Excellent Soft Magnetic Properties of Iron-Cobalt-Silicon-Boron-Phosphorus-Carbon-Copper Nanocrystalline Alloys with Ultrafine Nanostructures Based on in-Situ Induction Heating

Alleviating the long-standing trade-off between soft magnetic properties and mechanical toughness in Iron (Fe)-based nanocrystalline alloys, we propose a novel grain refinement pathway via rapid induction annealing.Conventional processing methods often compromise structural reliability while optimizing soft magnetic properties, limiting their broader application.By precisely controlling the rapid induction annealing process, the precipitation of uniform α-Fe nanocrystals with an average size of approximately 10 nanometers within the Fe-based alloy matrix.This unique nanostructure not only significantly reduces coercivity (Hc ~ 4.0 A/m) and enhances initial permeability (1.72 × 10 4 @ 1 kHz), but also improves tensile deformability, thereby overcoming the conventional performance trade-off.Microstructural analysis reveals that the ultrafine nanocrystals induce notable refinement and homogenization of the magnetic domain structure, simultaneously optimizing magnetization reversal behavior and mechanical response.This provides a novel material processing strategy and theoretical foundation for designing next-generation nanocrystalline alloys that combine superior soft magnetic properties with reliable mechanical performance.