MICRESS Forum

Hi Yaozu, using "maximum number of new nuclei" is dangerous: If MICRESS happen to choose 5 unfavourable places, it will not check again, and you will not get any seed. I generally advise to use "-1" (unrestricted) here to avoid getting erratic results, and to adjust the number of seeds by using shie...

Dear Yaozu, I am a bit astonished about your description, because if your initial temperature is below solidus temperature (and you don't consider release of latent heat), then you would get a massive transformation without any segregation - perhaps you mean below "liqudus" temperature instead? It i...

Hi Shenyz, It is difficult to say what causes the problems without having closer insight into your input file. What I could imagine as reason for the negative Al composition is an insufficient updating rate of the thermodynamic data. This can lead to a too far extrapolation, ending up in the negativ...

Dear g.azizi, In MICRESS it is not possible to couple to concentration and temperature simultaneously. The reason is that the diffusion length for heat and solute are orders of magnitude apart, and solving temperature on the fine grid required for the dendrite with concentration coupling would make ...

Hi Chamara, In heat treatment simulations automatic time stepping sometimes creates very large phase-field time steps, because diffusion is slow. Slow diffusion in turn leads to low values for the diffusion limited interface mobility if "mob_corr" is used. Normally, this is not a problem because the...

Hi Billy, unfortunately, there is still no specific nucleation option in MICRESS which restricts nucleation to certain misorientation values... If you would have said you want to have nucleation only on ferrite-ferrite boundaries with >15° misorientation, this would be what I think is to be expected...

Hi jiwonp, Apart from the "CPU Time" which is the sum over the usage of all CPU's, all other columns show wallclock times (using the Fortran DATE_AND_TIME function). We do not distinguish the individual CPU's here because all parallel regions lie completely inside the individual timing blocks. The r...

Hi Billy, let me answer point by point: 1) I confirm your formulation. For NPLE Mn must also be included, because NPLE implies local equilibrium. 2.) ΔG0 is determined by the parallel tangent construction. Numerically it is calculated in TQ as a dormant equilibrium with one phase with phase fraction...

Hi Billy, Nice to hear that you are about to bring your thesis to a good end. Indeed, when considering multicomponent systems it is very confusing to use this type of diagram, because it is (without further assumptions) only valid for binary systems. I agree that, as you say in (1), ΔG is calculated...

Hi Chamara, There is no way assuring a minimum distance of potential nucleation points - it would also be difficult to implement that, because it would not be compatible to freely choosing a radius-seed-density distribution. However, if you set the proper shield distance and a very long shield time,...