Abstract
Novel Fe76-xB10P5Si9Cux (x = 0, 0.5, 1 and 1.5 at.%) amorphous alloys with low Fe content were successfully synthesized with aim of investigating the crystallization behaviors and magnetic properties. Thermodynamic behavior revealed that Cu substitution triggered the transition of primary precipitation phase from Fe23B6 to α-Fe, which favored the high saturation magnetic flux density (Bs) of alloys after annealing. Through adjustment of Fe/Cu ratio, the Fe75B10P5Si9Cu1 alloy exhibited the attractive and tunable magnetic properties, i.e. the high effective permeability (μe) of 25000 and low coercivity (Hc) of 1.3 A/m in amorphous state as well as the high Bs of 1.62 T and μe of 18000 in crystallization state. The high Bs could be attributed to the uniform refined composite microstructure, whereas the excellent magnetic softness characterized by magnetic domain patterns was determined by magnetic anisotropy induced via different atomic structures. Such tunable performance can promise alloy a potential soft-magnetic material to meet the requirement of most electric devices.
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