Phase equilibria in Fe–Sn–Ti ternary system at 1073K and 1273K

Abstract Phase equilibria in the Fe–Sn–Ti ternary system at 1073 and 1273 K were experimentally investigated through alloy sampling approach facilitated with electron probe micro-analyzer and X-ray diffraction. Two ternary compounds TiFe 2 Sn and Ti 2 FeSn were detected. Ten 3-phase equilibria at 1073 K, including β(Ti)+Ti 3 Sn+FeTi, Ti 3 Sn+FeTi+Ti 5 Sn 3 , FeTi+Ti 5 Sn 3 +Ti 2 FeSn, Ti 2 FeSn+Fe 2 Ti+TiFe 2 Sn, Ti 2 FeSn+Ti 5 Sn 3 +Ti 6 Sn 5 , FeTi+Fe 2 Ti+Ti 2 FeSn, Ti 2 FeSn+Ti 6 Sn 5 +TiFe 2 Sn, TiFe 2 Sn+Ti 6 Sn 5 +Liquid, TiFe 2 Sn+Fe 5 Sn 3 +Liquid and α(Fe)+Fe 2 Ti+TiFe 2 Sn, and seven 3-phase equilibria including β(Ti)+Ti 3 Sn+FeTi, Ti 3 Sn+FeTi+Ti 5 Sn 3 , Ti 3 Sn+Ti 2 Sn+Ti 5 Sn 3 , FeTi+Fe 2 Ti+Ti 5 Sn 3 , Fe 2 Ti+Ti 2 FeSn+Ti 5 Sn 3 , Ti 2 FeSn+Fe 2 Ti+TiFe 2 Sn and Ti 2 FeSn+Ti 6 Sn 5 +TiFe 2 Sn at 1273 K were experimentally confirmed. At 1073 K, the homogeneity ranges of Ti 2 FeSn were 45.5–51.4 at% Ti and 24–27.7 at.% Sn while TiFe 2 Sn exhibited a large homogeneity range of 46.9–66.4 at% Fe and 22.7–26.4 at% Sn, the solubility of Sn in Fe 2 Ti,Fe in Ti 5 Sn 3 , Ti in Fe 5 Sn 3 and Fe in Ti 6 Sn 5 can be up to 4.6 at.%, 10.2 at%, 3.7 at% and 21 at%, respectively, while at 1273 K, Solubility of Sn in Fe 2 Ti considerably increased to 10.8 at%, Fe in Ti 5 Sn 3 changes little. According to the measured phase relations, an invariant reaction was further deduced, which was Fe 2 Ti+Ti 5 Sn 3 ↔FeTi+Ti 2 FeSn occurring between 1073 K and 1123 K.