Influence of melt convection on the microstructure of levitated and undercooled Nd–Fe–B alloys

The influence of melt rotation on the microstructure formation of Nd–Fe–B alloys, mainly the volume fraction and grain size of the α-Fe phase, is investigated using the electromagnetic levitation technique. Molten droplets were subjected to a strong rotation during levitation and compared to fixed s...

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Bibliographic Details
Published in:Journal of magnetism and magnetic materials 2004-05, Vol.272-276, p.E1857-E1858
Main Authors: Filip, O., Hermann, R., Gerbeth, G., Priede, J., Shatrov, V., Gueth, A., Schultz, L.
Format: Article
Language:English
Subjects:
Levitation
Melt convection
Nd–Fe–B magnets
Solidification
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Summary:The influence of melt rotation on the microstructure formation of Nd–Fe–B alloys, mainly the volume fraction and grain size of the α-Fe phase, is investigated using the electromagnetic levitation technique. Molten droplets were subjected to a strong rotation during levitation and compared to fixed samples without rotation. Additionally, experiments have been carried out where sealed samples were subjected to a well-defined forced rotation. A distinct reduction of the α-Fe volume fraction in samples with strong rotation was observed by measuring the magnetic moment. The melt flow in a levitated droplet is studied numerically under the additional effect of a global sample rotation which may give a strong suppression of internal motions.
ISSN:0304-8853
DOI:10.1016/j.jmmm.2003.12.1070