Synthesis and properties of ferromagnetic Fe-based (Fe, Ni, Co)–Mo–P–C–B bulk metallic glasses with large supercooled liquid region

New ferromagnetic Fe-based (Fe, Co, Ni)_67.5Mo_7.5P₁₀C₁₀B₅ bulk metallic glasses have been developed based on an Fe₇₅P₁₀C₁₀B₅ alloy. These alloys exhibit large supercooled liquid region of 97–102 K, low glass transition temperature of 727–738 K, high glass-forming ability (GFA) with critical sample diameters of 3–4 mm, and low viscosity values on the order of 10⁷ Pa s in the supercooled liquid state. The magnetic and mechanical measurements reveal that the alloys also possess good soft magnetic and mechanical properties, i.e., low coercive force of 3.04–4.37 A/m, rather high saturation magnetization of 0.77–0.83 T, high yield strength of 3344–3463 MPa, and large plastic strain of 0.6–1.1%. In addition, the effects of Mo, Co and Ni addition on the stabilization of supercooled liquid and GFA in the Fe–P–C–B alloy system have been discussed.