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MA: Magnetismus
MA 29: Magnetische Materialien
MA 29.9: Talk
Tuesday, March 8, 2005, 17:15–17:30, TU A060
Influence of melt convection on microstructure evolution of Nd-Fe-B alloys using forced crucible rotation technique — •Kaushik Biswas1, Regina Hermann1, Octavian Filip1, Jochen Werner1, Gunther Gerbeth2, and Janis Priede2 — 1Institute for Solid State and Materials Research (IFW) Dresden — 2Forschungszentrum Rossendorf e.V., Dresden
The forced crucible rotation technique has been applied to the solidification of Nd-Fe-B alloys. Specially sealed samples were subjected to well-defined forced rotation during induction heating and solidification. The resulting microstructure of the Nd-Fe-B alloys in consideration of melt convection has been investigated using scanning electron probe microscopy. The determination of the α-Fe volume fraction by measuring the magnetic moment in a vibrating sample magnetometer (VSM) resulted in a distinct reduction of the α-Fe volume fraction in samples with high crucible rotation frequencies. Furthermore, a new category of experiment has been started where a tailored magnetic field was applied in order to study the microstructure evolution due to an enhancement or suppression of the melt convection by additional alternating magnetic fields.