Thermal and magnetic characterisation of (Co0.402Fe0.201Ni0.067B0.227Si0.053Nb0.05)100–xCux bulk metallic glasses

In this work, Co-based (Co0.402Fe0.201Ni0.067B0.227Si0.053Nb0.05)(100-x) Cu-x bulk glassy alloys (BMG) with 2 mm diameters were formed by suctioncasting method and effect of Cu in this system's thermal stability, glass forming ability and magnetic properties were also investigated. The curves of thermal analysis, obtained using differential scanning calorimetry, show that (Co0.402Fe0.201Ni0.067 B0.227Si0.053Nb0.05)(100-x) Cu-x (x = 0-2) has supercooled liquid region (Delta T-x) of about 45 K, and reduced glass transition temperature (T-g/T-l) lies in the range from 0.663 to 0.678. The saturation magnetisation (J(s)) and coercivity (H-c) for ascast BMG were in the range of 0.46 T-0.65 T and 13 A/m, respectively