Improving the Bs and soft magnetic properties of Fe-based amorphous ribbons by manipulating the surface crystallization behavior

A novel amorphous structure coupling with ultra-fine nano α-Fe grains in the surface crystallization layer was fabricated successfully through composition regulation and proper quenching conditions. The microstructure of the newly formed surface crystallization layer and its effects on soft magnetic properties of FeMnCuMoCPSiB amorphous alloy were investigated systematically. The FeMnCuMoCPSiB amorphous alloy with surface α-Fe crystallization layers exhibits an excellent comprehensive performance of soft magnetic properties (SMPs) with high Bs of 1.67 T, low Hc of 1.6 A/m, and high μi of 9.3 × 103 at 1 kHz. The SMPs of the amorphous alloy is considerably superior to that of widely used commercial soft magnetic materials METGLAS 2605, promising a potential engineering application. It is noteworthy that a nanoscale surface precipitation was found in the alloy, which favors SMPs of the alloy.