Phase equilibria were established in the Y–Fe–Al ternary system within the concentration region 50–100 at.% Al for an isothermal section at 1070 K by means of scanning electron microscopy and powder X-ray diffraction. Two ternary aluminides were observed, YFe x Al 12−x (4≤x≤5.6) with the ThMn 12 -type structure, a=8.6467(9)–8.7604(7) Å, c=5.0374(6)–5.0504(5) Å and YFe 2 Al 10 , YbFe 2 Al 10 -type structure, a=8.9649(6) Å, b=10.1568(6) Å, c=9.0113(6) Å. The only binary which forms a prolonged solid solution range is YAl 2 . The unit cell edge of the YFe x Al 2−x compounds, MgCu 2 -type structure, decreases with Fe content from 7.834(9) Å for x=0 down to 7.689(4) Å for x=0.5. 57 Fe Mössbauer spectroscopy data of YFe 2 Al 10 show an unusually large isomer shift for Fe in Al-containing intermetallics and confirm that no magnetic ordering occurs down to 5 K.