Orientation, pattern center refinement and deformation state extraction through global optimization algorithms

Zhu, Chaoyi; Kurniawan, Christian; Ochsendorf, Marcus A; An, Dayong; Zaefferer, Stefan; Graef, Marc De

doi:10.1016/j.ultramic.2021.113407

Cited by 8 publications

(3 citation statements)

References 51 publications

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“…It is vital to avoid or correct the experimental setup errors in this procedure, to name a few, the sample tilt angle, the misalignment of the tilt axis, the intentional or unintentional tilt of EBSD detector around different axes. These errors pose a severe threat on EBSD characterization, especially on the 'global optimization' approach of all EBSPs of an EBSD acquisition, which takes the EBSD geometry as a key input [15,35]. There could exist unknown errors in all these aspects, and one remedy is to use the calibrated PC coordinates to correct all these potential sources of errors.…”

Section: Precision and Accuracy Of Ebsd Indexationmentioning

confidence: 99%

Improved EBSD indexation accuracy by considering energy distribution of diffraction patterns

Shi

Jiao

Loisnard

et al. 2022

Materials Characterization

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Section: Precision and Accuracy Of Ebsd Indexationmentioning

confidence: 99%

Improved EBSD indexation accuracy by considering energy distribution of diffraction patterns

Shi

Jiao

Loisnard

et al. 2022

Materials Characterization

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“…Residual stress has now successfully been mapped from the nanoscale to the bulk scale by complementary electron, optical, and x-ray-based probes, aided by forward modeling, fitting, and denoising techniques, even at the mesoscale. 55 Coupled extremes remain a challenge for both prediction and detection. Their widely varying temporal and spatial scales render solely computational or experimental approaches difficult due to the inability to access all relevant scales for transient and nonequilibrium phenomena.…”

Section: Beyond High-throughput: Autonomous Approachesmentioning

confidence: 99%

On the frontiers of coupled extreme environments

2022

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Coupled extreme environments pose among the highest demands on materials, stressing the limits of temperature, pressure, electric and magnetic fields, atomic displacement rates, and chemical potentials that can be simultaneously sustained. This issue highlights exciting new materials science methods that will enable rapid progress in what has traditionally been the most difficult materials arena. New opportunities in artificial intelligence, multi-physics simulations capabilities, the use of extreme conditions to synthesize novel materials, and our ability to interrogate materials under relevant conditions provide new avenues to understand and design new materials.

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“…Full pattern matching (FPM) methods have also been increasingly applied to EBSPs to calibrate EBSD acquisition and to refine crystal orientations [11][12][13][14][15][16][17]. FPM tunes the three coordinates of the projection center (PC) and the crystal orientation to maximize the similarity between a pair of experimental and simulated EBSPs.…”

Section: Introductionmentioning

confidence: 99%

Accuracy assessment of crystal orientation indexations by EBSD

Shi,

Loisnard,

et al. 2024

Meas. Sci. Technol.

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Accuracy and uncertainty analyses are essential for every measurement technology. In crystal orientation indexation by electron backscatter diffraction (EBSD), a series of accuracy estimations have been made for the Hough transform and dictionary indexation methods. The mean angular deviation is a standard parameter to indicate orientation accuracy, but this criterion is indirect and closely related to the accuracy of the projection center coordinates. Precise known orientation relationships are necessary to evaluate orientation accuracy without the ground truth. The current work uses the natural crystal twins and hardware orientation relationships to assess the orientation accuracy directly. The accuracy level for different EBSD analysis methods is compared through four experimental data sets of varying pattern definitions and noise levels. It is found that the full pattern match (FPM) algorithms improve the accuracy as compared to Hough indexation, and the gain varies greatly between 14% for fast acquisitions and 20 times for high-quality patterns. Depending on the resolution and quality of diffraction patterns, FPM results in an accuracy of crystal orientation between 0.04° and 0.9°. Comparing the two FPM variants, matching the gradients of diffraction patterns performs better in the case of high-to-median quality acquisitions while matching the pattern itself is more accurate for more noisy and low-definition patterns.

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Orientation, pattern center refinement and deformation state extraction through global optimization algorithms

Cited by 8 publications

References 51 publications

Improved EBSD indexation accuracy by considering energy distribution of diffraction patterns

Improved EBSD indexation accuracy by considering energy distribution of diffraction patterns

On the frontiers of coupled extreme environments

Accuracy assessment of crystal orientation indexations by EBSD

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