MOBAL1: TCS Al-alloys Mobility Database

MOBAL1 is primarily intended for use in combination with the TTAL8 thermodynamic database, but is also compatible for use in combination with the SSOL or COST thermodynamic databases.

Database name (acronym):	TCS Al-alloys Mobility Database (MOBAL)
Database owner:	Thermo‑Calc Software AB
Database version:	1.0

MOBAL1 is a kinetic database containing mobility data for Al-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.

Applications

Used together with the Add-on Modules and a thermodynamic database for Al-alloys (e.g. TTAL) the MOBAL1 database can be used in order to study several different phenomena of interest to aluminum alloys, such as e.g. microsegregation during solidification, homogenization kinetics, growth/dissolution kinetics of precipitates, interdiffusion in Al-compounds, and much more.

Included Elements (41)

Ag	Al	Au	B	Be	C	Ca	Cd	Ce	Co
Cr	Cs	Cu	Fe	Ga	Ge	H	In	La	Li
Mg	Mn	Mo	Na	Nb	Nd	Ni	Pb	Pd	Pr
Sb	Sc	Si	Sm	Sn	Sr	Ti	Tl	V	Zn
Zr

Included Phases

• FCC_A1
• 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

This database contains assessed impurity diffusion data in FCC_Al for all included elements. However, data for B, C, Ca, Sc, Sr and Zr have been estimated due to lack of reliable experimental information. In addition, a binary assessment for Al-Si (FCC) is included.

There is also assessed data for diffusion in liquid Al for Al, Co, Cr, Cu, Fe, Ga, Ge, Mg, Mn, Ni, Si, Ti, V, and Zn. For remaining elements we use a simple estimate, i.e. D = 1E-7 • exp^(-30000/RT).

Limits

The database is applicable for most commercial Al-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.