Effects of Fe substitution for Co on the thermal, magnetic, and mechanical properties of the Co-Fe-B-Si-Mo alloy system

The effects of Fe content on the thermal, magnetic, and mechanical properties of a Co72B19.2Si4.8Mo4 alloy were studied. Amorphous soft magnetic alloys of (Co1-x Fe (x) )(72) B19.2Si4.8Mo4 (0 1) with 3-mm widths and 27 - 30 mu m thicknesses were obtained by using the melt spinning technique. The crystallization temperature (T (x) ) for each alloy was measured by using differential scanning calorimetry (DSC). All ribbons were identified as fully amorphous by using X-ray diffraction (XRD). The magnetic properties of the amorphous ribbons were measured by using a vibrating sample magnetometer (VSM). The Fe-only ribbon (x = 1) showed the highest saturation magnetization of 1.15 T in these alloys. Also, the nano-hardness (H (nanoindentation) ), and Young's modulus (E) were evaluated by using nano-indentation experiments, and Co21.6Fe50.4B19.2Si4.8Mo4 (x = 0.7) show a nano-hardness (H (nanoindentation) ) of 18.92 GPa.