Effect of Annealing Temperature on Magnetic After-Effect in FeCuNbSiB Alloys
نویسندگان
چکیده
The microstructure and magnetic properties i.e. the initial permeability, magnetic &ereffect and coercivity for the asquenched and annealed at different temperatures s C U I N ~ & ~ 5B9 samples are studied After annealing the samples at 573 K for 1 h the decrease of the initial permeability and increase of the disaccommodation amplitude are o b s e ~ e d These are connected with a local anisotropy induced during this treatment. The increase of the annealing temperature causes the improvement of soft magnetic properties. However, after annealing the toroidal samples at 723 K for 1 h a magnetic hardening is observed It seems to be connected with the appmnce of aFe-Si nuclei and clusters enriched in Cu. Moreover, it was stated that the cooling conditions of the samples influence also their magnetic properties. Therefore, the values of coercivity obtained for annealed strips in comparison with corresponding results of p' obtained for toroids are shifted towards higher temperature by 50 K.
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