Effect of P on crystallization behavior and soft-magnetic properties of Fe 83.3Si 4Cu 0.7B 12 − x P x nanocrystalline soft-magnetic alloys

Abstract

The P content dependences of the crystallization behavior, thermal stability and soft-magnetic properties of high Fe content Fe 83.3Si 4Cu 0.7B 12 − x P x (x = 0 to 8) nanocrystalline soft-magnetic alloys were investigated. P addition is very effective in widening the optimum annealing temperature range and refining of bcc-Fe grain size in addition to the increasing of nanocrystalline grain density. Uniform nanocrystalline bcc-Fe grains with average size of about 20 nm and number density of 10 23–10 24 /m 3 were prepared at around x = 6–8 for the annealed Fe 83.3Si 4Cu 0.7B 12 − x P x alloys. The coercivity H c markedly decreases with increasing x and exhibits a minimum at around x = 6–8, while the saturation magnetic flux density B s shows a slight decrease. Fe 83.3Si 4Cu 0.7B 6P 6 nanocrystalline alloy exhibits excellent soft-magnetic properties with a high saturation magnetic flux density B s of 1.77 T, low coercivity H c of 4.2 A/m and high effective permeability μ e of 11,600 at 1 kHz.