Abstract
Elemental powder mixtures of Fe, Co and Sn of initial compositions Fe50−y/2Co50−y/2Sny(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, CoSn5, 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 119Sn 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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The financial support of the bilateral Portuguese-French program FCT-CNRS is gratefully acknowledged. We thank ILL for the provision of neutron beam time.
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This article is part of the Topical Collection on Proceedings of the International Conference on the Applications of the Mössbauer Effect (ICAME 2017), Saint-Petersburg, Russia, 3-8 September 2017
Edited by Valentin Semenov
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Costa, B.F.O., Malaman, B., Caër, G.L. et al. Mechanosynthesis of bcc alloys from Fe50−y/2Co50−y/2Sn y mixtures (2 ≤ y ≤ 33) and B2 ordering by annealing at modest temperatures. Hyperfine Interact 238, 76 (2017). https://doi.org/10.1007/s10751-017-1453-3
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DOI: https://doi.org/10.1007/s10751-017-1453-3