The role of Cu content on structure and magnetic properties of Fe–Si–B–P–Cu nanocrystalline alloys
2019
Jia, Xingjie | Li, Yanhui | Wu, Licheng | Zhang, Yan | Xie, Lei | Zhang, Wei
The increase in Cu content from 1.0 to 1.7 at.% changes the as-spun Fe₈₆₋ₓSi₂B₈P₄Cuₓ and Fe₈₄₋yMn₂Si₂B₈P₄Cuy alloys from a single amorphous phase to a composite of α-Fe nanoparticles dispersing in amorphous matrix and significantly refines the nanostructure and improves the magnetic softness of the annealed alloys. The as-spun Fe₈₂.₃Mn₂Si₂B₈P₄Cu₁.₇ amorphous alloy containing high number density α-Fe nanoparticles forms uniform nanostructure with fine α-Fe grains in an average size of 17 nm after annealing and exhibits low coercivity of 8.4 A m⁻¹ and high effective permeability of 15000 at 1 kHz, which are superior to those of 38 nm, 85.4 A m⁻¹ and 1400, respectively, for the Fe₈₃Mn₂Si₂B₈P₄Cu₁ amorphous alloy. The mechanism relating to the effect of Cu content on the grain refinement was discussed in terms of the as-spun structure and crystallization process of the alloys.
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