J. Phys. IV France
Volume 08, Numéro PR2, June 1998
Soft Magnetic Materials 13
Page(s) Pr2-43 - Pr2-46
Soft Magnetic Materials 13

J. Phys. IV France 08 (1998) Pr2-43-Pr2-46

DOI: 10.1051/jp4:1998209

Nanocrystallization by nitriding treatment of FeSiB-based amorphous ribbons

S. Grognet, H. Atmani and J. Teillet

Magnétisme et Applications, Groupe de Métallurgie Physique, UMR 6634 du CNRS, 76821 Mont-Saint-Aignan, France

In FeSiB-based systems, nanocrystalline state needed for good soft magnetic properties is obtained by controlling nucleation and growth rates of crystallization. These rates are known to depend on the additive elements in the FeSiB alloys but also on the annealing treatment. Generally, Cu and Nb are chosen as additive elements and conventional thermal treatment (C.T.T.) is used to produce the nanocrystalline phase. In this work, we studied Fe73.5Cu1Si13.5B12, Fe74Nb3Si14B9 and Fe73.5Cu1Nb3Si13.5B9 ribbons. To obtain the nanocrystalline state, in addition to C.T.T., we used a nitriding thermochemical treatment (N.T.T.) at =520°C and we show that this treatment improves the nanocrystalline state (smaller grain size D and higher crystalline volume fraction. This treatment also increases the Curie temperature of the crystalline α-FeSi phase.

© EDP Sciences 1998