Continuous Stress Annealing Enables Ultralow-Loss Fe-Based Amorphous Alloys With Superior Magnetic Softness for Industrial Manufacturing AITranslate

Basic Information:

DOI：

Chinese Library Classification Number:

Citation Information:

Fe-based amorphous alloys are attractive soft magnetic materials for next-generation power electronics, yet simultaneously achieving high saturation magnetic flux density (Bs), low coercivity (Hc), and low core loss under scalable processing conditions remains challenging. Here, a composition–stress coupling strategy combining moderate Co substitution with optimized continuous stress annealing (CSA) is proposed to enhance magnetic performance and manufacturability. The optimized Fe81.5−xCoxSi3.7B14.5C0.3 (x = 1) alloy is designed and exhibits outstanding properties, including low Hc of 0.92 A m−1, high Bs of 1.65 T, ultralow core loss (P10/50) of 0.031 W kg−1 at 1.0 T and 50 Hz, and an effective permeability (μe) of 12,200 at 1 A m−1 and 1 kHz. Compared with commercial Metglas 2605SA1, Hc and P10/50 are reduced by 46% and 40%, respectively, whereas Bs is enhanced. Multiscale experiments and micromagnetic simulations reveal that optimal Co content and CSA induce medium-range atomic ordering and magnetoelastic coupling, generating robust uniaxial magnetic anisotropy and coherent three-dimensional magnetization. The CSA process offers a controllable, uniform, and energy-efficient route suitable for large-scale industrial production.