Effect of replacing Nb with (Mo and Zr) on glass forming ability, magnetic and mechanical properties of FeCoBSiNb bulk metallic glass

In this work, effects of replacing Nb with either Mo or Zr on glass forming ability (GFA), thermal stability, magnetic and mechanical properties of [(Fe0.5Co0.5)0.75B0.2Si0.05]96Nb4 bulk metallic glass were studied. The rod and ribbon samples were prepared using copper mold casting and melt spinner respectively. The replacement of Mo instead of Nb does not affect the crystallization behavior but the GFA is decreased. However an increases in plasticity up to 4% and saturation magnetization (Ms) by 10% is observed for the equal atomic percentage of Mo, with further increase in the Mo content GFA still decreases (dc = 1 mm) and Ms remains the same. In case of [(Fe0.5Co0.5)0.75B0.2Si0.05]96 Zr4 three distinct crystallization events were observed, the glass transition (Tg) and on set of crystallization (Tx) were decreased by 18 K and 23 K respectively. The GFA decreased drastically however the Ms remains the same.