Experimental determination of phase equilibria in the Co–V–Mo ternary system

The phase equilibria in the Co–V–Mo ternary system were investigated by means of optical microscopy, electron probe microanalyzer and X-ray diffraction. Four isothermal sections of the Co–V–Mo ternary system at 800, 1000, 1100 and 1200 °C were experimentally established, and no ternary compound was found in this system. Experimental results show that the solubility of Mo in the σ-Co2V3 phase increases with an increase in temperature region from 800 to 1200 °C. The newly determined phase equilibria in this system will provide important information for the development of Co-based alloys.

► Four isothermal sections of the Co–V–Mo system were experimentally determined. ► The solubility of Mo in the σ-Co2V3 phase increases with an increase in temperature region from 800 to 1200 °C. ► A large region of (V, Mo) continuous bcc solid solution was determined.