Effect of Mo substitution for Nb on the glass-forming ability, magnetic properties, and electrical resistivity in Fe80(Nb1–xMox)5B15 (x=0–0.75) amorphous ribbons

Abstract

In this work, Fe80(Nb1–xMox)5B15 (x = 0, 0.15, 0.30, 0.45, 0.60, and 0.75) amorphous ribbons have been fabricated by the melt-spinning method. The effects of the substitution of Nb by Mo on the glass-forming ability (GFA), magnetic properties, and electrical resistivity in the Fe80(Nb1–xMox)5B15 alloys were investigated by X-ray diffraction (XRD), differential scanning calorimetry (DSC), a vibrating sample magnetometer (VSM), and a four-point probe tester. The partial replacement of Nb by Mo decreases thermal stability and enhances the GFA of Fe-Nb-Mo-B alloys. With the increase of Mo content, the GFA of the Fe-Nb-Mo-B alloys is obviously enhanced, while their thermal stability first increases and then decreases. The addition of Mo significantly alters the crystallization process of the Fe-Nb-Mo-B alloys from a single exothermic peak to a complex multi-peak. VSM results indicate that Mo addition increases the saturation magnetization without a significant increase of coercivity. The electrical resistivity increases steadily from 116 μΩ cm for alloys with x = 0 to 150 μΩ cm for alloys with x = 0.75. The Fe80(Nb1–xMox)5B15 alloys exhibit excellent soft magnetic properties, large GFA values, and high electrical resistivity, and are promising new ferromagnetic alloys for use in electronic industries.