Experimental investigations of microstructures and phase equilibria in the Co-V-Ta ternary system

J. J. Ruan, C. P. Wang, S. Y. Yang, T. Omori, T. Yang, Y. Kimura, X. J. Liu, R. Kainuma, K. Ishida

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16 Citations (Scopus)


The microstructures and the phase equilibria of the equilibrated Co-V-Ta ternary alloys have been investigated. Moreover, four isothermal sections of the Co-V-Ta ternary system at 1300, 1200, 1100 and 900°C are experimentally established. The corresponding results are summarized as follows: (1) the C14 phase with a large solubility of Co is observed both at 1300 and 1200°C, while it forms a ternary single phase region at 1100 and 900°C; (2) the C36 phase, containing a large solubility of V, is identified at 1300, 1200 and 1100°C, while it exists as a ternary single phase region at 900°C; (3) Co is in favor of stabilizing the C14 phase against lowerature, while V plays an analogous influence on the C36 phase; (4) the solubility of Ta in σ-Co2V3 phase decreases by a small amount as the temperature decreases from 1300 to 900°C. In addition, the experimental information obtained in the present work is not only essential for the thermodynamic assessment of the Co-V-Ta ternary system, but also important for the development of the Co-base alloys.

Original languageEnglish
Pages (from-to)141-148
Number of pages8
JournalJournal of Alloys and Compounds
Publication statusPublished - 2016 Apr 15


  • Higherature alloys
  • Intermetallics
  • Microstructure
  • Phase diagrams
  • X-ray diffraction


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