitive to specific solidification conditions. In particular, small fractions of heavier alloying atoms can lead to the precipitation of intermetallic phases. Moreover, the mainly dendritic structure is also sensitive to fluid flow in the melt. These two factors and their mutual influence is examined in this paper. The solidification of AlSi7 and AlSi7Mn1 samples was studied while inducing fluid flow by a traveling magnetic field (TMF) of approximately 5 mT strength, traveling up or down the sample axis. All samples were molten and directionally solidified at 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 silica aerogel crucible permitted optical verification of the solidification velocity. Cross sections were cut from the processed samples and the microstructure analyzed using light microscopy and SEM-EDX. From these images, values for the primary, secondary and tertiary dendrite arm spacing were retrieved. Results are presented which show a clear effect of the TMF-induced fluid flow on the binary samples, but almost none for the ternary alloy. Finally, an explanation proposing a process of precipitate particle pushing is given.

Item URL in elib:https://elib.dlr.de/83261/
Document Type:Conference or Workshop Item (Paper)
Title:Effect of Travelling Magnetic Fields on the Dendritic Microstructure of AlSi and AlSiMn
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Journal or Publication Title:Materials Science Forum
Refereed publication:No
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
Page Range:pp. 235-240
Publisher:Trans Tech Publications, Switzerland
Series Name:Materials Science Forum
Keywords:AlSi alloys, Directional solidification, Intermetallic phases, Travelling magnetic field
Event Title:Sixth International Light Metals Technology Conference (LMT2013)
Event Location:Old Windsor, United Kingdom
Event Type:international Conference
Event Dates:24. - 26. Jul. 2013
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 - Research under Space Conditions
DLR - Research theme (Project):R - Vorhaben Materialwissenschaftliche Forschung (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Physics in Space > Scientific Experiments MP
Deposited By: Dennstedt, Dr. Anne
Deposited On:17 Jul 2013 08:44
Last Modified:18 Jul 2023 12:36

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