Dear Mehnoush,
In MICRESS, there is no default model for interface mobility. That means that the user can (and has to) decide what is the physics behind the system he or she is simulating and which interface mobility he or she wants to apply. While solidification is relatively simple, the complexity of the physics of solid-solid phase transformation leads to very different strategies the user may follow:
- assume the interface mobility to be a physical interface property and chose it according to literature or by fitting to experiments
- take it as substitute for not included physical phenomena like mechanical stress or redistribution kinetics (nple/para) and calibrate by fitting to experiments
- assume it to be diffusion limited and calibrate with high resolution simulations (
see here).
- assume it to be diffusion limited and use automatic mobility correction for finite interface thickness (mob_corr). Please note that this function is still under test (ask for latest version)
All the above strategies make sense under certain circumstances, and depending on how much physics you include in the simulation: Do you include
- substitutional elements
- redistribution kinetics of substitutional elements (nple, para),
- stress?
Unfortunately, this decision is not easy and depend on the goals which you follow with your simulations...
Bernd