| [(Fe0.5Co0.5)0.75B0.20Si0.05]96Nb4 soft magnetic bulk metallic glasses were prepared by fluxing and water-quenching in a silica tube. Dimension of the bulk metallic glass specimens was up to 7.7 mm in diameter, which is about 1.5 times larger than those prepared by Cu mold-casting. The critical cooling rate of [(Fe0.5Co0.5)0.75B0.20Si0.05]96Nb4 alloys with fluxing for forming a metallic glass phase was 150 - 170 K/s, which was considerably smaller than that without fluxing. Saturation magnetization was 1.13 T, and coercivity was lower than 20 A/m. Fluxing suppressed heterogeneous nucleation by isolating the nucleation sites from the molten alloys and improved their glass-forming ability. |
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