Abstract
Melt-spun FeCuNbSiB ribbons were annealed at 540–550 °C for various times (≤1 h). The development of a nanocrystalline structure was investigated by means of Mössbauer spectroscopy. From measured hyperfine fields and intensities the crystalline phase was inferred to be pure Fe1−xSix, with x=0.18 after 1 h annealing. The residual amorphous volume fraction was determined to be ≂50%. With help of these results it has been possible to evaluate the amorphous contribution to magnetostriction in the nanocrystalline state. The development of a nanocrystalline structure was found to play a role in the main mechanisms of magnetic disaccommodation.
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