Glass forming ability and magnetic properties of bulk metallic glasses Fe68.7−xC7.0Si3.3B5.5P8.7Cr2.3Mo2.5Al2.0Cox (x=0–10)

Effects of partial substitutions of Co for Fe on the glass forming ability (GFA), mechanical and magnetic properties have been studied aiming at commercial magnetic and structural applications of bulk metallic glasses Fe68.7−xC7.0Si3.3B5.5P8.7Cr2.3Mo2.5Al2.0Cox (x=0–10). Fully amorphous rods of 6 mm in diameter exhibiting fracture stress (σf) approaching 3.4 GPa and plastic strain (εp) of about 0.5% can be prepared through the replacement of 1–2 at% Fe by Co. Enhancement in GFA is attributed to the suppression of primary phase α-Fe with the optimum Co additions. Magnetic properties can be improved by the partial substitution of Co for Fe in the amount of 5 at% leading to the formation of amorphous ribbon with a saturation magnetization value of 0.85 T and a coercive force value of 11.5 A/m.