Glass-Forming Ability and Magnetic Properties of <

The glass-forming ability (GFA) and the magnetic properties of the (Fe_0.80Co_0.20)_96-xB_xSi₁Nb_3-yY_y(x = 15, 17) amorphous alloys have been studied. It was confirmed that GFA is enhanced by replacing Nb with Y. Yttrium gives a complex effect on the magnetization. When Y content is increased, the saturation mass magnetization (σ_s) decreases first. However, the σ_s then increases and exhibits a maximum ~2 at% Y. The value of σ_s of the alloy with x = 17 and y = 2 in an as-quenched state is 211 × 10_-6 Wb m/kg, which is slightly larger than that of the Y-free alloy with the same B content. The values of the coercivity of these alloys are less than 10 A/m in an as-quenched state. The coercivity shows a tendency to decrease with increasing Y content, which means the increase of GFA. These results indicate that the partial replacement of Nb by Y in the Fe-Co-B-Si-Nb alloys is useful to the simultaneous achievement of high GFA, high σ_s, and good soft magnetic properties.