Abstract
The effect of annealing temperature on the temperature dependence of initial permeability of Fe 73.5Cu 1Nb 3Si 13.5B 9 alloy has been investigated. It was found that for the amorphous alloy consisting of a single phase a sharp Hopkinson peak appears and the Curie temperature value in as-quenched state was detected to be around 318 °C, which can be increased by annealing at T a ≤ 460 °C. During the first stages of the crystallization to a nanophase structure, a smooth peak was observed on the μ i– T curve. However, the nanostructured alloy containing a dual phase, which has excellent soft magnetic properties, showed a long tail character. In addition, at T a = 600 °C two magnetic Curie transitions were found to be around 264 and 584 °C, corresponding to residual amorphous and α-Fe(Si) nanocrystal phase, respectively. According to the change in the microstructure after annealing, the influences of the magnetic characteristic of residual amorphous matrix and the volume fraction of α-Fe(Si) nanocrystalline phase on the magnetic exchange coupling between nanosized grains and the temperature dependence of initial permeability were also discussed.
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