Publications Repository - Helmholtz-Zentrum Dresden-Rossendorf

2 Publications
Influence of melt convection on the microstructure of levitated and undercooled Nd-Fe-B alloys
Fillip, O.; Hermann, R.; Gerbeth, G.; Priede, J.; Shatrov, V.; Güth, A.; Schultz, L.;
The influence of melt rotation on the microstructure formation of Nd-Fe-B alloys, mainly the volume fraction and grain size of the a-Fe phase, has been investigated using the electromagnetic levitation technique which allows the in-situ measurement of the solidification kinetics containerlessly. Samples were subjected to a strong rotation during levitation and compared to fixed samples without additional sample rotation in the levitation facility. Additionally, experiments have been carried out where specially sealed samples were subjected to a well-defined forced rotation. A distinct reduction of the a-Fe volume fraction in samples with strong rotation was observed by measuring the magnetic moment in a vibrating sample magnetometer (VSM). The influence of cooling rate and undercooling level on microstructure formation and phase distribution has been investigated as well. 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.
  • Lecture (Conference)
    „Int. Conference on Magnetism“, Rom, Juli 2003
  • Journal of Magnetism and Magnetic Materials 272-276(2004)Suppl. 1, 1857-1858

Publ.-Id: 5203 - Permalink