Mechanosynthesis of bcc alloys from Fe50−y/2Co50−y/2Sn y mixtures (2 ≤ y ≤ 33) and B2 ordering by annealing at modest temperatures - Université de Rennes Accéder directement au contenu
Article Dans Une Revue Hyperfine Interactions Année : 2017

Mechanosynthesis of bcc alloys from Fe50−y/2Co50−y/2Sn y mixtures (2 ≤ y ≤ 33) and B2 ordering by annealing at modest temperatures

Résumé

Elemental powder mixtures of Fe, Co and Sn of initial compositions Fe 50-y/2 Co 50-y/2 Sn y (2≤y≤26) are ball-milled at high-energy. They yield metastable alloys which are predominantly composed of a supersaturated bcc Fe-Co-Sn phase. The amount of tin dissolved in it is at least ~15 at.% in the dynamical conditions of milling which were selected. A recently discovered stannide, CoSn 5 , passed hitherto unobserved in Co–Sn binary phase diagrams. It forms at Co-Sn interfaces at very short milling times, 0.5h, thanks to the high-diffusivity of cobalt in tin. Finally, neutron diffraction and 119 Sn Mössbauer spectroscopy show that metastable B2 ordering develops in as-milled alloys, for y ≤ 26, when they are further annealed at modest temperature, here for 15h at 675K. The tendency to long-range order in ternary Fe-Co-Sn bcc alloys is thus observed in metastable alloys.
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Dates et versions

hal-01620466 , version 1 (20-10-2017)

Identifiants

Citer

B. F. O. Costa, B. Malaman, Gérard Le Caër, P. M. M Gordo, A. Ramalho. Mechanosynthesis of bcc alloys from Fe50−y/2Co50−y/2Sn y mixtures (2 ≤ y ≤ 33) and B2 ordering by annealing at modest temperatures. Hyperfine Interactions, 2017, 238 (1), article no 76 (13 p.). ⟨10.1007/s10751-017-1453-3⟩. ⟨hal-01620466⟩
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