Peculiarities of the Synthesis of Ternary Fe-Al-Sn Intermetallic Compound from Mechanically Alloyed Materials

Abstract

© 2020, The Minerals, Metals & Materials Society and ASM International. A nanostructured Fe65Al30Sn5 alloy has been synthesized by mechanical alloying of elemental Fe, Al, and Sn powders in a planetary ball mill. The structure and phase composition of the as-milled sample and the samples after subsequent heat treatment at 400 °C, 500 °C, and 800 °C were investigated using X-ray diffraction, electron microscopy, 57Fe and 119mSn Mössbauer spectroscopy. We found that the as-milled sample is a nanocrystalline ternary bcc solid solution of the estimated composition Fe62Al32.6Sn5.4. The samples of Fe65Al30Sn5 after annealing are non-uniform materials that mainly comprise the ternary B2 ordered phase Fe65Al30Snx, xSn ≤ 1 at. pct. In addition to the dominant B2 ordered phase, we also identified chemically non-ordered regions, Sn and FeSn, FeSn2.