Abstract
On the basis of the Ag–Pd–Gd, Ag–Ru–Gd and Pd–Ru–Gd ternary systems, the partial phase diagram of Pd–Ag–Ru–Gd (Gd < 25 at.%) quaternary system has been studied by means of X-ray diffraction analysis, differential thermal analysis, electron probe microanalysis and optical microscopy. The 700 °C isothermal sections of the Ag–Pd–5Ru–Gd, Ag–Pd–20Ru–Gd and Ag–Pd–50Ru–Gd (Gd ≤ 25 at.%) phase diagrams were determined, respectively. And the 700 °C isothermal section of the Pd–Ag–Ru–Gd (Gd ≤ 25 at.%) quaternary system phase diagram was finally inferred. The section consists of four single-phase regions: solid solution Pd(Ag), (Ru), Pd 3Gd and Ag 51Gd 14; five two-phase regions: Pd(Ag) + (Ru), Pd(Ag) + Ag 51Gd 14, (Ru) + Ag 51Gd 14, Pd(Ag) + Pd 3Gd and (Ru) + Pd 3Gd; three three-phase regions: Pd(Ag) + Pd 3Gd + (Ru), Pd(Ag) + Ag 51Gd 14 + (Ru) and (Ru) + Ag 51Gd 14 + Pd 3Gd; one four-phase region Pd(Ag) + (Ru) + Ag 51Gd 14 + Pd 3Gd. No new quaternary intermetallic phase has been found.
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