Abstract
Phase equilibria in the Ni-Al-Ta system were determined at 1000 and 1250°C. From metallography, X-ray diffraction and electron probe microanalysis (EPMA), two isothermal sections for Ta contents < 50 at. % were set up. The stability ranges of the Laves phase NiAlTa and the Heusler phase Ni 2 AlTa were fixed and that of Ni 6 AlTa is confirmed. Several other ternary intermetallic phases, which had been reported in the literature, are not confirmed. Lattice constants are given for all phases studied. For those phases with a large solid solubility range, i.e. NiTa and NiAlTa, they are given as a function of composition.
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