About the TCS Ti/TiAl-based Alloys Database (TCTI)

TCS Ti/TiAl-based Alloys Database (TCTI) is a thermodynamic and properties database for conventional Ti-based and newly emerging γ-TiAl based alloys. All necessary volume data (including molar volume and thermal expansion) for various solution and intermetallic phases is available.

This database can be used to calculate various phase diagrams and thermodynamic properties in assessed systems, but also to predict stable and metastable phase equilibria (β-transus temperature, evolution of phase fractions vs. temperature, martensitic temperature, and so on) for a wide range of multicomponent alloys of industrial relevance, with light impurities (O, N, H, etc.) taken into account. Ti- and γ-TiAl-based alloys of relevance that can be studied include, but are not limited to:

  • Alpha and near-alpha alloys, such as Ti-6242Si
  • Alpha-beta alloys, such as Ti64
  • Beta or near-beta alloys, such as Ti 10-2-3
  • γ-TiAl based alloys, such as TNM alloys

In addition to thermodynamic data, it has thermophysical and elastic properties data available for:

  • Molar volume with thermal expansion coefficients
  • Viscosity of the metallic liquids
  • Surface tension of liquid metallic alloys
  • Electrical resistivity
  • Thermal conductivity
  • Elastic moduli and elastic constants

TCTI6 Thermophysical and Elastic Properties

The database can be used with our entire suite of products: Thermo-Calc, the Add-on Diffusion (DICTRA), Precipitation (TC-PRISMA), and/or Additive Manufacturing Modules, and all available SDKs.

The thermodynamic database is compatible with the corresponding mobility database TCS Ti-alloys Mobility Database (MOBTI) that provides kinetic data for those working with the add-on kinetic modules – the Diffusion Module (DICTRA) and the Precipitation Module (TC-PRISMA) – as well as a few specific calculation types, such as Scheil with back diffusion. The current version of the mobility database is MOBTI5.

TCS Ti/TiAl-based Alloys Database (TCTI) is also integral to the Titanium Model Library, which is a package of property models used to set up calculations in the Property Model Calculator that are common to those working in the titanium industry. The library includes two models intended for those working with titanium: Alloy Strength – Ti and Martensite Temperatures – Ti.

The Titanium Model Library is available for free to all users who have licenses for the titanium databases TCTI (version 6 or newer) and a valid Maintenance & Support Subscription (M&SS).

There are examples available to both demonstrate the validation of the database and to showcase the types of calculations that can be used for different materials or application areas depending on the database.

About the Database Examples

Some use case examples of how the TCTI6 database can be used include:

  • Calculate various phase diagrams and property diagrams in the assessed systems as well as extrapolated higher-order systems.
  • Predict phase formation, phase fractions and phase compositions in multicomponent titanium alloys.
  • Predict solidification behavior of Ti- and TiAl-based alloys with Scheil calculations in Thermo‑Calc.
  • Couple with a compatible atomic mobility database to study diffusion-controlled phase transformations with the add-on Diffusion Module (DICTRA) or multi-particle precipitation kinetics with the Precipitation Module (TC-PRISMA).

Calculations and simulations for higher-order systems might not be valid beyond the Ti-rich region and the Ti-Al vicinity.

It is possible to combine several databases to make calculations using Thermo‑Calc. For more information related to a specific type of problem, contact one of our support specialists at info@thermocalc.com. The experts are available to make recommendations on the most suitable database to use for your needs.

TCTI: TCS Ti/TiAl-based Alloys Database Revision History. The current version of the database is TCTI6. See the link for any subversion release details.