Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe

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.