Hossein Raanaei

In this study, we investigate the structural, magnetic and magnetocaloric properties of nanocrystalline Fe-Al-based Alloys prepared by mechanical alloying. We employ various characterization techniques, including X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy dispersive X-ray spectroscopy (EDS), elemental mapping, scanning transmission electron microscope (STEM), and vibrating sample magnetometry (VSM) to analyze these properties. The powder morphology shows that for the powders at the final part of milling time, the particle size distribution falls into a narrower range compared to the powders at the initial time. The XRD analysis reveals the formation of a bcc iron-based solid solution structure after 80 h of milling for the alloy compositions. The powders exhibited a minimum crystallite size of 9.90 nm, 8.10 nm, 9.10 nm, 7.40, and 8.10 nm after 16 h of milling for Fe55Cu20Al25, (Fe55Cu20Al25)90B10, and Fe55Cr20Al25 compositions and 32 h of milling for Fe53Cu22Al25 and (Fe55Cr20Al25)90B10 compositions, respectively. Additionally, the maximum saturation magnetization for alloy compositions of Fe55Cu20Al25, Fe53Cu22Al25, (Fe55Cu20Al25)90B10, Fe55Cr20Al25, and (Fe55Cr20Al25)90B10 reach around 106.44 emu/g, 139.39 emu/g, 97.76 emu/g, 91.30 emu/g, and 105/51emu/g, respectively. The annealed samples exhibit structural ordering, as evidenced by the presence of Fe, Cu, CrO3 and FeCr2O4 crystal phases. The prepared alloys exhibit soft magnetic properties compared to previously investigated mechanically alloyed FeAl-based powders.