Artifact?

solid-solid phase transformations, influence of stresses and strains
Bernd
Posts: 1504
Joined: Mon Jun 23, 2008 9:29 pm

Thread has been split

Post by Bernd » Thu Feb 14, 2013 3:08 pm

The thread has been split up here to the following location for discussion of installation problems:

MICRESS technical issues / installation/platforms / Problems with installation of version 6

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zhubq
Posts: 84
Joined: Mon Jun 22, 2009 7:33 pm

Re: Artifact?

Post by zhubq » Fri May 17, 2013 3:09 am

Hi Bernd,

Yes, Now I am using Version 6.
A question: for those output files e.g. intf, c2ha3, driv, what's the cutoff, phasemin? Is that the same for outputs of TabC file?

Thank you.

Ben

Bernd
Posts: 1504
Joined: Mon Jun 23, 2008 9:29 pm

Re: Artifact?

Post by Bernd » Thu May 23, 2013 3:04 pm

Hi Ben,

sorry, somehow I was confused and overlooked your question - did you edit your previous post?

Anyway, the answer to your question is as follows:

The cutoff essentialy is phMin in both cases, all interface cells with higher fraction are shown in the corresponding phase composition output and included in the .TabC Results.

A more precise answer is the following:
In MICRESS, the interface regions are subdivided into an inner part (corresponding to e.g. the part shown in the .driv output) and an outer part (one single boundary cell around the inner part, included e.g.in .intf). Only for the inner part, redistribution of concentration is done and the driving force is calculated.
In order to reduce fluctuations, a hysteresis approach is used: If a fraction corresponding to the product of the minimum phase fraction and a hysteresis factor is exceeded, a cell is switching from the outer to the inner part. On the other hand, to leave the inner part, the fraction has to fall below phMin. The hysteresis factor is 2.0 by default, but can be defined by the user as second optional parameter in the line with phMin (see here).
This rule should be effective for both, the phase compositon output as well as .TabC. Differences could perhaps exist in triple junctions where the phase compostion could be different in different phase interactions.
In older versions (before 5.5), there was a cutoff of 0.5 for .TabC.

Bernd

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