The phase relationships in the Al–Zr–Ho ternary system at 773 K

The phase relationships in the Al–Zr–Ho ternary system at 773 K have been investigated in the whole compositional range. The existences of 13 binary compounds, i.e. Al3Zr, Al2Zr, Al3Zr2, AlZr, Al3Zr4, Al2Zr3, AlZr2, AlZr3, AlHo2, Al2Ho3, AlHo, Al2Ho and Al3Ho have been confirmed. Al17Ho2 was not found at 773 K in this work. In addition, the ternary compound Al15Ho4Zr is confirmed. It has AuCu3 structure and its lattice parameter is a = 0.4201 nm. The results show that the isothermal section consists of 17 single-phase regions, 32 two-phase regions and 16 three-phase regions. The solubility of Zr in Al2Ho, AlHo and Ho is about 71 at.%, 6 at.% and 12 at.% Zr, respectively. No remarkable solid solubility could be found in the other compounds of the Al–Zr–Ho ternary system at 773 K.

Figure optionsDownload as PowerPoint slideResearch highlights▶ The existences of 13 binary compounds have been confirmed. ▶ The ternary compound Al15Ho4Zr is confirmed with lattice parameter refined to be a = 0.4201 nm. ▶ The solubility of Zr in Al2Ho, AlHo and Ho were about 71 at.%, 6 at.% and 12 at.% Zr.