Abstract
{[(Fe0.5Co0.5)0.75Si0.05B0.20]0.96Nb0.04}100-xCux (x = 0, 1, 1.5 and 2) alloys with different rapid solidification conditions were prepared by copper mold casting and melt spinning. The structures, the thermal and the magnetic properties were studied by X-ray diffraction, differential scanning calorimetry and vibrating sample magnetometry, respectively. Minor Cu addition obviously depresses the glass-forming ability of the alloys (critical glassy diameter dc < 1 mm) compared with [(Fe0.5Co0.5)0.75Si0.05B0.20]96 Nb4 (dc = 3 mm). The effect of Cu addition on the evolution of crystalline phases corresponding to different rapid solidification conditions was evaluated. The existence of (Fe,Co), (Fe,Co)3B, (Fe,Co)2B and (Fe,Co)23B6 crystalline phases in {[(Fe0.5Co0.5)0.75Si0.05B0.20]0.96 Nb0.04}100-x Cux alloys influences the saturation magnetization compared with the corresponding glassy alloys.
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