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Flow effects on the dendritic microstructure of AlSi-base alloys

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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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/
Document Type:Article
Title:Flow effects on the dendritic microstructure of AlSi-base alloys
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
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 ISI Web of Science:Yes
Page Range:pp. 337-341
Publisher:Springer Nature
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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