FeNiPBNb bulk glassy alloys with good soft-magnetic properties

The effects of Nb content on glass-forming ability (GFA) and soft-magnetic properties of (Fe _0.39Ni _0.39B _0.16P _0.06) _100-xNb _x (x = 0, 1, 1.5, 2, 2.5, 3 and 4) glassy alloys were investigated. By adjusting the Nb content, the GFA and soft-magnetic properties are effectively improved. Bulk glassy alloys with diameters up to 2.5 mm were synthesized. The FeNi-based glassy alloys exhibit excellent soft-magnetic properties i.e., low coercivity of 1-1.8 A/m and high saturation magnetization of 0.66-0.85 T. The [(Fe _0.5Ni _0.5) _0.78B _0.16P _0.06] _97.5Nb _2.5 glassy alloy also exhibits high effective permeability of 25,700 with excellent frequency stability. In addition to high GFA and good soft-magnetic properties, the alloy shows a constant differential permeability of about 17,700 G/Oe and high fracture strength of 3150 MPa.