12.9. Compute Feature Neighbor Misorientations

Group (Subgroup)

Statistics (Crystallography)

Description

This Filter computes the misorientation angle between each Feature (grain) and its neighboring Features. Misorientation is the angular difference between the crystal orientations of two grains – it describes how much one grain’s crystal lattice is rotated relative to another’s.

Fig. 1: The misorientation between two grains is the rotation relating their crystal orientations; its angle is the misorientation angle. Because a crystal has symmetry-equivalent orientations, the smallest equivalent angle — the disorientation — is what the filter reports.

For each Feature, the filter produces a list of misorientation angles (in degrees), one for each neighboring Feature it shares a boundary with. The axis of the misorientation is not stored, only the angle.

Optionally, the filter can also compute the average misorientation between a Feature and all of its neighbors. This average value provides a quick summary of how differently oriented a grain is compared to its surroundings.

Note

Only Features with identical crystal structures are compared. If two neighboring Features have different crystal structures, a value of NaN is stored for their misorientation, since misorientation between different crystal systems is not physically meaningful.

Required Input Sources

Neighbor List – produced by Compute Feature Neighbors or Compute Feature Neighborhoods.
Average Quaternions – produced by Compute Average Orientations.
Feature Phases – produced by Compute Feature Phases.
Crystal Structures – ensemble-level array read from EBSD data or created by Create Ensemble Info.

Input Parameter(s)

Parameter Name	Parameter Type	Parameter Notes	Description
Compute Average Misorientation Per Feature	Bool		Specifies if the average of the misorienations with the neighboring Features should be stored for each Feature

Input Feature Data

Parameter Name	Parameter Type	Parameter Notes	Description
Feature Neighbor List	NeighborListSelection		List of the contiguous neighboring Features for a given Feature
Feature Average Quaternions	Array Selection	Allowed Types: float32 Comp. Shape: 4	Defines the average orientation of the Feature in quaternion representation
Feature Phases	Array Selection	Allowed Types: int32 Comp. Shape: 1	Specifies to which Ensemble each Feature belongs

Input Ensemble Data

Parameter Name	Parameter Type	Parameter Notes	Description
Crystal Structures	Array Selection	Allowed Types: uint32 Comp. Shape: 1	Enumeration representing the crystal structure for each Ensemble

Output Feature Data

Parameter Name	Parameter Type	Parameter Notes	Description
Misorientation List	DataObjectName		The name of the data object containing the list of the misorientation angles with the contiguous neighboring Features for a given Feature
Average Misorientations	DataObjectName		The name of the array containing the number weighted average of neighbor misorientations.

Example Pipelines

(05) SmallIN100 Crystallographic Statistics

License & Copyright

Please see the description file distributed with this Plugin

DREAM3D-NX Help

If you need help, need to file a bug report or want to request a new feature, please head over to the DREAM3DNX-Issues GitHub site where the community of DREAM3D-NX users can help answer your questions.