Isothermal sections of the Co-Re-Ta phase diagram at 1200 and 1375 K
Source abstract
Abstract
Abstract Isothermal sections of the Co-Re-Ta system were constructed at 1375 K and 1200 K by investigations of equilibrated alloys using electron probe microanalysis (EPMA), scanning electron microscopy (SEM), powder X-ray diffraction (PXRD) and differential thermal analysis (DTA). In the Co-Re-Ta system at 1375 K, the existence of five three-phase equilibria (γСо+λ+μ), (γСо+μ+(Re)), (μ+χ+(Re)), (βTa+μ+χ) and (βTa+μ+Ta2Co) has been established and the existence of three-phase equilibrium (γСо+λ+λ′) has been assumed. In the Co-Re-Ta system at 1200 K, the existence of six three-phase equilibria (γСо+λ′+Co3Ta), (γСо+λ+μ), (γСо+μ+(Re)), (μ+χ+(Re)), (βTa+μ+χ) and (βTa+μ+Ta2Co) has been established and the existence of two more three-phase equilibria (γСо+λ+λ′) and (λ+λ′+Co3Ta) has been assumed. The Laves phase λ′ is a ternary phase at 1200 K and crystallizes with the MgNi2-type of the crystal structure.
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OpenAlex topics: Metallurgical and Alloy Processes · Intermetallics and Advanced Alloy Properties · Advanced materials and composites
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