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Effects of controlled convections on dendritic microstructure and segregation during microgravity solidification

Steinbach, Sonja and Ratke, Lorenz (2007) Effects of controlled convections on dendritic microstructure and segregation during microgravity solidification. ESA-SP 647, 647, pp. 373-378. ESA Publications.

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Abstract

The effect of fluid flow on the microstructure formation in Al-cast alloys is studied experimentally: During three sounding rocket missions (TEXUS 39, TEXUS 41 and MAXUS 7) four samples of the composition Al-6wt.% Si were directionally solidified upwards under a medium temperature gradient (4K/mm) at constant solidification velocities (0.06 and 0.12mm/s) without and under the influence of forced fluid flow conditions to compare diffusive solidification conditions with convective ones. The paper shows that experiments under microgravity conditions yield other microstructures as experiments under earth conditions (with and without fluid flow): The secondary dendrite arm spacing was found to decrease, as the convection effects were reduced in microgravity. For high fluid flow velocity a change to pure eutectic solidification at the axis of the samples is observed.

Document Type:Article
Title:Effects of controlled convections on dendritic microstructure and segregation during microgravity solidification
Authors:
AuthorsInstitution or Email of Authors
Steinbach, SonjaUNSPECIFIED
Ratke, LorenzUNSPECIFIED
Date:June 2007
Journal or Publication Title:ESA-SP 647
Refereed publication:No
In SCOPUS:No
In ISI Web of Science:No
Volume:647
Page Range:pp. 373-378
Publisher:ESA Publications
Series Name:Special Publications
Status:Published
Keywords:directional solidification, aluminum alloys, microgravity, fluid flow, rotating magnetic field, dendrite spacing
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 > Institute of Space Simulation > Center for Solidification of Undercooled Melts (ZEUS)
Deposited By: Dr.rer.nat. Sonja Steinbach
Deposited On:17 Apr 2008
Last Modified:27 Apr 2009 14:04

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