Other
Scientific paper
Aug 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005esasp.590..521s&link_type=abstract
In: 17th ESA Symposium on European Rocket and Balloon Programmes and Related Research, 30 May - 2 June 2005, Sandefjord, Norway.
Other
Microgravity
Scientific paper
Since heat and mass transport determines fully the solidification microstructure, it is essential to perfectly control both in a controlled manner. One extreme is experimentation under microgravity conditions, in which all sources of fluid flow are eliminated; the other extreme is microgravity with an induced fluid flow being fully controlled by the experimenter. The first move was done with the experiment on TEXUS 39. A ARTEX facility under diffuse material transport conditions. In the ARTEXplus facility, flown on TEXUS 41, an implemented coil system generates a controlled fluid flow in the melt. The experiment on TEXUS 41 should lead to a direct comparison of the effect of controlled convective conditions and pure diffusive growth conditions on microstructure development using the same alloy. A sample evaluation shows a decreasing of the primary spacing with increasing fluid flow whereas the secondary dendrite arm spacing increases.
Masslow Hans Dieter
Ratke Lorenz
Steinbach Sonja
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