Experimental study on interaction of fluid flow and solidification in Al-Si-Cu alloys
Steinbach, Sonja and Ratke, Lorenz (2007) Experimental study on interaction of fluid flow and solidification in Al-Si-Cu alloys. International Journal of Cast Metals Research, 20 (3), pp. 140-144. Maney Publishing. ISSN 1364-0461.
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A hypoeutectic Al-6wt.%Si-4wt.%Cu alloy was used in the present study to investigate the effect of controlled fluid flow conditions on the microstructure formation in cast Al-alloys experimentally. The alloy has been directionally solidified upwards under a medium temperature gradient (3K/mm) in an aerogel-based furnace facility over a range of constant solidification velocities (0.015-0.15mm/s). A coil system around the sample induces a homogeneous rotating magnetic field being able to generate a controlled fluid flow in the melt. The application of rotating magnetic fields during directional solidification results in a strong segregation effect: For high magnetic induction and therefore high fluid flow velocity an enrichment of solute is observed at the axis of the sample. The primary dendrite spacing decreases whereas the secondary dendrite arm spacing increases with increasing magnetic induction, clearly revealing the effects of convections on solidification kinetics.
|Title:||Experimental study on interaction of fluid flow and solidification in Al-Si-Cu alloys|
|Journal or Publication Title:||International Journal of Cast Metals Research|
|In ISI Web of Science:||Yes|
|Page Range:||pp. 140-144|
|Keywords:||Al-Si-Cu, solidification, fluid flow, electromagnetic stirring, dendrite spacing|
|HGF - Research field:||Aeronautics, Space and Transport|
|HGF - Program:||Space|
|HGF - Program Themes:||W FR - Forschung unter Weltraumbedingungen|
|DLR - Research area:||Space|
|DLR - Program:||W FR - Forschung unter Weltraumbedingungen|
|DLR - Research theme (Project):||W - Vorhaben Materialforschung unter Mikro-g (old)|
|Institutes and Institutions:||Institute of Materials Physics in Space|
|Deposited By:||Dr.rer.nat. Sonja Steinbach|
|Deposited On:||29 Nov 2007|
|Last Modified:||27 Apr 2009 14:23|
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