حسین رعنایی

In this study, microstructural evolution, mechanism of nanostructure formation and magnetic behavior of nanostructured Fe50Co30Ni20 alloy prepared by mechanical alloying (MA) were investigated. The structural and magnetic properties have been investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM) and vibrating sample magnetometer (VSM). X-ray diffraction showed that during mechanical alloying process the Fe-based solid solution with BCC lattice was formed after 16 h of milling. The powders exhibited a minimum crystallite size of ~ 21.6 nm after 16 h. Moreover, after milling time of 48 h, the lattice strain and volume fraction of grain boundary reaches to about 0.35 % and 3.48 %. Grain size refinement enhances magnetization saturation to about 133.24 emu/g and coercivity to approximately 297.76 Oe for milling time 2 and 48 h, respectively. Remanent magnetization and Remanence–to-saturation ratio values increases during mechanical alloying processes.