Smoothening of grain boundaries

ripening phenomena, dislocations, grainboundary topology
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Smoothening of grain boundaries

Post by khushbu » Sat May 15, 2021 2:21 pm

Hi Bernd,

I am using a grain input file for the initial microstructure, its a deformed microstructure hence the grain boundaries are not very smooth. Could you please suggest how to smoothen them out?


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Re: Smoothening of grain boundaries

Post by Bernd » Sun May 16, 2021 11:08 am

Dear Khushbu,

Welcome to the MICRESS Forum!

The simplest method to smooth out an initial microstructure (wherever it comes from) is to use the initialisation steps which you can define in the section "Numerical parameters" under "Phase field solver":

#Number of steps to adjust profiles of initially sharp interfaces [exclude_inactive]?

Here you define the number of phase-field time steps which will be applied at the beginning to convert initially sharp interfaces to the correct diffuse interface profile. As a side effect, this initialisation also makes the interfaces smoother, especially when using a high number of these steps.
This should do what you need, if I understood your problem correctly. Please note that these initialisation steps are pure phase-field solver steps, so in case of concentration coupling and multiple phases, the phase fractions may be altered but concentrations are not changed.

Best regards

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