Structural and Magnetic Characteristics of Rapid Solidified Co78Zr17B2Si1M2 (M = W, Cr, Mo) alloys

This research explored the effects of W, Mo, and Cr elements on the structural and magnetic characteristics of Co₇₈Zr₁₇B₂Si₁M₂ (M?=?W, Cr, Mo) alloys. Toward this goal, vacuum arc melting technique was used to prepare the initial ingots, and rapid solidification process was followed by the melt-spinning technique. The samples were evaluated using X-ray diffractometer (XRD), field emission scanning electron microscopy (FESEM), differential scanning calorimetry (DSC), and vibrating sample magnetometer (VSM). Based on the results, the Co₅Zr magnetic phase with coercivity (Hc) and saturation magnetization (Ms) within 2.7–3?Oe and 30–42?emu/g was successfully formed in Co₇₈Zr₁₇B₂Si₁M₂ (M?=?W, Cr, Mo) systems during the melt-spinning process. Performing the annealing process at a temperature lower than 400?°C led to an increase in the percentage of the Co₅Zr magnetic phase as well as Hc (to about 4.6?kOe in the Co₇₈Zr₁₇B₂Si₁Cr₂ sample). In contrast, the precipitation of Co₁₁Zr₂ and Co₂₃Zr₆ compounds during the annealing process over 500?°C had destructive effects on the hard magnetic properties of the studied samples.