Ferromagnetic element microalloying and clustering effects in high Bs Fe-based amorphous alloys

Abstract

Fe83(Cox,Niy)(B11Si2P3C1)1-x,y/17 (x, y=1–3) amorphous alloys with high saturation magnetic flux density (Bs) and excellent soft-magnetic properties were developed and then the microalloying and clustering effects were explored. The microalloying of Co and Ni improves the Bs from 1.65T to 1.67–1.72T and 1.66–1.68T, respectively. The Ni-doped alloys exhibit better soft-magnetic properties, containing a low coercivity (Hc) of about 5.0A/m and a high Effective permeability (μe) of (8–10)×103, whereas the microalloying of Co leads to a deteriorative Hc of 5.0–13.0A/m and a μe of (5–8)×103. Moreover, microalloying of Ni can increase the ductile-brittle transition (DBT) temperature of the ribbons, while a totally opposite effect is found in the Co-doped alloys. The formation of dense α-Fe(Co,Ni) clusters during annealing process is used to explain the distinct effects of Co and Ni microalloying on the magnetic properties and bending toughness.