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

► (Fe50−x/2Co50−x/2)Snx mixtures are mechanically alloyed for x ≤ 33 at.%. ► 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 ≤ 20 at.%. ► This maximum Sn solubility found is much larger than the equilibrium solubility which is about 0.5 at.%. ► The mean 119Sn hyperfine field in the bcc alloys is essentially constant with x and equal to 9.6 T at room temperature.