Abstract
The effects of the addition of Cu on the crystallization processes, nanostructures and soft magnetic properties for the Fe 80.8–84.8B 8–10P 6–8Cu 1.2 alloys were investigated. The Fe–B–P–Cu alloys show two separated distinct exothermic peaks upon heating due to the addition of Cu. Furthermore, the interval temperature between each one for the Fe 82.8B 9P 7Cu 1.2 alloy is 103 K, and the first and second exothermic peaks result from the phase transition from amorphous to α-Fe and then to Fe 3(B,P), respectively. A uniform nanocrystalline structure composed of α-Fe grains with a 17 nm diameter was realized by annealing just above the first exothermic peak, and this nanocrystalline alloy exhibits high B s of 1.70 T and low H c of 4.9 A/m. Therefore, the nanocrystalline Fe–B–P–Cu soft magnetic alloy with high B s and low H c has a large industrial advantage due to miniaturization, high efficiency and low material cost of electric devices.
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