Experimental investigation of phase equilibria in the Co-W-Nb ternary system
- 材料学院－已发表论文 
The phase equilibria in the Co-W-Nb ternary system were experimentally investigated using optical microscopy, electron probe microanalysis and X-ray diffraction on equilibrated alloys. In this study, isothermal sections of the Co-W-Nb ternary system at 1000 degrees C, 1100 degrees C and 1200 degrees C were determined, and no ternary compound was found. Further results show that a Nb-stabilized Co3W phase is stable at 1100 degrees C, but not at 1200 degrees C in the Co-W-Nb system. The alpha Co2Nb and gamma Co2Nb phases were identified to possess large solubility of W in the present study. The newly determined phase equilibria of the Co-W-Nb in the present study will provide useful information for the development of cemented carbides and high-temperature structural materials. (C) 2012 Elsevier Ltd. All rights reserved.