Abstract
The isothermal section of the phase diagram of the ternary system AlSnY (65 at.% Y or less) at room temperature was investigated by X-ray powder diffraction, differential thermal analysis, optical microscopy, electron microscopy, electron spectrum and electron probe microanalysis techniques. The section at room temperature consists of ten single-phase regions, 18 two-phase regions and nine three-phase regions. The single-phase region π (Al3Sn9Y8) in this section at room temperature is a new ternary intermetallic compound. It was found that no single phase Al4Y exists in the binary AlY. The other eight single-phase regions in the section correspond to binary intermetallic compounds in the systems AlSn, AlY and SnY. The range of all homogeneous phase fields of terminal solid solution is too small to be observed at room temperature.
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