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

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 approx =220 K inconsistency in melting temperature in the literature for the B2 (CoTi) phase is resolved. T...

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Bibliographic Details
Published in:Metallurgical and materials transactions. A, Physical metallurgy and materials science Physical metallurgy and materials science, 2001-09, Vol.32 (9), p.2175-2186
Main Authors: DAVYDOV, A. V, KATTNER, U. R, JOSELL, D, BLENDELL, J. E, WATERSTRAT, R. M, SHAPIRO, A. J, BOETTINGER, W. J
Format: Article
Language:English
Subjects:
Applied sciences
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Materials science
Metals. Metallurgy
Phase diagrams and microstructures developed by solidification and solid-solid phase transformations
Phase diagrams of metals and alloys
Physics
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Summary: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 approx =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 plus/minus 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.
ISSN:1073-5623
1543-1940
DOI:10.1007/s11661-001-0193-8