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. 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.
|Title:||Flow effects on the dendritic microstructure of AlSi-base alloys|
|Journal or Publication Title:||Transactions of the Indian Institute of Metals|
|In ISI Web of Science:||Yes|
|Page Range:||pp. 337-341|
|Keywords:||Dendritic solidification, mushy zone, fluid flow, rotating magnetic fields, fractals|
|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:||Prof. Lorenz Ratke|
|Deposited On:||25 Nov 2009 10:49|
|Last Modified:||26 Feb 2013 15:02|
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