Ultra-low-angle boundary networks within recrystallizing grains

Ahl, Sonja Rosenlund; Simons, Hugh; Zhang, Y.B.; Detlefs, C.; Stöhr, Frederik; Jakobsen, Anders Clemen; Jensen, D. Juul; Poulsen, Henning Friis

doi:10.1016/j.scriptamat.2017.06.016

Cited by 37 publications

(25 citation statements)

References 12 publications

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“…Within the characterized region, most indexed grains are recrystallized grains, as the internal misorientations within these grains are relatively low. The KAM map (Figure 7b) shows that within recrystallized grains small orientation variations up to 0.03 • are seen, which agrees to the previous results [63]. The lower bound of the GND density within recrystallized grains calculated using Equation 2…”

Section: Microstrucure Of Partially Recrystallized Ni Processed By Acsupporting

confidence: 89%

High Resolution Mapping of Orientation and Strain Gradients in Metals by Synchrotron 3D X-ray Laue Microdiffraction

Zhang

Barabash

2019

QuBS

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Synchrotron 3D X-ray Laue microdiffraction, available at beamline 34-ID-E at Advanced Photon Source in Argonne National Laboratory, is a powerful tool for 3D non-destructive mapping of local orientations and strains at sub-micron scale in the bulk. With this technique, it is possible to study local residual stresses developed during manufacturing or while in service due to interactions between, for example, different phases and/or grains with different orientations in materials containing multiple or single phase(s). Such information is essential for understanding mechanical properties and designing advanced materials, but is largely non-existent in the current generation of materials models. In the present paper, the principle and experimental set-up of the 3D microdiffraction are introduced, followed by a description of a method for quantification of the local plastic deformation based on high-angular-resolution orientation maps. The quantification of local residual stresses in two model materials, ductile cast iron (two phases) and partially recrystallized pure nickel (single phase), using 3D microdiffraction will then be presented. The results show that 3D microdiffraction is important for understanding the origin of local residual stresses and to relate them to the microstructural evolution. Finally, the limitations of the 3D microdiffraction on the current generation synchrotron source and new possibilities after the synchrotron upgrade are discussed.

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Section: Microstrucure Of Partially Recrystallized Ni Processed By Acsupporting

confidence: 89%

High Resolution Mapping of Orientation and Strain Gradients in Metals by Synchrotron 3D X-ray Laue Microdiffraction

Zhang

Barabash

2019

QuBS

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“…6e). This sharp change in orientation is likely due to the presence of a high dislocation density 34 , specifically geometrically necessary dislocations (GNDs); GNDs have been shown to accumulate at grain and sub-grain boundaries 19 . Similarly, the CP-FFT model displayed a gradient feature in the equivalent von Mises plastic strain, but only when the twin boundary was instantiated (circled in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…Techniques such as diffraction contrast tomography (DCT) and HEDM can provide information on the initiation and growth mechanics of fatigue cracks; however, they currently cannot reconstruct intragranular elastic strain information 15,16 . Recent advances in X-ray diffraction experiments have allowed for the acquisition of misorientation and elastic strain via dark-field X-ray microscopy (DFXM), which probes a single set of lattice planes within a grain of interest (GOI) with high spatial and angular resolution [17][18][19][20][21] (Fig. 1b).…”

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confidence: 99%

Quantifying microscale drivers for fatigue failure via coupled synchrotron X-ray characterization and simulations

et al. 2020

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During cyclic loading, localization of intragranular deformation due to crystallographic slip acts as a precursor for crack initiation, often at coherent twin boundaries. A suite of highresolution synchrotron X-ray characterizations, coupled with a crystal plasticity simulation, was conducted on a polycrystalline nickel-based superalloy microstructure near a parent-twin boundary in order to understand the deformation localization behavior of this critical, 3D microstructural configuration. Dark-field X-ray microscopy was spatially linked to high energy X-ray diffraction microscopy and X-ray diffraction contrast tomography in order to quantify, with cutting-edge resolution, an intragranular misorientation and high elastic strain gradients near a twin boundary. These observations quantify the extreme sub-grain scale stress gradients present in polycrystalline microstructures, which often lead to fatigue failure.

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“…The mechanisms of the self-organisation is, however, mostly studied by dislocation dynamics simulations due to the lack of experimental data. New emerging synchrotron techniques [39][40][41] will in the near future provide experimental data on this scientifically intriguing self-organisation process and the dislocation interactions that lead to the technologically important work hardening of metals.…”

Section: Discussionmentioning

confidence: 99%

Analysis of Grain-Resolved Data from Three-Dimensional X-Ray Diffraction Microscopy in the Elastic and Plastic Regimes

Juul

Oddershede

Winther

2019

JOM

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Ultra-low-angle boundary networks within recrystallizing grains

Cited by 37 publications

References 12 publications

High Resolution Mapping of Orientation and Strain Gradients in Metals by Synchrotron 3D X-ray Laue Microdiffraction

High Resolution Mapping of Orientation and Strain Gradients in Metals by Synchrotron 3D X-ray Laue Microdiffraction

Quantifying microscale drivers for fatigue failure via coupled synchrotron X-ray characterization and simulations

Analysis of Grain-Resolved Data from Three-Dimensional X-Ray Diffraction Microscopy in the Elastic and Plastic Regimes

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