Effect of B to P concentration ratio on glass-forming ability and soft-magnetic properties in [(Fe0.5Ni0.5)0.78B0.22−xPx]97Nb3 glassy alloys

The effect of B to P concentration ratio on the glass-forming ability (GFA) and soft-magnetic properties of [(Fe0.5Ni0.5)0.78B0.22−xPx]97Nb3 (x = 0.01, 0.03, 0.05, 0.07 and 0.09) glassy alloys was investigated. By adjusting the concentration ratio of B to P, GFA and soft-magnetic properties are effectively improved. Bulk glassy alloys (BGAs) with diameters up to 1.5 mm were synthesized in the composition range of x = 0.03–0.07. In addition to high GFA, the FeNi-based glassy alloys exhibit excellent soft-magnetic properties, i.e., rather low Hc of 0.7–0.95 A/m, high μe of 17,200–24,300 and high saturation magnetization of 0.63–0.82 T. The [(Fe0.5Ni0.5)0.78B0.17P0.05]97Nb3 BGA exhibits high hardness of 890 kg/mm2. The improvement of GFA and soft-magnetic properties are derived from the enhanced atomic bonding nature and phase competing process in conjugation with precipitation of (Fe, Ni)23B6 phase with complex structure.