12.6. Compute Feature Boundary Strength Metrics

Group (Subgroup)

Statistics (Crystallography)

Description

This Filter computes slip transmission metrics for each Face (triangle) on a grain boundary mesh. These metrics quantify how easily plastic deformation can transfer across a grain boundary, based on the geometric alignment of slip systems in the two grains on either side.

This filter computes the same metrics as the Compute Neighbor Slip Transmission Metrics filter, but stores results per boundary Face rather than per Feature. This makes it suitable for visualization and analysis on a Triangle Geometry surface mesh.

For a detailed explanation of the slip transmission concept and the individual metrics, see the Compute Neighbor Slip Transmission Metrics documentation.

Cubic Materials Only

This filter only works on cubic m-3m Laue classes.

How This Filter Works

1. For each Face in the Triangle Geometry, the filter identifies the two Features on either side

2. The average orientation of both Features is retrieved

3. Transmission metrics are calculated in both directions (Feature 1 → Feature 2 and Feature 2 → Feature 1), since the direction of slip approaching the boundary affects the result

4. Both directional values are stored on the Face

Luster-Morris Parameter (M’)

The Luster-Morris parameter measures geometric compatibility between slip systems across a boundary. Calculated as presented in [1].

Fracture Initiation Parameters (F1, F1spt, F7)

Three fracture initiation parameter values are computed per Face, as defined in [2] (see page 021012-4):

References

[1] Luster, J., Morris, M.A., 1995. Compatibility Of Deformation In Two-Phase Ti-Al Alloys: Dependence On Microstructure And Orientation Relationships. Metallurgical and Materials Transactions A 26, 1745

[2] D. Kumar, T. R. Bieler, P. Eisenlohr, D. E. Mason, M. A. Crimp, F. Roters, and D. Raabe. On Predicting Nucleation of Microcracks Due to Slip Twin Interactions at Grain Boundaries in Duplex Near γ-TiAl. Journal of Engineering Materials and Technology, 130(2):021012–12, 2008. doi:10.1115/1.2841620.

Required Input Sources

This filter operates on a grain-boundary surface mesh and requires the following upstream steps:

• Triangle Geometry and Face Labels – produced by a surface meshing filter such as Quick Surface Mesh.

• Average Quaternions – the per-feature average orientation 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
Loading Direction (XYZ)	Vector of Float64 Values	Order=x,y,z	The loading axis for the sample

Input Triangle Face Data

Parameter Name	Parameter Type	Parameter Notes	Description
Face Labels	Array Selection	Allowed Types: int32 Comp. Shape: 2	Data Array that specifies which Features are on either side of each Face

Input Feature Data

Parameter Name	Parameter Type	Parameter Notes	Description
Average Quaternions	Array Selection	Allowed Types: float32 Comp. Shape: 4	Data Array that specifies the average orientation of each Feature in quaternion representation
Phases	Array Selection	Allowed Types: int32 Comp. Shape: 1	Data Array that 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 phase

Output Face Data

Parameter Name	Parameter Type	Parameter Notes	Description
F1s	DataObjectName		DataArray Name to store the calculated F1s Values
F1spts	DataObjectName		DataArray Name to store the calculated F1spts Values
F7s	DataObjectName		DataArray Name to store the calculated F7s Values
mPrimes	DataObjectName		DataArray Name to store the calculated mPrimes Values

Example Pipelines

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.