Bulk glassy (Fe0.474Co0.474Nb0.052)100−(B0.8Si0.2) alloys prepared using commercial raw materials

Abstract The alloy compositions have been optimized by modifying the B and Si contents in (Fe 0.474 Co 0.474 Nb 0.052 ) 100 − x (B 0.8 Si 0.2 ) 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, (Fe 0.474 Co 0.474 Nb 0.052 ) 100 − x (B 0.8 Si 0.2 ) x bulk glassy alloys with diameters up to 5 mm were synthesized for the composition range of x from 22 to 28. In addition to high glass-forming ability (GFA), the (Fe 0.474 Co 0.474 Nb 0.052 ) 100 − x (B 0.8 Si 0.2 ) x glassy alloys exhibit good soft magnetic properties as well, i.e., rather high saturation magnetization of 0.84–1.07 T, low coercive field of 1.8–3.2 A/m, high initial permeability of 10100–24100 at 1 kHz under a field of 1 A/m and Curie temperature of 620–730 K.