Investigation on the isothermal section of the Gd-Ni-Y ternary system at 773Â K

► The phase relationship of the Gd-Ni-Y ternary system at 773 K is investigated for the first time. ► The isothermal section of the system at 773 K is determined and the isothermal section consists of 4 three-phase regions, 15 two-phase regions and 12 single-phase regions. ► Six pair compounds, i.e., Gd2Ni17 and Y2Ni17, GdNi5 and YNi5, Gd2Ni7 and Y2Ni7, GdNi3 and YNi3, GdNi2 and YNi2, Gd3Ni and Y3Ni and metals Gd and Y form a continuous series of solid solutions, respectively. ► The solid solubilities of Gd in YNi and Y in GdNi at 773 K are determined by experimental method.