Phase Equilibria of the Al-Sc-Zr Ternary System at 500 °C

Phase equilibria of the Al-Sc-Zr ternary system at 500 °C have been experimentally investigated by determining twenty-seven equilibrium alloys. X-ray diffraction and electron probe microanalysis were used to identify the phases and their compositions. The isothermal section of the Al-Sc-Zr system at 500 °C was constructed based on the experimental results and the information on the three constituent binary systems. Sixteen two-phase equilibrium regions and ten three-phase equilibrium regions were included and no ternary compounds were observed. The experimental results indicated that all the binary intermetallic compounds exhibited appreciable solubility of the third component. Besides, the continuous solid solution θ (Al(Sc, Zr)2) forms between AlSc2 and AlZr2.