Study of synthesis, structural and magnetic properties of nanostructured (Fe67 Ni33)70 Ti10 B20 alloy

Highlights: • The effect of milling time on Fe₄₉Ni₂₁Ti₁₀B₂₀ composition was investigated. • The coexistence between nanocrystalline and amorphous phases was observed. • The magnetic coercivity reached to a low value (≈35 Oe) at the early stage of milling time. • The heat treatment revealed an increment in coercivity value. Alloyed powders with combination of (Fe₆₇ Ni₃₃)₇₀ Ti₁₀ B₂₀ at different milling times are obtained. Structural, magnetic and thermal characterizations are performed by using X- ray diffraction, scanning electron microscope, energy dispersive X-ray spectroscopy, differential scanning calorimetry, transmission electron microscopy and vibrating sample magnetometer. It is indicated that the crystallite size is sharply decreases in the initial stage of milling process and the microstructure tends to nanocrystalline structure with increasing milling time. A rapid drop in saturation magnetization is observed after 48 h milling time, while coercivity value attains to a lowest value of about 33 Oe. Heat analysis of the milled sample at 120 h shows an endothermic peak. The coercivity of the 120 h annealed sample is increased as compared to the starting powders.