Eleventh International Conference on Internal Friction and Ultrasonic Attenuation in Solids
J. Phys. IV France 06 (1996) C8-549-C8-552
Effect of Annealing Temperature on Magnetic After-Effect in FeCuNbSiB AlloysW.H. Ciurzynska1, C. Gomez-Polo2, J. Arcas3, A. Hernando3, J.I. Perez-Landazabal2 and J. Zbroszczyk1
1 Institute of Physics, Technical University of Czestochowa, Armii Krajowej 19, 42-200 Czestochowa, Poland
2 Departamento de Fisica, Universidad Publica de Navarra, Pamplona, Spain
3 Instituto de Magnetismo Aplicado and Instituto de Ciencia de Materiales, Madrid, Spain
The microstructure and magnetic properties i.e. the initial permeability, magnetic after-effect and coercivity for the as-quenched and annealed at different temperatures Fe73.5Cu1Nb3Si13.5B9 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 observed. 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 appearance of αFe-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 µ' obtained for toroids are shifted towards higher temperature by 50 K.
© EDP Sciences 1996