Import H5EBSD File

Group (Subgroup)

IO (Input)

Description

This Filter reads from the .h5ebsd file that was generated with the Import Orientation File(s) to H5EBSD Filter.


Read H5Ebsd File User Interface


  • The user can use the checkboxes under the Data Arrays to Read section to select which specific data arrays they are interested in importing.
  • The user can select a subset of the slices if they do not wish to import the entire volume.
  • The type of transformations that are recommended based on the manufacturer of the data are also listed with a checkbox that allows the user to toggle the recommended transformations on and off.
  • The user should select the Euler angle representation. (This is only available if the Use Recommended Transformations is turned on.)

Notes About Transformations

The user is solely responsible for knowing any sample reference frame transformations, crystal reference frame transformations and how the Euler angles are represented in the file. DREAM.3D provides historically correct transformations from a few of the EBSD manufacturers under the assumption that the EBSD instrument has been setup according to their guidelines. The user is strongly encouraged to discuss these topics with the person(s) who were responsible for collecting the data. For example the IPF images presented below were generated from an H5Ebsd file that was generated using a CTF file. The difference is that the Incorrect image did not correctly select the Angle Representation combo box on the filter's user interface. The Euler angles were actually in degrees but were treated as if the values were in radians. The correct image is on the right.

If the user does not want the Read H5Ebsd filter to perform any transformations then the checkbox can be unchecked and the user can manually perform any desired transformations by inserting the appropriate filters into the pipeline. The suggested filters are:

An excellant reference for this is the following PDF file: http://pajarito.materials.cmu.edu/rollett/27750/L17-EBSD-analysis-31Mar16.pdf

Incorrect Correct
Read H5Ebsd File User Interface Read H5Ebsd File User Interface
Euler angles were treated as Radians Euler angles were converted from Degrees to Radians
"Interstitial Free (IF) Steel courtesy of [1]"

The Axis Alignment Issue for Hexagonal Symmetry [2]

  • The issue with hexagonal materials is the alignment of the Cartesian coordinate system used for calculations with the crystal coordinate system (the Bravais lattice).
  • In one convention (e.g. EDAX.TSL), the x-axis, i.e. [1,0,0], is aligned with the crystal a1 axis, i.e. the [2,-1,-1,0] direction. In this case, the y-axis is aligned with the [0,1,-1,0] direction. (Green Axis in Figure 1)
  • In the other convention, (e.g. Oxford Instr, Univ. Metz software), the x-axis, i.e. [1,0,0], is aligned with the crystal [1,0,-1,0] direction. In this case, the y-axis is aligned with the [-1,2,-1,0] direction. (Red Axis in Figure 1)
  • This is important because texture analysis can lead to an ambiguity as to the alignment of [2,-1,-1,0] versus [1,0,-1,0], with apparent 30 shifts in the data.
  • Caution: it appears that the axis alignment is a choice that must be made when installing TSL software so determination of which convention is in use must be made on a case-by-case basis. It is fixed to the y-convention in the HKL software.
  • The main clue that something is wrong in a conversion is that either the 2110 & 1010 pole figures are transposed, or that a peak in the inverse pole figure that should be present at 2110 has shifted over to 1010.
  • DREAM.3D uses the TSL/EDAX convention.
  • The result of this is that the filter will AUTOMATICALLY add 30 to phi2 when reading Oxford Instr (.ctf) files or .h5ebsd files denoted with the HKL manufacturer ID. There is no way to turn off this behavior.

Figure 1 showing TSL \& Oxford Instr. conventions.

Parameters

Name Type Description
Input File File Path The input .h5ebsd file path
Start Slice Int The first slice of data to read
End Slice Int The last slice of data to read
Use Recommended Transformations bool Whether to apply the listed recommended transformations
Data Arrays to Read Bool(s) Whether to read the listed arrays
Angle Representation Int (0=Radians, 1=Degrees) How the Euler Angles are represented.

Required Geometry

Not Applicable

Required Objects

None

Created Objects

Kind Default Name Type Component Dimensions Description
Data Container ImageDataContainer N/A N/A Created Data Container name with an Image Geometry
Attribute Matrix CellData Cell N/A Created Cell Attribute Matrix name
Attribute Matrix CellEnsembleData Cell Ensemble N/A Created Cell Ensemble Attribute Matrix name

An array for each of the arrays selected in the Data Arrays to Read section will also be created.

Example Pipelines

  • 02_Adaptive Alignment - Misorientation - Zero Shifts
  • (10) SmallIN100 Full Reconstruction
  • 03_Adaptive Alignment - Mutual Information - SEM Images
  • 04_Steiner Compact
  • (02) SmallIN100 Initial Visualization
  • (03) SmallIN100 Alignment

Please see the description file distributed with this Plugin

References

[1] 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)

[2] Rollett, A.D. Lecture Slides located at http://pajarito.materials.cmu.edu/rollett/27750/L17-EBSD-analysis-31Mar16.pdf

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