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Analyze your measurements readily
ATEX© - Analysis Tools for Electron and X-ray diffraction
Help
ATEX© - Analysis Tools for Electron and X-ray diffraction
- Install it on the computer you plane to use to analyze your data.
- The computer need an internet connection.
- You will also probably have to authorize your antivirus to install the program.
- Prefer an install on a computer equipped with a large screen.
- Avoid c:/program files if you are not administrator of your computer.
- If you installed ATEX on a laptop, don't forget to put your icon size to 100% and probably reboot (if you want to see correctly all the buttons).
- Simply fill the form correclty
Click on the update button (red button), ATEX will close, and update module will open.
- Update (48Mo to download).
- When it is done, click on "open ATEX" button (the red button is not visible anymore).
If windows rescale the buttons, disable the option "Let Windows try to fix apps so they're not blurry" in Advanced scaling settings.
A specific name of extension is associated to each kind of data, note that data can be experimental as well as simulated
| Data Types | File Extensions | State |
|---|---|---|
| Electron Backscatter Diffraction | .EBSD.atex | ready |
| Electron Backscatter Diffraction + kikuchi patterns | .KIKU.atex | ready |
| Electron Backscatter Diffraction 3D | .EB3D.atex | in progress |
| Orientations List | .ORLI.atex | ready |
| X-Ray Incomplete Pole Figures | .XIPF.atex | ready |
| X-Ray Diffraction Profiles | .PROF.atex | ready |
| X-Ray 2D Detector | .X_2D.atex | ready |
| X-Ray 2D Detector + Spatial Information | .X2DX.atex | in progress |
| Orientation Density Function (ODF) | .CODF.atex | ready |
| Raman Microscopy | .RAMA.atex | ready |
The reference system of an EBSD map is centered on the left top corner, axis 1 is directed toward the right, axis 2 toward the bottom and axis 3 toward inside the screen.
| Cubic |  |
Hexagonal |  |
Tetragonal |  |
| Orthorhombic |  |
Monoclinic |  |
Triclinic |  |
Note that if your crystal is not defined as above, it will not be recognized by ATEX, example for the tetragonal symmetry it is "c" which must be different from "a" and "b".
Ref: wikipedia, Bravais lattice
Code: (copy and past it in your code)
*.ctf (Channel Text File) from Oxford or Bruker
*.ang (hexagonal or square grids) from EDAX
*.txt (custom files)
The strategy to assign an orientation to non-indexed pixels is: First the non-indexed pixels surrounded by 8 indexed pixels displaying a misorientation less than 3° are indexed by the mean orientation of these 8 neighbouring pixels. Several loops are performed, until all non-indexed pixels are corrected. Then, the procedure is repeated with 7 neighbours, 6… down to 1 neighbour pixel. The procedure is stopped when all the non-indexed pixels have been corrected. Example with 6 neighbour pixels:
The strategy to assign a new orientation to a spike is as follows: The spikes displaying at least seven indexed neighbour pixels misoriented by less than 3° are re-oriented by the mean orientation of those 7 or 8 neighbour pixels. One or two loops can be set by the user. The procedure is limited to two loops to avoid important changes of the original map. See the figure bellow.
L. S. Tóth, P. Gilormini, J. J. Jonas, Acta Metallurgica 1988, 36, pp.3077-3091
J. Baczynski, J. J. Jonas, Acta Materialia 1996, 44, pp.4273-4288
B. Beausir, L. S. Tóth, K. W. Neale, Acta Materialia 2007, 55, pp.2695-2705
Y. Zhou, K. W. Neale, L. S. Tóth, Acta Metallurgica 1991, 11, pp.2921-2930
M. Hölscher, D. Raabe, K. Lücke, Steel Research 1991, 62, pp.567-575
B. Beausir, S. Biswas, D. I. Kim, L. S. Tóth, S. Suwas, Acta Materialia 2009, 57, pp.5061-5077
Grain Tolerance Angle and grain detection
The procedure to define the grains is the following; The misorientation of each pixel with his four (north, south, east and west) neighbours is examined.
When the misorientation exceeds the “grain tolerance angle”, a boundary is defined.
Once all the pixels boundaries are defined, a flood-fill procedure is applied to search for sub-surfaces delimitated by a close boundary.
The latter are defined as grains.
