Abstract
Phase relations in the Al-Cr-Er ternary system at 773 K (500 °C) were investigated by means of powder X-ray diffraction, differential scanning calorimetry (DSC), and scanning electron microscope equipped with energy dispersive spectrometer (SEM-EDS). An isothermal section at this temperature was experimentally constructed covering the whole concentration range. Two ternary compounds, namely, Al8Cr4Er and Al43Cr4Er6 were confirmed to exist at this temperature. The results show that there were 15 single-phase regions, 28 two-phase regions, and 14 three-phase regions in the studied isothermal section. The solubility of Er in intermediate phases (i.e., Al7Cr, Al9Cr4, Al8Cr5, and AlCr2) at the Al-Cr side is lower than 1 at. pct, whereas the solubility of Cr in Al-Er binary intermetallic (except the Al3Er phase) is about 1 to 3 at. pct. In addition, combining DSC results with SEM-EDS analysis, it is found that Al17Er2 phase does not exist in the present experimental condition.
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