Magnetic properties and microstructure of nanocrystalline bcc Fe-M-B (M=Zr,Hf,Nb) alloys

摘要: Abstract Some nanocrystalline Fe-based soft magnetic alloys have recently been found that exhibit high flux density (Bs) combined with good properties. Among these alloys, the highest Bs permeability (μe) has achieved for Fe-Zr-B ternary because an amorphous phase Fe concentrations higher than of other is obtained owing to glass-forming ability Zr and formation a bcc without additional nonmagnetic elements Cu, Nb, or Ge. For example, μe (1 kHz) are 1.7 T 14000, respectively, Fe91Zr7B2. Furthermore, we similar structure in Fe-M-B (M = Hf, Nb) nearly same properties as alloys. The changes function annealing temperature Fe90Zr7B3, Fe89Hf7B4 Fe84Nb7B9 very there no difference crystallization behavior three values at 1 kHz attained 22000 1.63 32000 1.59 Fe89Hf7B4, 1.49 Fe84Nb7B9. core losses 50 Hz, 0.2–1.4 frequency range 10–300 considerably lower those Fe-3%Si now use materials various transformers.