TCTI6 Elements, Systems, and Phases
This section summarizes the available elements, assessed systems, and total number of phases in the TCS Ti/TiAl-based Alloys Database (TCTI).
Included Elements
There are 28 elements included in the most recent version of the database.
| Included Elements | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Ag | Al | B | C | Co | Cr | Cu | Fe | H | Hf |
| Mn | Mo | N | Nb | Ni | O | Pd | Pt | Re | Ru |
| Si | Sn | Ta | Ti | V | W | Y | Zr | ||
Assessed Systems and Phases
The most recent version of the database contains:
- 279 binary systems
- 111 ternary systems
- 423 solution and intermetallic phases. This includes nearly all stable phases in the assessed systems and most important metastable phases that may form in Ti- and TiAl-based alloys.
By default, the GAS phase is restored when retrieving the data from the database; it needs to be manually rejected when it is not required for a calculation.
In Console Mode, you can list phases and constituents in the Database (TDB) module and the Gibbs (GES) module. For some phases, supplementary information is included in the definitions. To show the information, it is recommended in the Database (TDB) module to use the command List_System with the option Constituents.
The ordered B2 phase with BCC_A2 is modeled with the so-called partition model, which describes an ordered phase and its disordered counterpart using a single Gibbs energy function. This type of description is of importance to predict second order transformations between a disordered phase and its ordered structures.
Note about the Ternary Systems
Although the assessed ternary systems in TCTI have been modeled by considering experimental data over quite wide (if not entire) compositions, this database most prominently targets light elements, like O, C, N, H, as impurities in alloys. Therefore, appending another appropriate database, for example the TCS Metal Oxide Solutions Database (TCOX) may be essential for calculations in pseudo-binary systems, as well as systems with a certain large amount of such elements.