Physics
Scientific paper
Aug 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995adspr..16...95r&link_type=abstract
Advances in Space Research, Volume 16, Issue 8, p. 95-99.
Physics
2
Scientific paper
In the Multi-Furnace Assembly (MFA) of EURECA experiments were performed with molten Al-Pb alloys to investigate the self-similar coarsening process in liquid-liquid dispersions called Ostwald ripening. Al-Pb alloys with very low volume fractions of dispersed phase (0.5-1.0 Vol.%) were processed by annealing cylindrical samples within the liquid miscibility gap at 800 degC for 1h, 5h and 20h. The droplet size distribution prior to the experiment runs was centered around 1 micron diameter. After the annealing treatments in the MFA a coarsening of the droplets to sizes around 5-10 microns was observed. The droplets were, however, not evenly distributed in the samples. There was some drift which can be attributed to Marangoni motion. This was caused by a small temperature gradient of approximately 0.5 K/cm during the annealing treatment and some additional motion during heating and solidification of the samples. This lead in some sample to an enrichment of droplets at the surface of the samples. The results agree with similar results obtained in Spacelab 1 with Zn-Pb alloys. The coarsening is a superposition of diffusional Ostwald ripening and coagulation of droplets by Marangoni motion.
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