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 alpha-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 alpha-Fe crystallization layers exhibits an excellent comprehensive performance of soft magnetic properties (SMPs) with high B-s of 1.67 T, low H-c of 1.6 A/m, and high mu(i) of 9.3 x 10(3) 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.

Automated summary

By adjusting the composition and quenching conditions, a novel amorphous structure with ultra-fine nano alpha-Fe grains in the surface crystallization layer was successfully fabricated. The surface crystallization layer significantly impacts the soft magnetic properties of the FeMnCuMoCPSiB amorphous alloy, showing excellent performance with high B-s, low H-c, and high mu(i). The presence of nanoscale surface precipitation in the alloy enhances its soft magnetic properties, outperforming widely used commercial soft magnetic materials like METGLAS 2605 and showing potential for engineering applications.