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

• Published in: International journal of materials research Vol. 104; no. 9; pp. 836 - 842
• Main Authors: Zhang, Xinqiao, Yang, Shuiyuan, Zhao, Cancan, Lu, Yong, Liu, Xingjun, Wang, Cuiping
• Format: Journal Article
• Language: English
• Published: Munich De Gruyter 12.09.2013; Hanser
• Subjects: Alloys; Applied sciences; Balancing; Cemented carbides; Cobalt base alloys; Diffraction; Electron microprobe; Exact sciences and technology; Metals. Metallurgy; Microstructure; Phase diagrams; Phase equilibria; Solubility; Ternary alloy systems; Ternary systems; X-rays; Electron microprobe; Phase diagrams; Ternary alloy; Ternary system; Phase diagram; Ternary alloy systems; Microstructure; Phase equilibrium
• ISSN: 1862-5282; 2195-8556
• DOI: 10.3139/146.110935

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 Co 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.