حسین رعنایی

This study explored the magnetic, microstructural, and thermal properties of a ball-milled Co-based alloy, Co49Fe21Ti8Nb4B18. A range of characterization methods was utilized, such as scanning electron microscopy, xray diffraction, high-resolution transmission electron microscopy, energy dispersive x-ray analysis, vibrating sample magnetometry, and differential scanning calorimetry. The analysis revealed a broadened peak in the XRD patterns, indicating the formation of a bcc-structure (Co, Fe, Ti, Nb, B) solid solution, with an average crystallite size of approximately 24.6 nm. Magnetic measurements showed that saturation magnetization increased steadily from 12 to 90 h, reaching about 140 emu/g after 120 h of milling. Coercivity values demonstrated a two-step increase, ultimately stabilizing around 101 Oe, which is relatively lower than those reported in previous studies. Notably, the annealed samples exhibited significantly softer magnetic behavior, with enhanced saturation magnetization and reduced coercivity compared to the as-milled samples. These findings suggest potential applications for this alloy in soft magnetic devices.