C.C. Zhao

Experimental investigation of phase equilibria in the Co–Cr–W ternary system

Abstract 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.

Experimental determination of the phase equilibria in the Co-Cr-Ta ternary system

National Natural Science Foundation of China [51031003]; Ministry of Education of China [20120121130004]; National Key Basic Research Program of China (973 Program) [2012CB825700]; China Aviation Industry Group