Abstract
The influence of the silicon and boron contents on the structure and magnetic properties of Fe 74.5Cu 1Nb 2Si x B 22.5− x (at%) nanocrystalline alloys, with x = 9.5–17.5; has been investigated. The results show that the lattice constants and Curie temperatures of the nanocrystalline alloys decrease linearly with increasing x. We deduce that the silicon content x α in the grains increases linearly with increasing x, and obtain the relation x α = 0.626 × + 10.5. The λ s values of the alloys decrease with increasing Si content for the nanocrystalline state, but increase for the as-quenched state. For the alloys annealed at a certain temperature, the volume fraction V x of nanoscale grains is related to the Si and B contents of the alloys. V x increases with increasing x (decreasing B content). Within the range of compositions studied, the nanocrystalline alloy has the optimum soft magnetic properties when x = 14.
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