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

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 5 mm 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 0.84–1.07 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.

► The thermal stability of the supercooled liquid increased with increasing the B and Si contents.
► Bulk glassy alloys with diameters up to 5 mm were synthesized by copper mold casting.
► The (Fe0.474Co0.474Nb0.052)100 − x(B0.8Si0.2)x glassy alloys exhibit good soft magnetic properties.