Soft magnetic properties of Fe-based bulk metallic glass system containing niobium and copper

Abstract

investigated with SEM, XRD technique. BMG rods were then prepared by conventional suction casting through copper mould. The XRD pattern of glassy rods exhibit few crystalline phases in all the alloy samples. The suppression of crystalline peaks to a reasonable extent is evident from respective XRD pattern of amorphous rods. Good extent of GFA was achieved with three alloy samples. However the GFA of Fe_1 sample is better than remaining two, but its saturation magnetisation is very poor. Fe_3 sample give better saturation magnetisation Is and its GFA is moderate. Good GFA of Fe_1 sample correlates with higher squareness ratio of the same. The Percentage relative The alloy ingots with three different nominal compositions were prepared and change of density and squareness ratio have same trend of variations. However these three samples exhibit very low squareness ratio. The magnetic properties of Fe_4 sample were intermediate between Fe_1 and Fe_3 samples. Hysteresis loss is found to be least for Fe_1 sample. Hence low Hysteresis loss and good GFA were correlated during this study. It was also observed that saturation magnetisation is high for the sample containing 3mol% of Nb