The phase equilibria in the Co–Cr–W ternary system were experimentally investigated by using optical microscopy, electron probe microanalysis and X-ray diffraction on equilibrated alloys. In this study, isothermal sections of the Co–Cr–W ternary system at 1000°C, 1100°C and 1200°C were determined. The intermetallic compound R phase with its composition region were determined in the isothermal section at 1200°C, whereas it was absent at 1000°C and 1100°C. The Co7W6 phase was found to possess a large solubility of Cr. The trapezoid-shaped composition region of σ phase was determined from 1000°C to 1200°C in the present work. The newly determined phase equilibria of the Co–Cr–W in the present study will provide useful information for Co-based alloys and Co–W base cemented carbides.
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