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Determination of the CoTi congruent melting point and thermodynamic reassessment of the Co-Ti system

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Abstract

New experimental results and a thermodynamic re-evaluation of the Co-Ti system are presented. Using differential thermal analysis (DTA) and a visual observation-of-melting (VOM) technique, the ≈220 K inconsistency in melting temperature in the literature for the B2 (CoTi) phase is resolved. The congruent melting point is determined to be 1776±5 K. The revised B2 melting temperature, along with other critically reviewed thermochemical and phase-equilibria data from the literature, are used to reassess the thermodynamic description of the Co-Ti system. As a result, a self-consistent set of optimized Gibbs-energy expressions for all CoTi phases is obtained.

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Authors and Affiliations

  1. the National Institute of Science and Technology, 20899, Gaithersburg, MD

    A. V. Davydov (Chemist), U. R. Kattner (Physical Scientist), D. Josell (Metallurgist), R. M. Waterstrat (Metallurgist), W. J. Boettinger (Metallurgist), J. E. Blendell (Ceramist) & A. J. Shapiro (Physicist)

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  1. A. V. Davydov
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  2. U. R. Kattner
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  3. D. Josell
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  7. A. J. Shapiro
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Davydov, A.V., Kattner, U.R., Josell, D. et al. Determination of the CoTi congruent melting point and thermodynamic reassessment of the Co-Ti system. Metall Mater Trans A 32, 2175–2186 (2001). https://doi.org/10.1007/s11661-001-0193-8

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  • DOI: https://doi.org/10.1007/s11661-001-0193-8

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