Measurement of the phase equilibria in the Al–Zr–Y system at 673 and 823 K

Abstract Phase equilibria of the Al–Zr–Y ternary system at 673 and 823 K were investigated by using 14 equilibrated alloys, and the two isothermal sections were then established. The phase relations were almost the same at both isothermal sections. There were fourteen ternary-phase regions. Meanwhile, the solubilities of the third element in the binary compounds at both temperatures were discussed. The solid solubilities of Y in all observed Al–Zr binary compounds (i.e., Al3Zr, Al2Zr, Al3Zr2, AlZr, Al3Zr4, Al2Zr3, AlZr2 and AlZr3) were measured, and the solubilities of Y in Al3Zr4 phase reached to 11.9 at% at 823 K. In addition, there were solubilities of Zr in all observed Al–Y binary compounds (i.e., α-Al3Y, Al2Y, AlY, AlY2 and Al2Y3), and the solubility of Zr in AlY2 phase could reach to 13.3 at% at 673 K. The phase equilibria of the Al–Zr–Y ternary system determined by the present work have provided new phase diagram data for a future thermodynamic assessment of this system.