Abstract
The initial permeability, density and microstructure are compared as a function of the annealing temperature for nanocrystalline Fe 86Zr 7B 6Cu 1 and Fe 73Si 13.5B 9Nb 3.5Cu 1 alloys. In the optimum annealed state where the initial permeability is the maximum, flat disc-shaped bcc-Fe(Zr) grains were observed by transmission electron microscopy in Fe 86Zr 7B 6Cu 1 in contrast to equiaxed bcc-Fe(Si) grains in Fe 73.5Si 13B 9Nb 3Cu 1. X-ray diffraction revealed a preferred orientation of the bcc grains and large internal stresses in the nanocrystalline Fe 86Zr 7B 6Cu 1 alloy. All these observations may partly contribute to the fact that in the optimum annealed state, the initial permeability is much higher for Fe 73.5Si 13.5B 9Nb 3Cu 1 than for Fe 86Zr 7B 6Cu 1.
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