The file ATEX_OUT_InfosGrains.OUT give information about the detected grains.
If a grain displays a boundary with another grain, these two grains are called “first neighbours”. They represent a “pair” of grains, or a pair of neighbours. The four neighbouring pixels are considered (North, East, West and South). The list of the first neighbours of each grain can be found in the NEIGHBORS.OUT file; by row: ID; number of neighbours (NbNbors); ID of the neighbours (ID_Neighbors).
The file ATEX_OUT_Neighbors.OUT give information about the detected grains.
Average grain size (for all the map) can be found in "Statistics" tab.
- "av. grain size (EqCA)" : The surface of each induvidual grain is calculated by the grain detection, then the diameter of the equivalent circle area is calculated from the formula bellow and the average of those diameters give the average grain size.
- "av. grain size (Surf)" : The surface of the map is divided by the total number of grains in the map which give the average surface of a grain, then the diameter of the equivalent circle area is calculated from the formula bellow giving the average grain size.
The grain size d is defined as follow: d = 2 * sqrt ( S / pi ).
Where S is the surface of the grains.
Once the grains are detected and their gravity centres known, the grains are fitted by ellipses. From the fit the big axis a and the small axis b as well as the angle of the big axis with the direction 1 of the sample are obtained. Thus the ellipticity of each grains is calculated as follow: E = 1 - b / a
For a circle the ellipticity is zero and when a >> b the ellipticity tends to 1.
Note that the grains on the map borders are not considered.
- Disorientation from gravity center orientation
"DISOR_GRAV" map is the disorientation between the orientations of the gravity center and each pixel in the grain.
"W1_GRAV" map is the disorientation between the orientations of the gravity center and each pixel in the grain w/r to the X-axis of the sample.
"W2_GRAV" map is the disorientation between the orientations of the gravity center and each pixel in the grain w/r to the Y-axis of the sample.
"W3_GRAV" map is the disorientation between the orientations of the gravity center and each pixel in the grain w/r to the Z-axis of the sample.
"AV_GrO" map is the average per grain of the disorientation between the orientations of the gravity center orientation and each pixel in the grain.
- Disorientation from average grain orientation
"DIS_AV" map is the disorientation between the average orientation and each pixel of the grain.
"AV_AvO" map is the average per grain of the disorientation between the average orientation and each pixel of the grain.
W. Pantleon, Resolving the geometrically necessary dislocation content by conventional electron backscattering diffraction, Scripta Materialia 2008, 58, 994-997.
- "GNDij", ij-components of the Nye Tensor, unit is L-1, [L] being the space units of your data file probably µm)
- "GNDnorm", entrywise norm of the Nye Tensor, unit is L-1.
Note if you want m-2 you can divide it by the lentgh of the Burgers vector 1/b*||a||
"DCLij", ij-component of the disclination density tensor components, units is L-2
see: B. Beausir, C. Fressengeas, Disclination densities from EBSD orientation mapping
International Journal of Solids and Structures 2013, 50, pp.137-146.
Single crystal rank 2 tensor:
Single crystal rank 4 tensor:
Polycrystal rank 2 tensor:
Average elastic properties:
- In KA:
- For the polycrystal:
Assumptions:
- Reuss (Lower Bound):
- Voigt (Upper Bound):
- Hill:
The calculation is too long to be in the movie, the maps corresponding to the different areas are automatically created at the end of the calculation.
To use the map calculator, if your computer is 64bits, you need to install the "tsc64.dll" on your computer, follow the next two steps.
