Improving the amorphous forming ability of FeSiBPCu nanocrystalline alloys by substituting Cu with C

This study aims to improve the amorphous forming ability (AFA) of FeSiBPCu nanocrystalline alloys and simplify their industrial production process. We investigated the AFA and soft magnetic properties of a series of Fe₈₅Si₂B₉P₃Cu_1-xC_x (x = 0, 0.3, 0.5, 0.7 and 1) by substituting for Cu with C. The results show that the substitution method significantly reduces the preparation requirements for producing of amorphous alloys in the quenched state. By selecting an annealing of 480 °C for 330 s, which corresponds to the interval between the first and second crystallization temperatures, we achieved nanocrystalline phases with fine sizes. The annealed Fe₈₅Si₂B₉P₃Cu_1-xC_x alloy exhibits an increase in grain size and coercivity (H_c). Notably, the Fe₈₅Si₂B₉P₃Cu_0.7C_0.3 nanocrystalline ribbons with high saturation magnetization strength (B_s) of 1.8 T and low H_c of 9.8 A/m demonstrate excellent soft magnetic properties and low production process requirements, indicating significant potential applications.