Mobility Databases

From these databases and use of appropriate software, the mobility of an element in a specific phase can be calculated as a function of temperature and composition. If combined with a compatible thermodynamic database, the various diffusion coefficients can readily be calculated. A mobility database is needed for performing simulations using either DICTRA or TC-PRISMA, but can also be used with any of the Software Development Kits (SDKs).

Mobility databases are developed in a similar fashion as thermodynamic databases, i.e. following the CALPHAD method. The difference being that a mobility database contains optimised parameters that enter a model that describes the logarithm of the atomic mobility, rather than the Gibb's free energy, which is the case for a thermodynamic database. The parameters in a mobility database have been optimised by experts after assessing available experimental information and using an optimisation tool specifically designed for this purpose and which is provided within the DICTRA software. The so-called thermodynamic factors, which are required during the optimisation of mobility parameters from experimental inter- or intrinsic-diffusion data, depend on the selected thermodynamic description. For this reason a mobility database is only fully compatible to a specific thermodynamic description.

At Thermo-Calc Software, we have very long experience in this field, including employees who pioneered this work more than 20 years ago.

If you need assistance in selecting the optimum set of databases, please do not hesitate to contacts us. We will be happy to assist you.

All mobility databases.

MOBFE3 is the specialised steel database. MOBFE3 is intended for use with the TCFE8 database.
MOB2 database is intended for use with TCFE5 and older versions as well as SSOL5 databases and can, to some extent, be used for other alloys as well. 

MOBNI4 is the specialised Nickel-based superalloys database and is intended for use with the TCNI8 database, whereas its previous version, MOBNi1, is compatible with the TTNI8 database.

MOBAL3 is the specialised Aluminium-based database and is intended for use with the TCAL4 database, whereas its previous version, MOBAl1, is compatible with the TTAL8 database.

Copper alloys

MOBCU1 is the specialised Copper-based database and is intended for use with the TCCU1 database.

MOBTI1 is the specialised Titanium-based database and is intended for use with the TTTI3 database.

MOBSI1 is the specialised Silicon-based database and is intended for use with the TCSI1 database.

Magnesium alloys

MOBMG1 is the specialised Magnesium database and is intended for use with the TCMG4 database.