for more information about this dll, follow this link
https://helloacm.com/quick-tutorial-to-64-bit-tablacus-scripting-control/
1 - Download the "tsc64.dll" here:
and place it where the "regsvr32.exe" is located, probably c:\windows\system32
2 - Download the install_tsc64dll.bat file here:
,right click on install_tsc64dll.bat file and execute it "as administrator"
If you want to uninstall it, download the uninstall_tsc64dll.bat file here:
and execute it "as administrator"
R. Guillen, C. Cossu, T. Jacquot, M. Francois, B. Bourniquel, J. Appl. Cryst. 1999, 32,pp.387-392
J.J. Heizmann, A. Vadon, D. Schlatter, J. Bessieres, Advances in X-ray Analysis. 1989, 32,pp.285-292
You can plot textures from data coming from EBSD, 3D EBSD, ODF or an orientation list, the following video is the same for all these kinds of data
H.J. Bunge HJ, Z. Metallkde 1965, 56, pp.872-874
H.J. Bunge, 1987. Theoretical Methods of Texture Analysis. DGM Informationsgesellschaft, Frankfurt, Germany
You can plot textures from data coming from EBSD, 3D EBSD, ODF or an orientation list, the following video is the same for all these kinds of data
H.J. Bunge HJ, Z. Metallkde 1965, 56, pp.872-874
H.J. Bunge, 1987. Theoretical Methods of Texture Analysis. DGM Informationsgesellschaft, Frankfurt, Germany
You can plot textures from data coming from EBSD, 3D EBSD, ODF or an orientation list, the following video is the same for all these kinds of data
H.J. Bunge HJ, Z. Metallkde 1965, 56, pp.872-874
H.J. Bunge, 1987. Theoretical Methods of Texture Analysis. DGM Informationsgesellschaft, Frankfurt, Germany
L. S. Tóth, P. Gilormini, J. J. Jonas, Acta Metallurgica 1988, 36, pp.3077-3091
J. Baczynski, J. J. Jonas, Acta Materialia 1996, 44, pp.4273-4288
B. Beausir, L. S. Tóth, K. W. Neale, Acta Materialia 2007, 55, pp.2695-2705
Y. Zhou, K. W. Neale, L. S. Tóth, Acta Metallurgica 1991, 11, pp.2921-2930
M. Hölscher, D. Raabe, K. Lücke, Steel Research 1991, 62, pp.567-575
B. Beausir, S. Biswas, D. I. Kim, L. S. Tóth, S. Suwas, Acta Materialia 2009, 57, pp.5061-5077
L. Zuo, J. Muller, C. Esling, J. Appl. Cryst 1993, 26, pp.422-425
L. Zuo, J. Muller, C. Esling, J. Appl. Cryst 1994, 27, pp.358-361
L. Zuo, M. Humbert, C. Esling, J. Appl. Cryst 1993, 26, pp.302-304
Single crystal rank 2 tensor:
Single crystal rank 4 tensor:
Polycrystal rank 2 tensor:
Average elastic properties:
- In KA:
- For the polycrystal:
Assumptions:
- Reuss (Lower Bound):
- Voigt (Upper Bound):
- Hill:
A. Molinari, G. R. Canova, S. Ahzi, Acta Metall 1987, pp.2983-2994
A. Molinari, L. S. Toth, Acta Metall Mater 1994, pp.2453-2458
Let A and B two textures expressed on the basis of spherical harmonics,
and
the corresponding series of complex numbers.
The correlation coefficient between the two textures is then given by:
If C(l)=1 then A and B are proportional at rank l
A and B will be identical if both all C(l)=1 and all P(l)=1
In n-degrees of freedom problem, the probability that the
variable be less than a certain value t0 is the student's t-distribution Q(t,n).
Thus the value 1-Q(t,n) is the confidence level at which the hypothesis of a correlation due to chance is invalidated.
Texture Index:
Texture Difference Index:
V-delta Parameter:
Direct Correlation:
High Ranks:
Low Ranks:
- Random distribution - Number of orientations
The Euler space is randomly discretized at the chosen number of points.
The volume fraction of each orientation is calculated from the ODF in a subspace having a radius depending on the maximum disorientation angle of the crystal structure and the chosen number of points.
- Fixed number of orientations
The Euler space is discretized randomly and homogeneously.
Depending on the chosen number of points, a minimal disorientation between the orientations is deduced.
The volume fraction of each orientation is calculated from the ODF in a subspace having as radius this disorientation.
- Regular Grid
The Euler space is discretized on a regular grid defined by the chosen angular resolution. The volume fraction of each orientation is calculated from the ODF in a subspace having as radius the chosen angular resolution.
- Random distribution - Disorientation
The Euler space is discretized randomly and homogeneously. Depending on the chosen minimal disorientation between the orientations, the number of points is deduced. The volume fraction of each orientation is calculated from the ODF in a subspace having as radius this disorientation.
- Constant weight
The Euler space is discretized on a regular grid defined by the chosen angular resolution. At each node of the grid the volume fraction of the ODF is evaluated. To represent this volume fraction, a number of orientations of constant weight are randomly generated around the node. Note that the final orientations did not lie on a regular grid.
