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Furnace Technology for Experiments on Sounding Rockets: Directional Solidification on Al-cast Alloys in ARTEX

Steinbach, Sonja and Ratke, Lorenz (2008) Furnace Technology for Experiments on Sounding Rockets: Directional Solidification on Al-cast Alloys in ARTEX. In: Journal of The Japan Society of Microgravity Application, 25 (3), pp. 291-296. The Japan Society of Microgravity Application. Third International Symposium on Physical Sciences in Space 2007, 2007-10-22 - 2007-10-26, Nara, Japan. ISSN 09153616

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Abstract

The effect of controlled 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). The application of rotating magnetic fields (RMF) during solidification offers the possibility to create defined flow conditions in solidification processing in microgravity 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. The forced fluid flow conditions result in pronounced macrosegregation effects. For high fluid flow velocity a change to pure eutectic solidification at the axis of the samples is observed.

Document Type:Conference or Workshop Item (Speech)
Title:Furnace Technology for Experiments on Sounding Rockets: Directional Solidification on Al-cast Alloys in ARTEX
Authors:
AuthorsInstitution or Email of Authors
Steinbach, SonjaUNSPECIFIED
Ratke, LorenzUNSPECIFIED
Date:August 2008
Journal or Publication Title:Journal of The Japan Society of Microgravity Application
Refereed publication:Yes
In ISI Web of Science:No
Volume:25
Page Range:pp. 291-296
Editors:
EditorsEmail
Odawara, O.UNSPECIFIED
Kuribayashi, K.UNSPECIFIED
Publisher:The Japan Society of Microgravity Application
ISSN:09153616
Status:Published
Keywords:microgravity, solidification, convection, alloys
Event Title:Third International Symposium on Physical Sciences in Space 2007
Event Location:Nara, Japan
Event Type:international Conference
Event Dates:2007-10-22 - 2007-10-26
Organizer:JAXA
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: Dr.rer.nat. Sonja Steinbach
Deposited On:22 Aug 2008
Last Modified:27 Apr 2009 14:04

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