Abstract
Phase relationships in the Fe-Mn-Sn ternary system at 723 K were investigated using equilibrated approach. More than 40 alloys were prepared by arc-melting method and examined by x-ray powder diffraction, scanning electron microscopy and energy dispersive spectroscopic. The existence of five binary compounds FeSn, FeSn2, MnSn2, Mn3Sn2, Mn3Sn and one intermediate solid solution γ(Fe, Mn) have been confirmed in this system. FeSn2 and MnSn2 form continuous solid solution (Fe1−x, Mn x )Sn2 (0 ≤ X ≤ 1) and the lattice parameters of (Fe, Mn)Sn2 reduced linearly with increasing of Fe content. At 723 K, the maximum solid solubilities of Fe in αMn, βMn, Mn3Sn, Mn3Sn2 phases and Mn in FeSn, αFe are about 25, 34.8, 37.3, 46.2 at.% Fe and 26.8, 5.5 at.% Mn respectively. The solid solubilities of γ(Fe, Mn) ranged from 42.1 to 78.1 at.% Fe and the limited solubility of Sn is around 3 at.%. The isothermal section consists of 6 three-phase regions, 13 two-phase regions and 9 single-phase regions. No ternary compound was found at 723 K in this system.
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