Development of FeNiNbSiBP bulk metallic glassy alloys with excellent magnetic properties and high glass forming ability evaluated by different criterions

Fe38Ni38Nb2.5B21.5−x−yPxSiy (x, y = 1-8) bulk metallic glassy alloys with high glass forming ability and excellent magnetic properties were developed. Bulk samples with maximum diameters of 3 mm are fabricated by copper mold casting method. The glassy alloys have large ΔTx of 40-70 K. The alloys exhibit excellent magnetic properties like extremely low Hc of 0.5-0.8 A/m, high μe of 1.6-2.85 × 104 and comparatively high Bs of 0.6-0.8 T which changes regularly with the content variations of P, B and Si. By ascertaining applicability of the empirical GFA criterions, Trg, α, β and γ can be used in evaluating the GFA of FeNiBSiPNb system alloys.