Abstract
Phase equilibria in the Ti-Co-Pt ternary system were measured through diffusion triple and alloy sampling. Based on the results from Electron Probe Microanalysis (EPMA) and X-ray diffraction (XRD) techniques, the isothermal sections of the Ti-Co-Pt system were constructed, which consist of 16 and 13 three-phased regions at 973 and 1173K, respectively. A new ternary phase τ was detected, which contains 23.6–29.9at% Pt at 973K and 27.4–40.1at% Pt at 1173K. Furthermore, an invariant reaction between 973 and 1173K was deduced, i.e. τ + Ti4Pt3 ↔ Ti3Pt + TiPt. By the way, the solubilities of Pt mainly substituting for Co in TiCo and TiCo3 respectively increase from 22.4at% and 26.1at% at 973K to 23.8at% and 33.1at% at 1173K.
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