J. Phys. IV France 08 (1998) Pr2-515-Pr2-518
Effect of internal stresses and dislocation features on the magnetic properties of soft ferromagnetic materialsO. Hubert, E. Hug, I. Guillot and M. Clavel
LG2mS, UPRESA 6066 du CNRS, Université de Technologie de Compiègne, Centre de Recherches de Royallieu, BP. 20529, 60205 Compiègne cedex, France
This paper deals with the evolution of the magnetic anisotropy of non oriented 3%SiFe alloys plastically strained at various plastic strain levels (εp=0.5% / 3.6% / 9.8%). The magnetization characteristics have been investigated for a 50Hz sinusoidal magnetic field and under quasistatic excitation conditions (0.l Hz), along the direction of deformation and in the crossing corresponding direction (i.e. 0° for the 90° strained specimen and so on). Microstructural observations of the dislocation features for each sample are argued in this work. These experiments show that the magnetic properties markedly deteriorate when measurements are carried out in the direction of the applied stress. This phenomenon is less sensitive perpendicular to this applied stress. This plastically induced magnetic anisotropy remains quite constant whatever the plastic strain level. The influence of the kinematic stress level and the distribution of the dislocation features on magnetic properties is discussed.
© EDP Sciences 1998