Ratke, Lorenz and Genau, Amber and Steinbach, Sonja (2009) Flow effects on the dendritic microstructure of AlSi-base alloys. Transactions of the Indian Institute of Metals, 62 (4-5), pp. 337-341. Springer Nature. ISSN 0972-2815.
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Abstract
Fluid flow changes heat and mass transport during solidification, thereby affecting the evolution of the microstructure. In order to quantify effects of convection, it is important that fluid flow can be modified experimentally. We performed directional solidification experiments with binary AlSi alloys of different compositions, using a microgravity environment for diffusive solidification and adding rotating magnetic fields to generate flow. Flow velocities up to 10 mm/s and various solidification velocities were realized while maintaining a constant temperature gradient at the solid-liquid interface. The microstructure observed in samples processed on earth and in space is characterized by primary and secondary dendrite arm spacing and the fractal dimension of the dendrites. It is found that fluid flow usually accelerates growth and coarsening of the dendritic structures and leads to new kinetic laws. The branching of dendritic networks, however, is hardly affected by flow.
Item URL in elib: | https://elib.dlr.de/61098/ | ||||||||||||||||
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Document Type: | Article | ||||||||||||||||
Title: | Flow effects on the dendritic microstructure of AlSi-base alloys | ||||||||||||||||
Authors: |
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Date: | November 2009 | ||||||||||||||||
Journal or Publication Title: | Transactions of the Indian Institute of Metals | ||||||||||||||||
Refereed publication: | Yes | ||||||||||||||||
Open Access: | No | ||||||||||||||||
Gold Open Access: | No | ||||||||||||||||
In SCOPUS: | Yes | ||||||||||||||||
In ISI Web of Science: | Yes | ||||||||||||||||
Volume: | 62 | ||||||||||||||||
Page Range: | pp. 337-341 | ||||||||||||||||
Publisher: | Springer Nature | ||||||||||||||||
ISSN: | 0972-2815 | ||||||||||||||||
Status: | Published | ||||||||||||||||
Keywords: | Dendritic solidification, mushy zone, fluid flow, rotating magnetic fields, fractals | ||||||||||||||||
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 | ||||||||||||||||
Deposited By: | Ratke, Prof. Lorenz | ||||||||||||||||
Deposited On: | 25 Nov 2009 10:49 | ||||||||||||||||
Last Modified: | 20 Jun 2024 13:54 |
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