MOBNI1: TCS Ni-alloys Mobility Database

MOBNI1 is compatible and primarily recommended for use in combination with the TTNI thermodynamic database.

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

MOBNI1 is a kinetic database containing mobility data for Ni-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 Ni-based alloys (e.g. TTNI), then the MOBNI1 database can be used in order to study several different phenomena of interest to Ni-based superalloys design and manufacturing, such as e.g. microsegregation during solidification, homogenization kinetics, precipitate growth/dissolution kinetics, interdiffusion in Ni-base superalloy coating/substrate compounds, and much more.

Included Elements (22)

Al	B	C	Co	Cr	Cu	Fe	Hf	Mn	Mo
N	Nb	Ni	O	Re	Ru	Si	Ta	Ti	W
V	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

The MOBNI1 database contains assessed impurity diffusion data in FCC_A1 Ni for all included elements. It also includes complete and critical assessments of FCC_A1 for the following binary, ternary systems, and higher order systems.

Binary Systems

Al-B	Al-Cr	Al-Fe	Al-Ni	B-Ni	C-Cr	C-Fe	C-Ni	Co-Fe	Co-Ni
Cr-Fe	Cr-Ni	Fe-Mn	Fe-Ni	Hf-Ni	Mn-Ni	Mo-Ni	Ni-Re	Ni-Ta	Ni-Ti
Ni-W

Ternary Systems

Al-B-Ni

Al-Cr-Ni

C-Cr-Fe

C-Cr-Ni

C-Fe-Ni

Cr-Fe-Ni

Quaternary System

Fe-Cr-Ni-C

There are also parameters added for diffusion in the liquid following a simple estimate that all diffusion coefficients in the liquid are equal to 1·10-9 [m/s2].

Limits

The database is applicable for commercial Ni-based superalloys, but care should always be taken, as these alloys are highly complex alloys that usually are including very 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.