The effects of minor Cu substitution for Nb in Fe₇₂B₂₀Si₄Nb_4-xCu_x (x = 0.0, 0.1, 0.2, and 0.3) bulk metallic glasses (BMGs) on the magnetic properties were investigated. With increasing Cu content from x = 0 to 0.3, the critical diameters are kept constant at 1.5 mm for all Fe-based BMGs rods. Meanwhile, the increasing saturation magnetization from 1.19 to 1.27 T, and the decreasing coercive force from 2.5 to 1.5 A/m were found, with the effective permeability improved from 20,000 to 24,500. This work reveals the connection between the enhanced magnetic properties and Cu substitution. It may shed light on the design of Fe-based BMGs with better magnetic properties and larger glass-forming ability concurrently.

文章链接：Journal of Non-Crystalline Solids, 2016, 443:108-111. (SCI一区)