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Journal ArticleDOI

Accurate determination of grain properties using three-dimensional synchrotron X-ray diffraction: A comparison with EBSD

01 Jan 2021-Materials Characterization (Elsevier)-Vol. 171, pp 110753
TL;DR: In this paper, an in-situ three-dimensional synchrotron X-ray diffraction experiment is conducted on a polycrystalline zirconium specimen, and the data obtained from the experiment are used to develop methods to reconstruct 3D grain maps by adding the grain layers measured by a planar Xray beam, and to track individual grains across loading steps.
About: This article is published in Materials Characterization.The article was published on 2021-01-01. It has received 8 citations till now. The article focuses on the topics: Grain boundary & Electron backscatter diffraction.
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Journal ArticleDOI
13 Jan 2021
TL;DR: In this article, in-situ compression-tension experiments conducted on magnesium specimens to measure the evolution of grain resolved tensorial stresses and formation and annihilation of twins were conducted.
Abstract: The mechanical response of polycrystalline materials to an externally applied load and their in-service performance depend on the local load partitioning among the constituent crystals In hexagonal close-packed polycrystals such load partitioning is significantly affected by deformation twinning Here we report in-situ compression-tension experiments conducted on magnesium specimens to measure the evolution of grain resolved tensorial stresses and formation and annihilation of twins More than 13000 grains and 1300 twin-parent pairs are studied individually using three-dimensional synchrotron X-ray diffraction It is shown that at the early stages of plasticity, the axial stress in twins is higher than that of parents, yet twins relax with further loading While a sign reversal is observed for the resolved shear stress (RSS) acting on the twin habit plane in the parent, the sign of RSS within the majority of twins stays unchanged until twin annihilation during the load reversal The variations of measured average stresses across parents and twins are also investigated Load partitioning to grains during deformation of a polycrystalline material is affected by the presence of twins Here, synchrotron diffraction is used to study 1300 twin-parent grains, revealing that stress is higher in twins than in the parent grain during the early stages of plastic deformation

12 citations

Journal ArticleDOI
01 Nov 2021-JOM
TL;DR: In this article, a multi-modal data-merging framework that enables the reconstruction of slip bands in three dimensions over millimeter-scale fields of view is presented. But this method is not suitable for high-resolution data.
Abstract: A multi-modal data-merging framework that enables the reconstruction of slip bands in three dimensions over millimeter-scale fields of view is presented. The technique combines 3D electron back-scattered diffraction (EBSD) measurements with high-resolution digital image correlation (HR-DIC) information collected in the scanning electron microscope (SEM). A typical merging workflow involves the segmentation of features within the strain field (slip bands, deformation twins) and the microstructure (grains), alignment of datasets and the projection of slip bands into the 3D microstructure, using the knowledge of the local crystallographic orientation. This method is demonstrated in two materials: a face-centered cubic (FCC) nickel-base superalloy and hexagonal close-packed (HCP) titanium alloy.

10 citations

Journal ArticleDOI
TL;DR: In this article , a non-local crystal plasticity finite element model is coupled with hydrogen diffusion equations to study the effects of such parameters on the stress-assisted diffusion of hydrogen atoms in zirconium polycrystals.

4 citations

Journal ArticleDOI
TL;DR: In this paper , in-situ neutron diffraction experiments were conducted on nickel superalloy specimens to understand how mechanical ansitropy and the evolution of internal strains are affected by changing the LPBF-AM parameters.

4 citations

Journal ArticleDOI
TL;DR: In this paper, 3D electron backscatter diffraction (3D-EBSD) is used to characterize fine titanium microstructures and a detailed description of the new algorithms developed for probing the unique features therein is presented.

4 citations

References
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Journal ArticleDOI
TL;DR: The role of deformation twinning in fracture of hexagonal close-packed metals is reviewed from a theoretical point of view in this paper, where strength and ductility are correlated with the intrinsic physical and metallurgical variables.
Abstract: The role of deformation twinning in fracture of hexagonal close-packed metals is reviewed from a theoretical point of view. Strength and ductility are correlated with the intrinsic physical and metallurgical variables. The importance of c + a slip and of both “tension” and “compression” twins as independent modes for a generalized polycrystalline deformation is emphasized. Effects of slip-twin and twin-twin interactions on crack initiation and high-order twinning are reviewed. The competitive role of twin nucleationvs crack initiation is discussed. Shortcomings of our current understanding of the role of twinning are indicated, and some futher studies are recommended.

1,556 citations

Journal ArticleDOI
TL;DR: It is demonstrated that the shift between similar features in two electron backscatter diffraction patterns can be measured using cross-correlation based methods to +/- 0.05 pixels, which is an impressive and unique combination of high strain sensitivity, high spatial resolution and ease of use.

591 citations

Journal ArticleDOI
TL;DR: This paper conducted a statistical analysis on large data sets generated by electron backscattering diffraction (EBSD) to extract quantitative and meaningful relationships between material microstructure and deformation twinning in magnesium.
Abstract: To extract quantitative and meaningful relationships between material microstructure and deformation twinning in magnesium, we conduct a statistical analysis on large data sets generated by electron backscattering diffraction (EBSD). The analyses show that not all grains of similar orientation and grain size form twins, and twinning does not occur exclusively in grains with high twin Schmid factors or in the relatively large grains of the sample. The number of twins per twinned grain increases with grain area, but twin thickness and the fraction of grains with at least one visible twin are independent of grain area. On the other hand, an analysis of twin pairs joined at a boundary indicates that grain boundary misorientation angle strongly influences twin nucleation and growth. These results question the use of deterministic rules for twin nucleation and Hall–Petch laws for size effects on twinning. Instead, they encourage an examination of the defect structures of grain boundaries and their role in twin ...

444 citations

Journal ArticleDOI
TL;DR: In this paper, a study of the mechanical response of Mg AZ31 when deformed under twinning dominated conditions is presented, and it is concluded that the texture variation due to twinning is sufficient to explain the observed macroscopic stress-strain response.

410 citations