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EBSD patterns consist of complex arrays of Kikuchi lines and networks of projected zone axes. In order to be able to use these patterns for crystallographic analysis, a set of quantitative and qualitative parameters are needed. These parameters are mainly the equivalent electron source point on the pattern, or pattern centre, specimen-to-detector distance, interzonal angles, Bragg angles, interplanar angles, and interplanar spacing.
Table 2337a. Example of EBSD measurement conditions.
Measured volume |
Measurement details |
Time |
Reference |
Main |
Others |
Smaller
volume |
55 parallel layers separated by 50 nm; area: 165 µm x 40 µm; beam step size:
0.5 µm; 24.9 ms per point |
Eight frames were averaged
for each point; indexing: a maximum of 32
reflectors is selected, band edge detection,
standard divergence, a Hough resolution of 60; orientations
were determined from between five and seven bands |
Data acquisition: ~11 min |
[1] |
Larger data set |
325 parallel layers separated by 100 nm; area: 218.5 µm x 57.5 µm; beam step size:
0.5 µm; 24.9 ms per point |
FIB milling: 130 s; Data acquisition: ~21 min |
[1] |
| The resolution of the grain boundary
plane measurement has been determined to be ~7.5°. |
[3,4] |
Table 2337b. Example of EBSD data analysis.
Method |
Reference |
| Most Grain Boundary Character Distributions (GBCD)
published are computed using a method based on dividing
five-dimensional boundary space into bins and ‘counting’ boundaries
ascribed to each bin |
[2] |
| GBCDs are typically presented as a series of sections for fixed
misorientations and varying boundary normals. |
[2] |
[1] Madeleine N. Kelly, Krzysztof Glowinski, Noel T. Nuhfer, Gregory S. Rohrer, The five parameter grain boundary character distribution of a-Ti determined from three-dimensional orientation data, Acta Materialia 111 (2016) 22-30.
[2] D.M. Saylor, A. Morawiec, G.S. Rohrer, Distribution of grain boundaries in
magnesia as a function of five macroscopic parameters, Acta Mater. 51 (2003)
3663e3674. https://dx.doi.org/10.1016/s1359-6454(03)00181-2.
[3] D.M. Saylor, A. Morawiec, G.S. Rohrer, Distribution of grain boundaries in
magnesia as a function of five macroscopic parameters, Acta Mater. 51 (2003)
3663e3674. https://dx.doi.org/10.1016/s1359-6454(03)00181-2.
[4] K. Glowinski, A. Morawiec, Analysis of Experimental Grain Boundary Distributions
Based on Boundary-Space Metrics, Metall. Mater. Trans. Phys. Metall.
Mater. Sci. 45A (2014) 3189e3194. https://dx.doi.org/10.1007/s11661-014-2325-y.
|
