Effects of P addition on the glass forming ability, crystallization behaviour and soft magnetic properties of FeNi-based amorphous alloy

In this work, the effects of P substitution on the thermal stability, crystallization behavior, and magnetic properties of melt-spun and annealed (Fe40Ni40Si9.5B9.5-xPxCu1)0.97Nb0.03 (x = 0, 1, 2, 3 and 4) alloy ribbons the have been explored. All alloys can be readily fabricated into completely amorphous structures with good surface quality by the melt-spinning method. Thermodynamic investigation reveals that proper P addition not only favors the amorphous formation but also enhance anti-crystallization ability. These alloys show excellent magnetic properties after optimal annealing, i.e., low coercivity (Hc) of 0.06–1.16 A/m, high permeability (μe) of 11680–17100 and moderate saturation magnetization (Ms) of 85.4–97.6 Am2/kg. Besides, the substitution of minor P metalloids facilitates homogeneous precipitation of α-Fe nanocrystals. This work helps us to develop a novel the FeNi-based alloy is vital important for achieving excellent soft magnetic properties.