Abstract
The alloy compositions have been optimized by modifying the B and Si contents in (Fe0.474Co0.474Nb0.052)100−x(B0.8Si0.2)x alloy system with commercial materials. The thermal stability of the supercooled liquid improves with the increased B and Si contents from x=22 to 28. The composition of the alloy with x=26 is close to a eutectic point. By copper mold casting, (Fe0.474Co0.474Nb0.052)100−x(B0.8Si0.2)x bulk glassy alloys with diameters up to 5mm were synthesized for the composition range of x from 22 to 28. In addition to high glass-forming ability (GFA), the (Fe0.474Co0.474Nb0.052)100−x(B0.8Si0.2)x glassy alloys exhibit good soft magnetic properties as well, i.e., rather high saturation magnetization of 0.84–1.07T, low coercive field of 1.8–3.2A/m, high initial permeability of 10100–24100 at 1kHz under a field of 1A/m and Curie temperature of 620–730K.
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