MOBTI1: TCS Ti-alloys Mobility Database

MOBTI1 is primarily intended for use in combination with the TTTI thermodynamic database, but is also compatible for use in combination with the SSOL thermodynamic databases.

Database name (acronym):

TCS Ti-alloys Mobility Database (MOBTI)

Database owner:

Thermo‑Calc Software AB

Database version:

1.0

MOBTI1 is a kinetic database containing mobility data for Ti-based alloys present in a format suitable for simulation of diffusion controlled phenomena using the add-on Diffusion Module (DICTRA) and/or Precipitation Module (TC-PRISMA), and/or for use together with any Thermo‑Calc programming interface.

Used together with the Add-on Modules and a thermodynamic database for Ti-alloys (e.g. TTTI) the database can be used in order to study several different phenomena of interest to titanium alloys, such as solidification, growth/dissolution kinetics of alpha and minor precipitates, etc.

Included Elements (9)

Al Cr Mo Nb Sn Ta Ti V Zr

Included Phases

  • BCC_A2
  • HCP_A3
  • LIQUID

The phases have diffusion data included in the database. You can include other phases in a diffusion simulation. However, these other phases are treated as so-called diffusion NONE, i.e. there is no diffusion considered in these other phases. Any phase not listed above is automatically entered as diffusion NONE (in Console Mode in the DICTRA module or in Graphical Mode with the Diffusion Module (DICTRA) and/or Precipitation Module (TC-PRISMA)), as long as a thermodynamic description for the phases is retrieved prior to reading data from the mobility database.

Assessed Systems

BCC_A2

The database contains assessed impurity diffusion data in Ti for all included elements. It also includes complete and critical assessments for BCC_A2 in the following binary and ternary systems.

  • Al-Ti
  • Al-V
  • Cr-Ti
  • Cr-V
  • Mo-Ti
  • Nb-Ti
  • Sn-Ti
  • Ta-Ti
  • Ti-V
  • Ti-Zr
  • Ti-Al-V

HCP_A3

The database contains assessed impurity diffusion data in Ti for all included elements. It also includes complete and critical assessments for HCP_A3 in the following binary systems.

  • Al-Ti
  • Al-V
  • Ti-V

LIQUID

Due to lack of consistent data we estimate that most of the elements diffuse like Ti.

Limits

The database is applicable for most commercial Ti-based alloys, care should be taken with alloys including high amounts of alloying elements.

As in the spirit of the CALPHAD method, predictions can be made for multicomponent systems by extrapolation into multicomponent space of data critically evaluated and assessed based on binary, ternary and in some cases higher order systems. However, critical calculations must always be verified by equilibrium experimental data; it is the user's responsibility to verify the calculations but Thermo‑Calc Software AB is interested to know about any significant deviations in order to improve any future release.