A structural investigation of SmCo5/Fe nanostructured alloys obtained by high-energy ball milling and subsequent annealing

Jean Marie Le Breton (1) , Rodrigue Lardé (1) , H. Chiron (1, 2) , V. Pop (3) , Dominique Givord (4) , Olivier Isnard (5) , I. Chicinas (6)

1 GPM - Groupe de physique des matériaux
2 SIMaP - Science et Ingénierie des Matériaux et Procédés
3 Faculty of Physics
4 NEEL - MNM - Micro et NanoMagnétisme
5 NEEL - MRS - Matériaux, Rayonnements, Structure
6 UTCN - Universitatea Tehnica din Cluj-Napoca

SmCo 5 /Fe nanostructured alloys with 20 wt% Fe, obtained by high energy ball milling of SmCo 5 and Fe powders, were investigated by 57 Fe Mössbauer spectrometry, X-ray diffraction and tomographic atom probe. The Mössbauer analysis reveals that during the first stages of milling, an interdiffusion of Co and Fe occurs, leading both to the formation of α-Fe(Co) regions in α-Fe and to the introduction of Fe in SmCo 5 regions. Annealing at temperatures up to 650°C for 0.5h promotes interdiffusion further leading to the formation of an unique α-Fe(Co) phase and a Fe-richer Sm(Co, Fe) 5 phase. The Co/Fe interdiffusion is confirmed by tomographic atom probe analysis. The data are discussed and compared to the results of previous magnetic measurements.

Mots clés: Physical Sciences

Domaines: Physique Générale [physics.gen-ph]

Jean Marie Le Breton, Rodrigue Lardé, H. Chiron, V. Pop, Dominique Givord, et al.. A structural investigation of SmCo5/Fe nanostructured alloys obtained by high-energy ball milling and subsequent annealing. Journal of Physics D: Applied Physics, 2010, 43 (8), pp.5001. ⟨10.1088/0022-3727/43/8/085001⟩. ⟨hal-00569765⟩