Experimental Investigation of Phase Equilibria in Zr-Ni-Pt System

Phase equilibria in Zr-Ni-Pt ternary system have been experimentally determined through diffusion triple and alloy sampling approaches. Based on the results of Electron Probe Microanalysis (EPMA) and x-ray diffraction (XRD), isothermal sections of this system were constructed at 1073 and 1173 K. A new ternary phase denoted as Zr₄(Pt,Ni)₃ was detected with composition ranging from 2.5 to 29.7 at.% Ni and 40.7 to 12.7 at.% Pt at 1073 K while 2.2 to 25.1 at.% Ni and 40.9 to 17.5 at.% Pt at 1173 K, respectively. Three continuous solutions are formed between binary compounds ZrNi and ZrPt, Zr₇Ni₁₀ and Zr₇Pt₁₀, ZrNi₃ and ZrPt₃, and large ternary solubility of Ni in ZrPt₄, and of Pt in Zr₂Ni and ZrNi₅, were observed.