Syntheses and Fundamental Properties of Cr/Mo-Adoped Fe-Rich Alloys With Metastable Phase and Saturation Magnetization Near 1.9 T

The Fe-rich alloys of Fe_90-xSi₅B₅M_x (M= Cr or Mo; x=1, 2) are synthesized in the present study. The as-spun structure mainly consists of bcc phase plus a minor amount of metastable phase (Fe₃B and/or Fe₂₃B₆). Comparing with the base alloy Fe₉₀Si₅B₅, the corrosion resistance is improved significantly due to the formation of the passive film. Saturation magnetic flux density reaches 1.9 T for the melt-spun alloys Fe₈₉Mo₁Si₅B₅. The alloys present a nearly constant high permeability in a rather high magnetic field up to coercive field which can be used as a new kind of sensor material with good fundamental properties and low cost.

Keywords:
Fe-rich metastable alloys; Magnetic sensor materials; High Bs; Corrosion resistance