MICRESS Forum

Hi Stéphane, You may perhaps find some answers in my presentation ‘Phase-Field Studies of the Interplay between Nucleation and Growth in Light Metal Alloys’ from March 2019 which you can find in ResearchGate https://www.researchgate.net/publication/332409294_Phase-Field_Studies_of_the_Interplay_betw...

Dear Pina, great to see you working on such interesting simulations! I couldn't run your simulation without the input structure, but I guess the critical point is that you defined austenite with tetragonal symmetry. This means, it can nucleate in two different variants with special orientation relat...

Hi, as far as I understood you would like to evaluate the effective nucleation density from a simulation which has already been run, i.e. as post processing. In fact, there does not yet exist a direct output for the effective nucleation density, but in most cases you can evalutate it indirectly from...

Hi Moritz, I guess the most convenient way would be to combine the output files *.korn and *TabO. 1.) Extract the grain id for each cell within the domain from file.korn. 2.) Get the associated orientation from TabO. 3.) Create the pole figure with MatLab or the same tool you use for experimental da...

Hi, In fact, two different ways of curvature evaluation are inplemented within Micress. A general advantage of the phase-field method is that the kinetic phase-field equation ( derived from the free energy functional) implicitely accounts for capillarity forces and profile readjustment. The numerica...

Hi, To question1: Relaxation approach The MPF order parameters are linked by the unit sum constraint, i.e. each phase can only change its state in interaction with another phase. The given relaxation approach describes the evolution of the multiphase system towards a minimum of the free energy under...

The amount of noise you specified in input file is locally added to the driving force. You can monitor the effect on the driving force in the *.driv output file. The values are given in units of J/cm3, if you devide them by the local entropy of fusion ( dSf ≈ 1 J/(cm3 K) you will get the extra under...

Hi Billy, first I like to comment that the shrinkage of a single round grain is one of the fundamental benchmarks provided in the Micress/example/benchmark folder under the name 'B007_1Grain_Shrinking_dri'. If you do not yet have this folder, you can download it from the Micress webpage https://micr...

Good question! We still have to change it. When we first implemented random grain positioning, the critical radius did not yet exist. Later, when we introduced the critical radius, we couldn't agree how to define it in this case and postponed the problem. At present, the critical radius is still sim...

1.) In this formulation, the mobility M_{\alpha \beta }^{\phi } denotes the physical mobility of an interface between two phases alpha and beta. We have writen the PF equation in a way that the parameters can easily be identified by matching to the Gibbs-Thomson equation. In the case of uncoupled gr...