| Summary: | The phase equilibria of the Co-Ti-Ta ternary system at 1000 °C, 1100 °C, and 1200 °C were experimentally investigated using an electron probe microanalyzer and X-ray diffraction. Experimental results show that: (1) No ternary compound exists in the studied isothermal sections; (2) the β(Ti) and β(Ta) phases form the continuous solid solution β(Ti,Ta) in the Ti-Ta side; (3) the solubility of Ta in the (αCo) is less than 5%; (4) the phases of Co<sub>2</sub>Ti(h) and γ-Co<sub>2</sub>Ta, Co<sub>2</sub>Ti(c) and β-Co<sub>2</sub>Ta form the continuous solid solutions Co<sub>2</sub>(Ta,Ti)(h) and Co<sub>2</sub>(Ta,Ti)(c), respectively.
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