Journal
JOM
Volume 69, Issue 8, Pages 1303-1310Publisher
SPRINGER
DOI: 10.1007/s11837-017-2402-y
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Funding
- ESA
- German Research Foundation DFG [HE1601/26]
- German Space Center Space Management [50WM1541]
- Russian Science Foundation [16-11-10095]
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Containerless processing of droplets and drops by atomization and electromagnetic levitation are applied to undercool metallic melts and alloys prior to solidification. Heterogeneous nucleation on crucible walls is completely avoided giving access to large undercoolings. Experiments are performed both under terrestrial (1 g) conditions and in reduced gravity (A mu g) as well. Microgravity conditions are realized by the free fall of small droplets during atomization of a spray of droplets, individual drops in a drop tube and by electromagnetic levitation of drops during parabolic flights, sounding rocket missions, and using the electro-magnetic levitator multi-user facility on board the International Space Station. The comparison of both sets of experiments in 1 g and A mu g leads to an estimation of the influence of forced convection on dendrite growth kinetics and microstructure evolution.
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