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

Abstract

The isothermal section of the phase diagram of the Gd–Ni–Y ternary system at 773 K was investigated by means of X-ray powder diffraction, metallographic analysis and scanning electron microscopy with energy dispersive analysis. The isothermal section consists of 12 single-phase regions, 15 two-phase regions and 4 three-phase regions. Six pairs of corresponding compounds in the Gd–Ni and Y–Ni systems, i.e., Gd 2Ni 17 and Y 2Ni 17, GdNi 5 and YNi 5, Gd 2Ni 7 and Y 2Ni 7, GdNi 3 and YNi 3, GdNi 2 and YNi 2, Gd 3Ni and Y 3Ni and metals Gd and Y form a continuous series of solid solutions, respectively. At 773 K, the maximum solubilities of Gd in YNi and Y in GdNi were about 20 at.% Gd and 8 at.% Y, respectively. No solubility of Gd in YNi 4 and Y in GdNi 4 was observed.