Structural evolution and magnetic properties of nanocrystalline 50 Permalloy powders prepared by mechanical alloying

摘要: Abstract FeNi-based alloys commonly called Permalloys are interesting in their applications as soft magnetic materials with low coercivity and high permeability. In this study, nanocrystalline Fe–50 wt.% Ni alloy powders were prepared using a planetary ball mill at different milling times. The evolution of the microstructure properties during process studied by X-ray diffraction technique, scanning electron microscope, transmission microscope vibrating sample magnetometer. results indicate that course Fe mixture, FCC γ-(Fe, Ni) phase average crystallite size 15 nm, particle 39 μm, nonuniform lattice strain 0.45% parameter 0.36062 nm formed after 24 h time. Although as-synthesized Permalloy powder is smaller than exchange length, expected from Herzer’s random anisotropy model not observed. Among reasons, residual stress, formation contamination suggested possible causes, which affect both saturation magnetization.