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

“…Thus, tin might be molten when trapped with Co and Fe particles. This is in fact the case when p-Cr 90 Sn 10 mixtures are ball-milled in a Spex 8000 with WC milling tools[20]. Indeed, micrographs show undoubtedly that the lamellar structures, which are observed to form initially when ball-milling ductile materials, are created from chromium and from molten tin (figure 4, top right).…”

“…left part: SEM micrographs of p-Fe 44 Co 44 Sn 12 milled for 0h30: overall view (top) and an enlarged view of the circled particle; Co, Fe, Sn, Co+Fe+Sn X-ray maps of the previous particle; right part: SEM micrographs of p-Cr 90 Sn 10 milled for 0.5h(top) and for 4h (bottom)[20].The first stage, for 0.5 ≤ t m ≤ 2h, is characterized by the formation of two stannides, first CoSn 5 and then FeSn 2 , respectively at Co-Sn and Fe-Sn interfaces. The most intense lines at t m =0.5 h, ('1' inFig.…”