MICRESS Forum

Hi Bernd,

Small question. In experiments, the eutectic (in the intercellular area) γ' has a size around 50nm. But in PF simulations the size I get is more than 100nm. IS this related to precipitation and growth of γ' phase in simulation much earlier than in experiments?

Hi Bernd,

Yes simulation is 2D isothermal simulation. Then probably this level of undercooling is OK.

I have tried with small critical radius. Then the nucleation would start to grow in an undercooling > 15 K. Deviating this amount from equilibrium is OK?

I checked in .TabLin. I only see negative dG values. Strange thing, before disappearing, I see a message in .scr file that grain reached full size. after that message then it shows "phase 1 disappeared".

Initial equlibrium is checked at 1653K. But I simulation I start at a temperature of 1651K

Hi Bernd, Thaks for the explanation. reason for asking this is that as you already know, i have grid spacing of 5nm and S/L intefacial energy of 2.8E-05. When I defined initial radius of 1nm and a critical radius of 1µm, the grain is disappearing very quickly,as soon as the simulation stats. then I ...

Hi Bernd,

is it okay to define a larger radius for the grain size than the grid spacing in analytical_curvature model?

Defining mobility as you suggested seems to solve the problem.

Thanks end

Hi Bernd,

Solved the problem with errors during the nucleation of MC. However, I get this error message during the nucleation of gamma' phase
is this related to calculating the equilibrium.

I have used "diff_comp_sets 1 2 3.

1 - gamma
2 - MC
3 gamma'

many thanks Bernd.

Hi Chamara, This sounds like if you have fluctuations of the phase-field parameter which create new interface cells/fragments, which always require new thermodynamic data for the 0/1 or other 0/x and 1/x phase interactions. You can check in the .TabTQ (giving the computation time for TQ by phase in...