Dresden 2003 – wissenschaftliches Programm
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M: Metallphysik
M 18: Symposium: Phasenumwandlungen in Schmelzen VII
M 18.1: Vortrag
Dienstag, 25. März 2003, 14:45–15:00, IFW A
Motion of a Nd-Fe-B melt in levitated or float-zone operated samples and its control — •Gunter Gerbeth1, Janis Priede1, Victor Shatrov1, Regina Hermann2, and Octavian Filip2 — 1Forschungszentrum Rossendorf, PF 510119, 01324 Dresden — 2IFW Dresden, Institut für Metallische Werkstoffe, PF 270016, 01171 Dresden
The microstructure of Nd-Fe-B alloys changes if the convection in the melt varies. A controlled influence on the melt flow is possible via magnetic fields or sample rotations. The experimental techniques behind are the electromagnetic levitation, mechanical sample rotations and a specially designed float-zone arrangement. We present theoretical/numerical results for the melt convection in those configurations. The melt flow in a levitated droplet is studied under the additional effect of a global sample rotation which may lead to a strong suppression of internal motions. A specially designed two-phase stirrer offers a strong influence on the melt flow in the float-zone facility.