Interaction of dislocation pile-up with a low-angle tilt boundary: a discrete dislocation dynamics study

Kapoor, R.; Verdhan, Naisheel

doi:10.1080/14786435.2016.1266102

Cited by 18 publications

(3 citation statements)

References 60 publications

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“…Thus, low‐ and high‐angle intragranular boundary segments appear to have distinct crystallographic structures and may therefore form via different processes. Previous studies provide two kinematic models to explain the formation of intragranular boundaries comprising components with both low‐ and high‐angle segments: “Accumulation model” (Figure 11a), which suggests that low‐angle boundaries exert a greater attractive force on free dislocations than high‐angle boundaries (Kapoor & Verdhan, 2016). Consequently, misorientation across pre‐existing low‐angle boundaries will increase as deformation progresses and dislocations are continuously added (Wang et al., 2020).…”

Section: Discussionmentioning

confidence: 99%

“…1. "Accumulation model" (Figure 11a), which suggests that low-angle boundaries exert a greater attractive force on free dislocations than high-angle boundaries (Kapoor & Verdhan, 2016). Consequently, misorientation across pre-existing low-angle boundaries will increase as deformation progresses and dislocations are continuously added (Wang et al, 2020).…”

Section: Kinematic Models For Intragranular Boundary Developmentmentioning

confidence: 99%

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Using Misorientation and Weighted Burgers Vector Statistics to Understand Intragranular Boundary Development and Grain Boundary Formation at High Temperatures

et al. 2022

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During plastic deformation, strain weakening can be achieved, in part, via strain energy reduction associated with intragranular boundary development and grain boundary formation. Grain boundaries (in 2D) are segments between triple junctions, that connect to encircle grains; every boundary segment in the encircling loop has a high (>10°) misorientation angle. Intragranular boundaries terminate within grains or dissect grains, usually containing boundary segments with a low (<10°) misorientation angle. We analyze electron backscatter diffraction (EBSD) data from ice deformed at −30°C (Th≈ ${T}_{h}\approx $ 0.9). Misorientation and weighted Burgers vector (WBV) statistics are calculated along planar intragranular boundaries. Misorientation angles change markedly along each intragranular boundary, linking low‐ (<10°) and high‐angle (10–38°) segments that exhibit distinct misorientation axes and WBV directions. We suggest that these boundaries might be produced by the growth and intersection of individual intragranular boundary segments comprising dislocations with distinct slip systems. There is a fundamental difference between misorientation axis distributions of intragranular boundaries (misorientation axes mostly confined to ice basal plane) and grain boundaries (no preferred misorientation axis). These observations suggest during progressive subgrain rotation, intragranular boundaries remain crystallographically controlled up to large misorientation angles (>>10°). In contrast, the apparent lack of crystallographic control for grain boundaries suggests misorientation axes become randomized, likely due to the activation of additional mechanisms (such as grain boundary sliding) after grain boundary formation, linking boundary segments to encircle a grain. Our findings on ice intragranular boundary development and grain boundary formation may apply more broadly to other rock‐forming minerals (e.g., olivine, quartz).

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Section: Discussionmentioning

confidence: 99%

Section: Kinematic Models For Intragranular Boundary Developmentmentioning

confidence: 99%

Using Misorientation and Weighted Burgers Vector Statistics to Understand Intragranular Boundary Development and Grain Boundary Formation at High Temperatures

et al. 2022

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“…The crystals on both sides of the boundary are inclined toward each other, and that the grain boundaries are arranged by dislocations. When the misorientation of both sides of the grain boundary increased to a certain extent, the grain‐boundary properties change …”

Section: Discussionmentioning

confidence: 99%

An Investigation on the Strengthening Mechanism Based on Grain‐Boundary Misorientation of High‐Strength Pipeline Steel

Duan

Pan

et al. 2019

steel research int.

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The microstructure and grain-boundary misorientation of X80 high-strength pipeline steel are analyzed using the scanning electron microscope, the electron backscatter diffraction, and the transmission electron microscope, and the effect of grain-boundary orientation on slip dislocation is investigated by constructing a grain-boundary dislocation model. The results show that the anisotropy of the mechanical properties of X80 pipeline steel is related not only to grain size and microstructure type but also to grain-boundary orientation, which the obstruction effect of the high-angle grain boundary on slip dislocation is significantly greater than that of the low-angle grain boundary. The larger the orientation difference is, the more disorderly the arrangement of atoms on both sides of grain boundary is, and the more difficult it is for dislocations to slip across grain boundary, so the strengthening effect is more remarkable. Also, when the grain-boundary misorientation is greater than 15 , the strengthening effect tends to stabilize due to the influence of the interfacial superposition.

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Dislocation–grain boundary interactions in Ta: numerical, molecular dynamics, and machine learning approaches

Kedharnath,

Kapoor,

Sarkar

2023

J Mater Sci

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Interaction of dislocation pile-up with a low-angle tilt boundary: a discrete dislocation dynamics study

Cited by 18 publications

References 60 publications

Using Misorientation and Weighted Burgers Vector Statistics to Understand Intragranular Boundary Development and Grain Boundary Formation at High Temperatures

Using Misorientation and Weighted Burgers Vector Statistics to Understand Intragranular Boundary Development and Grain Boundary Formation at High Temperatures

An Investigation on the Strengthening Mechanism Based on Grain‐Boundary Misorientation of High‐Strength Pipeline Steel

Dislocation–grain boundary interactions in Ta: numerical, molecular dynamics, and machine learning approaches

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