subgrain size

[pellegrinoluca]

Dear all,
i would to calculate the subgrains size distribution of some phases.

Considering all dataset, I can calculate subgrains by:

[grains,ebsd.grainId] = calcGrains(ebsd('indexed'),'threshold',[2*degree]);
gB=[grains.innerBoundary('En','En')]
condition = gB.misorientation.angle/degree < 10;
subgrains = grains(unique(gB(condition).grainId(:)))
plot (subgrains) % attached picture1

However I'm interested only in subgrains hosted in the large crystal of attached picture1. I used different ways to do this but something went wrong, e.g.:

[grains,ebsd.grainId] = calcGrains(ebsd('indexed'),'threshold',[10degree]);
grains_big = grains(grains.area>100000)
ebsd_big = ebsd(grains_big)
[subgrains,ebsd_big.grainId] = calcGrains(ebsd_big('indexed'),'threshold',[2degree]);
plot (subgrains) % attached picture2

Can someone halp me?

Thank you!

[kilir]

Hi,
what you see is due to the fact that you have a lot of unassigned points .
One option is to work around is mentioned here: https://mtex-toolbox.github.io/GrainReconstruction.html#11; the option 'tight' can also be supplied with a number, 0.95 is the default.
Another option maybe better suited would to replace the non-existent points explicitly by the phase 'notIndexed'.

Cheers,
Rüdiger

[pellegrinoluca]

Hi Rüdiger,
everything works now.

Thank you!
Cheers
Luca