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- Title
SIMPLIFICATION OF THE THERMODYNAMIC DESCRIPTION OF THE Ti-Si SYSTEM.
- Authors
Fiore, Marina; Beneduce, Flávio; de Farias Azevedo, Cesar Roberto
- Abstract
The thermodynamic optimization of ternary or higher order systems containing Ti requires that the Ti-X binary systems are continuously updated. The Ti-Si system has been studied and thermodynamically optimized since de 1950s. The Ti5Si3 phase was initially considered stoichiometric to facilitate the thermodynamic calculations, although experimental results showed that this phase was a non-stoichiometric intermetallic. The most recent optimization of the Ti-Si system described this phase as a non-stoichiometric intermetallic with three sublattices, using the sub-lattice model. The problem of this approach is that it increases considerably the number of variables to be optimized during the calculation of the Ti-Si-X phase diagrams, hindering the convergence of the computational processing. The present work simplifies the optimization of the Ti-Si system, assuming that Ti5Si3 phase is mostly hyper-stoichiometric in relation to Ti. The results showed that this simplification did not significantly affect the phase diagram and the thermodynamic properties calculated for the system.
- Subjects
THERMODYNAMICS; BINARY metallic systems; PHASE diagrams
- Publication
Tecnologia em Metalurgia, Materiais e Mineração, 2016, Vol 13, Issue 1, p91
- ISSN
2176-1515
- Publication type
Article
- DOI
10.4322/2176-1523.1045