Concurrent High and Low Angle GBs

[Nick Byres]

Please be as detailed as possible, explain what you want to do, what kind of data you are using. Attaching simplified code and data is always useful. Click the the button { } to inline code and finally remove these lines before posting :)

Hi All,

Firstly I would like to warn you that I am new to Matlab/Mtex or any kind of coding so any advice is much appreciated.

I am trying to fill in the grain and subgrain boundaries on an IPF coloured EBSD map. So far I have manged to include HAGBs above 15 degrees however, I am struggling to superimpose LAGBs between 5 and 15 degres.

The code I have so far is:

%% Specify Crystal and Specimen Symmetries

% crystal symmetry

CS = {... 

  'notIndexed',...

  crystalSymmetry('m-3m', [3.192 3.192 3.192], 'mineral', 'Titanium cubic', 'color', 'light blue')};

% plotting convention

setMTEXpref('xAxisDirection','east');

setMTEXpref('zAxisDirection','outOfPlane');

%% Specify File Names

% path to files

pname = '\\nask.man.ac.uk\home$\Desktop\Mtex_CTFs';

% which files to be imported

fname = [pname '\1030C_30mins_Cleaned.ctf'];

%% Import the Data

% create an EBSD variable containing the data

ebsd = loadEBSD(fname,CS,'interface','ctf',...

  'convertEuler2SpatialReferenceFrame');

%% Plot IPF colours EBSD map

plot(ebsd);

oM = ipfHSVKey(ebsd('Titanium cubic'))

oM.inversePoleFigureDirection = zvector;

color = oM.orientation2color(ebsd('Titanium cubic').orientations);

plot(ebsd('Titanium cubic'),color);

hold on

% Plot HAGBs

[grains,ebsd.grainId] = calcGrains(ebsd('indexed'),'angle',15*degree);

gB = grains.boundary;

plot(gB,'linecolor','k','linewidth',2);

I have tried using innerboundaries but to no avail. IPF map attached.

Currently using mtex 5.1.1. and the file format is CTF.

Thanks for your help,

Nick

[Rüdiger Kilian]

Hi,

if you use a threshold angle of 15 degree, there'll be no boundaries detected below that angle. grains('xy').innerBoundary are simply boundaries which could not be closed - but are still above the anle threshold.
So if you wish to detect boundaries with smaller angles, you also need to do a segmentation with a lower threshold. You can do that separately into a different grain2d variable (and maybe a copy of the ebsd variable to also get grainsId) as well and combine when plotting.

[grains,ebsd.grainId] = ebsd.calcGrains('angle',15*degree);
gb = [grains.boundary('XY','XY') grains('XY').innerBoundary];
%and
ebsd_ll = ebsd;
[grains_l,ebsd_l.grainId]= ebsd.calcGrains('angle',2*degree);
gb_l = [grains_l.boundary('XY','XY') grains_l('XY').innerBoundary];
...

Alternatively, index the boundaries by an angle condition afterwards

[grains,ebsd.grainId]= ebsd.calcGrains('angle',2*degree);
gb = [grains.boundary('XY','XY') grains('XY').innerBoundary];
LAB = gb(gb.misorientation.angle<10*degree);
HAB = gb(gb.misorientation.angle>10*degree)


Hope that helps.
Cheers,
Rüdiger
________________________________________
From: mtex...@googlegroups.com <mtex...@googlegroups.com> on behalf of Nick Byres <nichol...@hotmail.com>
Sent: Wednesday, February 20, 2019 4:38:00 PM
To: MTEX
Subject: {MTEX} Concurrent High and Low Angle GBs

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[Nick Byres]

Thank you for your help and swift reply!

I will let you know how I get on.

Many thanks,
Nick

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