Abstract
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.
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