Spherical indexing of overlap EBSD patterns for orientation-related phases – Application to titanium

Lenthe, William C.; Germain, Lionel; Chini, Maria Rita; Gey, Nathalie; Graef, Marc De

doi:10.1016/j.actamat.2020.02.025

Cited by 13 publications

(6 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Recent advances using pattern matching by Lenthe et al (2020) of overlapped BOR-related patterns offer the chance to index finer-scaled microstructures, where there may be two or more overlapping patterns within the interaction volume. Fortunately, our microstructure mapped sufficiently well (>83% success) and there is no retained in this material.…”

Section: Discussionmentioning

confidence: 99%

Effective structural unit analysis in hexagonal close-packed alloys – reconstruction of parent β microstructures and crystal orientation post-processing analysis

Birch¹,

Britton²

2022

J Appl Crystallogr

View full text Add to dashboard Cite

Materials with an allotropic phase transformation can form microstructures where grains have orientation relationships determined by the transformation history. These microstructures influence the final material properties. In zirconium alloys, there is a solid-state body-centred cubic (b.c.c.) to hexagonal close-packed (h.c.p.) phase transformation, where the crystal orientations of the h.c.p. phase can be related to the parent b.c.c. structure via the Burgers orientation relationship (BOR). In the present work, a reconstruction code, developed for steels and which uses a Markov chain clustering algorithm to analyse electron backscatter diffraction maps, is adapted and applied to the h.c.p./b.c.c. BOR. This algorithm is released as open-source code (via github, as ParentBOR). The algorithm enables new post-processing of the original and reconstructed data sets to analyse the variants of the h.c.p. α phase that are present and understand shared crystal planes and shared lattice directions within each parent β grain; it is anticipated that this will assist in understanding the transformation-related deformation properties of the final microstructure. Finally, the ParentBOR code is compared with recently released reconstruction codes implemented in MTEX to reveal differences and similarities in how the microstructure is described.

show abstract

Section: Discussionmentioning

confidence: 99%

Effective structural unit analysis in hexagonal close-packed alloys – reconstruction of parent β microstructures and crystal orientation post-processing analysis

Birch¹,

Britton²

2022

J Appl Crystallogr

View full text Add to dashboard Cite

show abstract

“…Note that the proposed method is intrinsically different from that of Ref. [24], which calculates overlapped master patterns for certain orientation-related phases before indexation. As a result, the present algorithm is less demanding in computation load and provides a very good flexibility.…”

Section: Algorithmmentioning

confidence: 99%

“…The overlap of Kikuchi bands is simulated as a mere linear combination, as proposed in Refs. [21,20,24].…”

Section: Algorithmmentioning

confidence: 99%

“…The discarded secondary Kikuchi lines could deteriorate the precision of indexation, while they would enrich the EBSD analysis if properly treated. Recently Lenthe et al proposed a strategy that relies on overlapped master patterns to index crystal orientations from overlapped EBSPs, however their method has only been applied to orientation-related phases [24]. Therefore, there exists no algorithm that is applicable to overlapped EBSPs for random crystal orientations.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Indexation of electron diffraction patterns at grain boundaries

Shi

Zhou

Zhong

et al. 2021

Materials Characterization

View full text Add to dashboard Cite

“…In parallel, there has been a recent renewed interest in the treatment of overlapped patterns. Recently, Shi et al (2021) and Lenthe et al (2020) showed the ability of the Pattern Matching technique (Ram & De Graef, 2018;Singh et al, 2018;Winkelmann et al, 2018Winkelmann et al, , 2020 to separate and index up to three overlapped signals. However, this progress did not yet translate into the resolution of finer microstructures, because in the first case the information generated was not spatially resolved, and in the second case, the signal separation was aimed at refining grain boundaries (see also Fullwood et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

A Pattern Processing Method to Map Nanoscale Phases by EBSD

2022

View full text Add to dashboard Cite

The crystallographic analysis of nanoscale phases with dimensions well below the spatial probing volume of electron backscatter diffraction (EBSD) traditionally rely on electron microscopy in transmission (either in SEM or TEM), because EBSD patterns are invariably dominated by the matrix phase contribution and present seemingly no trace from such nanoscale phases. Yet, this study shows that such nanoscale features generate a very faint but valuable secondary diffraction signal which can be retrieved. A diffraction pattern postprocessing method is presented which focuses on the detection of such secondary signal emitted by nanoscale minority phases in overlapped patterns dominated by a dominant matrix signal. The predominant, majority phase contribution in EBSD patterns is removed by a close-neighbor pattern subtraction routine, after which both the conventional Hough indexing method as well as pattern matching methods can be used to reveal the crystallography, spatial distribution, morphology, and orientation of nanoscale minority phases initially absent from EBSD maps. Nanolamellar pearlitic steel, which has long been out of reach for EBSD, has been chosen as an application example.

show abstract

Spherical indexing of overlap EBSD patterns for orientation-related phases – Application to titanium

Cited by 13 publications

References 21 publications

Effective structural unit analysis in hexagonal close-packed alloys – reconstruction of parent β microstructures and crystal orientation post-processing analysis

Effective structural unit analysis in hexagonal close-packed alloys – reconstruction of parent β microstructures and crystal orientation post-processing analysis

Indexation of electron diffraction patterns at grain boundaries

A Pattern Processing Method to Map Nanoscale Phases by EBSD

Contact Info

Product

Resources

About