Mechanosynthesis of supersaturated solid solutions of Sn in near-equiatomic bcc FeCo

► (Fe50−x/2Co50−x/2)Snx mixtures are mechanically alloyed for x≤33at.%. ► As-ground powders are studied by X-ray diffraction and 57Fe and 119Sn Mössbauer spectroscopy. ► Supersaturated solutions of Sn in disordered bcc FeCo alloys are formed in our dynamical conditions up to x≤20at.%. ► This maximum Sn solubility found is much larger than the equilibrium solubility which is about 0.5at.%. ► The mean 119Sn hyperfine field in the bcc alloys is essentially constant with x and equal to 9.6T at room temperature. The mechanosynthesis of Fe–Co–Sn ternary alloys from initial powder mixtures of composition (Fe50−x/2Co50−x/2)Snx is studied for x≤33at.%. Disordered nanocrystalline bcc solid solutions are formed in that way up to Sn contents as large as ∼20at.%. The dissolution of Sn in near-equiatomic bcc Fe–Co is unambiguously proven by X-ray diffraction and 57Fe and 119Sn Mössbauer spectroscopy.