Abstract
Fully glassy rods of [(FexCo1−x)0.75Si0.05B0.20]94Nb6 alloys (x = 0.4, 0.5 and 0.6) with diameters up to 2 mm were produced by copper mould casting. The effect of the Fe content (x) in these glassy alloys on the thermal stability and melting behaviour was studied by differential scanning calorimetry. The crystallization behaviour of the glassy alloys during constant-rate heating was evaluated using x-ray diffraction. The first crystallization stage is related to the precipitation of a metastable (Fe,Co)23B6 crystalline phase for all alloys. The activation energy derived from Kissinger plots of the first crystallization peak for the three glassy alloys indicates that the Co-rich glassy alloy (x = 0.4) crystallizes easily during heating. The influence of crystallization on saturation magnetization (Ms), coercivity (Hc) and Curie temperature (Tc) was evaluated, indicating that precipitation of (Fe,Co)23B6 not only improves Ms and Tc but also increases Hc.
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