Improved EBSD indexation accuracy by considering energy distribution of diffraction patterns

Shi, Qiwei; Jiao, Liyao; Loisnard, Dominique; Dan, Chengyi; Chen, Zhe; Wang, Haowei; Roux, Stéphane

doi:10.1016/j.matchar.2022.111909

Cited by 7 publications

(5 citation statements)

References 44 publications

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“…The method IDIC-D once again demonstrates the high extendibility of integrated digital image correlation in EBSD analyses. The radial distortion parameter adds to the growing list of accessible physical quantities by IDIC-EBSD: displacement gradient tensor [7,8,9], Euler angle triplet and projection center coordinates [22], overlapping Kikuchi bands at grain boundaries [25], distribution of heterogeneous electron energies of EBSPs [28]. Whenever a physical quantity can be incorporated in the (efficient) generation of a simulated EBSP from pre-calculated master patterns, it can be identified via the correlation with the experimental patterns.…”

Section: Algorithm Of Idic-d To Assess Radial Distortionmentioning

confidence: 99%

“…The brightness profile of Kikuchi bands is closely linked to the sample tilt angle [26]. The inhomogeneous distribution of diffracted electron energy influences the K-band width at different parts of the patterns [27], and IDIC has demonstrated its capability to identify the electron energies and thus provide better indexation results [28]. Kikuchi bands have brighter upper edges and darker lower ones, a phenomenon named excess-deficiency (abbreviated as ED hereinafter).…”

Section: Introductionmentioning

confidence: 99%

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Improved high-resolution EBSD analyses by correcting radial distortion of electron diffraction patterns

Shi

Plancher

Loisnard

et al. 2022

Materials Characterization

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Section: Algorithm Of Idic-d To Assess Radial Distortionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Improved high-resolution EBSD analyses by correcting radial distortion of electron diffraction patterns

Shi

Plancher

Loisnard

et al. 2022

Materials Characterization

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“…A proper cost function, which incorporates the noise level of experimental EBSPs, is proposed to lower calibration uncertainty. The algorithm is also highly tunable, and the number of targeting parameters can be modified freely to adapt to different scenarios [22,23]. For example, the IDIC variant based on the pattern Gradients (IDIC-G) [24] can be used to accommodate the excess-deficiency effect.…”

Section: Introductionmentioning

confidence: 99%

“…However, most previous works focused on the uncertainty rather than the accuracy of indexation, as the true values of crystal orientation are seldom known. One exception is Si wafer samples with known cutting planes, in which case large EBSD scans help to calibrate the EBSD setup, and thus better assess the orientation accuracy [23]. One possible solution to the absence of true crystal orientation is to estimate the accuracy of the simulated patterns [4,11], but the conclusion needs to be validated on experimental data.…”

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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“…These electrons form a diffraction pattern [36] on a digital sensor and software interprets the lattice phase and orientation of the scattering site [37,38]. With processing times of a few milliseconds per site, an EBSD map of an area can be collected within an hour or a few hours, with several million data points [39,40].…”

Section: Introductionmentioning

confidence: 99%

In Situ Uniaxial Compression of Textured Magnesium AZ31B

Whitmore,

Nischler,

Saage

et al. 2023

Metals

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Strain-controlled uniaxial compression tests on textured magnesium AZ31B sheet samples were carried out using a 5 kN Kammrath & Weiss tension–compression in situ stage using a scanning electron microscope in combination with real-time electron backscatter diffraction lattice orientation mapping. The distribution of deformation twins in the samples was studied and correlated with the results of finite element simulation of the elastic strain to show that bands of twinned grains formed in areas where the principal compressive stress (σ3) was a maximum, and they formed normal to the trajectory of the principal direction of σ3. This was correlated with maps of lattice disorientation within the grains, which showed the inclination for twins to grow in alignment with local and larger-scale distributions of elastic strain. Mappings of the same area at different values of strain were made to examine the formation and growth of individual twins within the macroscopic bands of twinned grains. All the twins observed were consistent with the extension-type twin, with 86.3° disorientation with respect to the parent grain. Mappings of the grain internal disorientation were related to the elastic strain, and it was found that twin formation and growth followed the contours of the highest elastic strain within and across grains. The maximum angular disorientation found within the grains was approximately 10°, suggesting that this might correspond to a threshold of elastic strain required to initiate twinning.

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Improved EBSD indexation accuracy by considering energy distribution of diffraction patterns

Cited by 7 publications

References 44 publications

Improved high-resolution EBSD analyses by correcting radial distortion of electron diffraction patterns

Improved high-resolution EBSD analyses by correcting radial distortion of electron diffraction patterns

Accuracy assessment of crystal orientation indexations by EBSD

In Situ Uniaxial Compression of Textured Magnesium AZ31B

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