Berlin 2015 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 19: POSTER Ia
MA 19.19: Poster
Dienstag, 17. März 2015, 09:30–13:00, Poster A
Effect of Microstructure on Spinodal Decomposition and Magnetic Properties of Melt-Spun Alnico — •Konrad Loewe1, Michael Duerrschnabel2, Rajasekhar Madugundo3, George C. Hadjipanayis3, and Oliver Gutfleisch1,4 — 1TU Darmstadt, Materialwissenschaft, Alarich-Weiß-Str. 16, 64287 Darmstadt, Germany — 2TU Darmstadt, Angewandte Geowissenschaften, Schnittspahnstraße 9, 64287 Darmstadt , Germany — 3Department of Physics and Astronomy, University of Delaware, Newark, DE, USA — 4Fraunhofer ISC, IWKS Group Materials Recycling and Resource Strategy, Hanau, Germany
The aim of this work is to investigate the effect of very fine grain sizes on the spinodal decomposition in the Alnico system. Commercial Alnico 8 was melted and melt-spun with varying copper wheel speeds, which led to a grain size of around 2 micron. This value was further reduced to sub-micrometer size by a small addition of Boron (1at%). The spinodal decomposition was induced through a two-step annealing treatment under magnetic field in the range of 600-900°C. It was found that the nanometer-sized spinodal structures become bigger with increasing wheel speeds and smaller with the addition of Boron. Contrary to expectations, the coercivity of the sample containing Boron is slightly reduced compared to the one without it, which is attributed to the formation of unwanted secondary phases.