Abstract
Ni–Fe-based alloys (permalloys) are commonly used as soft magnetic materials, exhibiting high permeability, low coercivity, low magnetostriction and high-saturation magnetization. In particular, Ni–Fe–Mo alloys have high relative permeability and low eddy current losses. We have investigated the structure and magnetic properties of powders prepared by mechanical milling of NiFe (81 wt% of Ni) microcrystalline ribbon and NiFeMo (79 wt% of Ni, 16 wt% of Fe) swarfs in a high-energy planetary ball mill. The coercivity of NiFe rapidly increases up to 1600 A/m for 35 h and the coercivity of NiFeMo increases gradually up 1800 A/m for all time of milling (500 h). The XRD analysis revealed that there is major phase FeNi3 (with Curie temperature of 550 °C) as well as minor phases NiO and Fe3O4 for milled NiFe alloy. The milled NiFeMo alloy consists of FeNi3 phase and other phase, whose Curie temperature was detected by thermomagnetic analysis to be about 650 °C.
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