Novel Fe-C-B-P-Cu nanocrystalline alloys with superb magnetic properties and processability

In this article, we present a new kind of Fe-C-B-P-Cu nanocrystalline alloys containing high P content with excellent comprehensive magnetic properties and processability. This kind of nanocrystalline alloys exhibits the high saturation magnetic flux density (B-s), low coercivity (H-c) and high effective permeability (mu(e)) in the range of 1.73-1.84 T, 3.2-8.4 A/m and 6000-13000, respectively. It was found that increase of P content remarkably decreases the sensitivity of H-c to annealing temperature (T-a) and widen the optimum annealing temperature range to obtain a low Hc. With the increase of P content, the growth of alpha-Fe grains is retarded, but the nucleation of alpha-Fe grains is increased, resulting in reduced grain size and the intergranular amorphous layer, and precipitated high density of alpha-Fe nanocrystals. Based on the crystallization and structural features, the relationship between soft magnetic properties and microstructure for this kind nanocrystalline alloy was discussed in detail.

Automated summary

This article presents a new type of Fe-C-B-P-Cu nanocrystalline alloy with high P content, showing excellent magnetic properties and processability. Increasing the phosphorus content can effectively lower the coercivity, resulting in better soft magnetic properties. The relationship between microstructure and soft magnetic properties of this alloy is discussed in detail based on crystallization and structural features.