### Nucleation model in MICRESS

Posted:

**Wed Feb 10, 2021 10:49 am**Dear all,

I am trying to understand the nucleation model implemented in MICRESS. I found a very old thread https://board.micress.de/viewtopic.php?f=10&t=10 discussing about it.

In this thread, it was mentioned that

In MICRESS, is there a way to use classical nucleation theory to implant the nucleus ?

Also, for solid-state precipitation processes, if I were to use Seed-undercooling or Seed-density model, how can I know the seed-density distribution or particle size ?

I am trying to understand the nucleation model implemented in MICRESS. I found a very old thread https://board.micress.de/viewtopic.php?f=10&t=10 discussing about it.

In this thread, it was mentioned that

Was there any upgrades made recently to capture the nucleation process at nano-scale ? For example, to simulate the microstructure of Ni-Al binary alloy to gamma/gamma' microstructure. In superalloys, we can get extremely small precipitate sizes (gamma') sizes (20nm~50nm). I found this article where they used classical nucleation theory to implant the gamma' nuclei.In general, these models are designed for simulation at microscale, not at nano-scale, i.e., there is no model for prediction of homogeneous nucleation based on fluctuations the formation of a critical seed.

https://www.sciencedirect.com/science/a ... 07809#SEC6Simmons, J. P., Wen, Y., Shen, C., & Wang, Y. Z. (2004). Microstructural development involving nucleation and growth phenomena simulated with the phase field method. Materials Science and Engineering: A, 365(1-2), 136-143.

In MICRESS, is there a way to use classical nucleation theory to implant the nucleus ?

Also, for solid-state precipitation processes, if I were to use Seed-undercooling or Seed-density model, how can I know the seed-density distribution or particle size ?