Group (Subgroup)
Processing (Crystallography)
Description
This Filter will generate colors based on the method developed by C. Schuh and S. Patala for cubic, hexagonal, tetragonal, or orthorhombic crystal structures (currently only the cubic high symmetry is working)[1]. Orientations are colored by disorientation relative to a reference orientation. The user can enter a Reference Orientation Axis and a Reference Orientation Angle relative to the sample reference frame. The default reference orientation is the sample frame (misorientation from sample frame: 0o about [001]). The Filter also has the option to apply a black color to all "bad" Elements, as defined by a boolean mask array, which can be generated using the Threshold Objects Filter.
Important Implementation Notes
The user should be aware of the crystal symmetry (Laue Group and Point Group) of their data. The Filter is only valid for certain point groups within a Laue group (See table below).
Color Output Notes
With other coloring methods, such as IPF, "bad" Elements which result from non-indexed EBSD scans can be colored with a black color. Since the misorientation coloring scheme uses all possible colors, marking voxels in an image in such a way that the voxels stand out is not possible.
Crystal Symmetry Implementations
| Crystal Symmetry (Laue) | Hermann–Mauguin Symbol | Schoenflies Symbol | Laue Class | Implemented (Legend) |
|---|---|---|---|---|
| Triclinic | 1, -1 | C1, C1 | -1 | Not Implemented |
| Monoclinic | 2, m, 2/m | C2, Cs, C2h | 2/m | Not Implemented |
| Orthorhombic | 222,, 2/m 2/m 2/m | D2, D2h | mmm | 
|
| Orthorhombic | mm2 | C2v | mmm | Not Implemented |
| Trigonal (Low) | 3, -3 | C3, C3i | -3 | Not Implemented |
| Trigonal (High) | 32, 3m, -32/m | D3, C3v, D3d | -3m | Not Implemented |
| Tetragonal (Low) | 4, -4, 4/m | C4, S4, C4h | 4/m | Not Implemented |
| Tetragonal (High) | 422, 4/m 2/m 2/m | D4, D4h | 4/mmm | 
|
| Tetragonal (High) | 4mmm, -42m | C4v, D2d | 4/mmm | Not Implemented |
| Hexagonal (Low) | 6, -6, 6/m | C6, C3h, C6h | 6/m | Not Implemented |
| Hexagonal (High) | 622, 6/m 2/m 2/m | D6, D6h | 6/mmm | 
|
| Hexagonal (High) | 6mm, -62m | C6v, D3h | 6/mmm | Not Implemented |
| Cubic (Low) | 23, 2/m-3 | T, Th | m-3 | 
|
| Cubic (High) | 432, 4/m -3 2/m | O, Oh | m-3m | 
|
| Cubic (High) | -43m | Td | m-3m | Not Implemented |
Example Output Images
Parameters
| Name | Type | Description |
|---|---|---|
| Reference Orientation Axis | float (3x) | The reference axis with respect to compute the disorientation |
| Reference Orientation Angle (Degrees) | float | The reference angle with respect to compute the disorientation |
| Apply to Good Elements Only (Bad Elements Will Be Black) | bool | Whether to assign a black color to "bad" Elements |
Required Geometry
Not Applicable
Required Objects
| Kind | Default Name | Type | Component Dimensions | Description |
|---|---|---|---|---|
| Element Attribute Array | Quats | float | (3) | Specifies the orientation of each Element in quaternion representation |
| Element Attribute Array | Phases | int32_t | (1) | Phase Id specifying the phase of the Element |
| Element Attribute Array | Mask | bool | (1) | Used to define Elements as good or bad. Only required if Apply to Good Elements Only (Bad Elements Will Be Black) is checked |
| Ensemble Attribute Array | CrystalStructures | uint32_t | (1) | Enumeration representing the crystal structure for each Ensemble |
Created Objects
| Type | Default Name | Type | Component Dimensions | Description |
|---|---|---|---|---|
| Element Attribute Array | MisorientationColors | uint8_t | (3) | The RGB colors encoded as unsigned chars |
References
[1] S. Patala, J. Mason, C. Schuh, 2012. Improved representations of misorientation information for grain boundary science and engineering. Prog Mater Sci. 57, 1383-1425.
[2] M. Groeber, B.K. Haley, M.D. Uchic, D.M. Dimiduk, S. Ghosh, 3D reconstruction and characterization of polycrystalline microstructures using a FIB–SEM system Data Sets. Materials Characterization 2006, 57:259—-273.
[3] N. Allain-Bonasso, F. Wagner, S. Berbenni, D.P. Field, A study of the heterogeneity of plastic deformation in IF steel by EBSD, Materials Science and Engineering: A, Volume 548, 30 June 2012, Pages 56-63, ISSN 0921-5093, http://dx.doi.org/10.1016/j.msea.2012.03.068. (http://www.sciencedirect.com/science/article/pii/S0921509312004388)
[4] http://reference.iucr.org/dictionary/Laue_classes
License & Copyright
Please see the description file distributed with this Plugin
