UTILITIES_HOMOGENIZATION

ADVANCED_HOMOGENIZATION_OPTIONS

Use this with the HOMOGENIZATION_MODEL for the available utilities.

Syntax

utilities_homogenization

Prompts

Set temperature according to solidus temperature /N/:

Set the global temperature such that it goes to a certain value T_{target}=T_{sol}-X, where X is an entered value. Also enter the rate by which the temperature approaches T_{target}. The solidus temperature is determined with a +/- 1 K accuracy.

Input guesses of the minimum and maximum temperature to occur during the simulation. This utility can be useful to optimize homogenization heat treatments.

The liquid phase must be entered into the system.

 

Dump results to text files /N/:

Enter Y to save simulation results to various text files. The names of these files are fixed and are saved to the current working directory.
 

Read initial composition from text file /N/:

Enter Y to read initial composition from a text file XF.TXT that must be present in the working directory. The file should contain the mole fractions of all elements, in alphabetical order, starting from the first grid point, in the first region, in the first cell.
 

Enter ghost phase /N/:

Enter Y to force the so-called ghost phase to be created. This phase has full solubility of all components and zero diffusivity. The Gibbs energy surface of the ghost phase is set above all other phases. The name of this phase is ZZDICTRA_GHOST. It can be used for numerical reasons. It is created automatically if there is a phase that lack solubility range of one or more components and then used internally by the program.
 

Enter inactive phases into one region /N/:

Enter Y to make all inactive phases at a given interface to be entered into a single multiphase region when any one of the phases becomes stable.
 

Explicitly set substitutional/interstitial /N/:

Enter Y to explicitly select for each element whether it should be substitutional or interstitial. There must be at least one substitutional element in each region. These settings only have effect for the homogenization model and results viewed in the post processor must be interpreted with care; use DUMP RESULTS TO TEXT FILES to get results corresponding to the settings entered here.
 

Save average finite volume composition /N/:

Save the average finite volume composition instead of a converted piece-wise linear composition.
 

Set constant phase addition /N/:

Add constant Gibbs energy contributions to phases (in J/mol formula unit).
 

Use element mobility prefactor /N/:

Enter constant factors which the mobilities of elements are multiplied with in all phases.
 

Enter element mobility constant value /N/:

Interactively enter a constant mobility estimate for specific elements in specific phases. This can be used to enter mobility estimates in phases for which there is no assessed data. Estimates entered here override database values.
 

Enter minimum save interval /Y/:

Enter a minimum time interval (in seconds) that must pass between subsequent saved time-steps. This is useful in cases where a large number of small time-steps may occur in order to keep down the size of the result file.
 

Simplified evaluation of activity boundary condition /N/:

Enter Y to evaluate the fluxes on boundaries directly from the activity gradient, i.e. without taking into account the change of state on the boundary caused by the prescribed boundary activities.

 

Enter explicit limits on composition /N/:

Use this setting with caution to explicitly enter upper and lower limits on composition for all components (in mole fraction).

 

Enter chemical potential contribution /N/:

Enter a function (in valid POLY-3 syntax) that is evaluated separately at all grid points and added to the chemical potential of all elements. The contribution affects the flux between grid points.
 

Do not balance external boundary fluxes /N/:

For all boundary conditions except type GAS, the flux of substitutional elements into the domain is balanced with the flux of the dependent substitutional elements such that the size of the domain is preserved. Enabling this setting disables the balancing of the substitutional fluxes.

This feature is now available under the ADVANCED_HOMOGENIZATION_OPTIONS command. The use of this feature under the command Utilities homogenization is deprecated.

 

Fix external boundary flux of dependent component /N/:

This feature is disabled. A more general version is available under the ADVANCED_HOMOGENIZATION_OPTIONS command. It is still visible for backwards compatibility reasons.

 

Modified kinetics on boundary /N/:

Use this to modify the kinetics on the boundary and enter a factor. If the factor is greater/smaller than one, the mobilities of all elements on the boundary is set equal to the maximum/minimum mobility of all elements times the factor. This can be useful in order to quickly saturate an outermost finite volume.