Enhanced glass-forming ability of FeCoBSiNb bulk glassy alloys prepared using commercial raw materials through the optimization of Nb content

摘要

We optimized the alloy compositions by modifying the Nb content in [(Fe_(0.5)Co_(0.5))_(0.75)B_(0.20)Si_(0.05)]_(100-x)Nb_x(x=3.6-4.4) alloy system. As a result, it was found that the Nb content of 4.3 at. % was effective for approaching alloy to a eutectic point. By copper mold casting, [(Fe_(0.5)Co_(0.5))_(0.75)B_(0.20)Si_(0.05)]_(95.7)Nb_(4.3) bulk glassy alloy rods with diameters up to 4 mm were successfully synthesized even using commercial raw materials. These glassy alloys exhibit a rather high saturation magnetization of 0.77 T and low coercive force of 2.5 A/m.