Dresden 2009 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 11: Magnetic Materials
MA 11.15: Vortrag
Montag, 23. März 2009, 19:00–19:15, HSZ 103
Thermal stability and magnetic properties of Fe-Co-B-Si-Nb glassy alloys — •Mihai Stoica1, Ran Li1, and Jürgen Eckert1,2 — 1IFW Dresden, Institute for Complex Materials, P.O. Box 270116, D-01171 Dresden, Germany — 2TU Dresden, Institute of Materials Science, D-01062 Dresden, Germany
The fully glassy rods of [(FexCo1−x)0.75Si0.05B0.25]94Nb6 alloys (x = 0.4, 0.5 and 0.6) in diameters up to 2 mm were produced by copper mold casting. The effect of Fe substitution in these glassy alloys on thermal stability and melting behavior were studied by differential scanning calorimetry. Phase evolution of the glassy alloys during heating crystallization process was evaluated using X-rays diffraction. The first crystallization stage results in the precipitation of metastable (Fe,Co)23B6 crystalline phase in the glassy alloys. The behaviour of the glassy alloys in DC applied field was investigated by means of vibrating sample magnetometer. The investigated samples are soft magnetic. Further, the influence of crystallization on the saturation magnetization (Ms), coercivity (Hc) and Curie temperature (Tc) were evaluated, which indicated that (Fe,Co)23B6 phase can improve the Ms and Tc, while also increase the Hc.