Results 1 to 10 of about 5,655,416 (266)
Mechanical Engineering Journal, 2018 In this study, we investigated the mechanism of the indentation size effect based on measurement of the geometrically necessary (GN) dislocation density. The GN dislocation density was measured around impressions by electron backscatter diffraction (EBSD)
Shota HASUNUMA +3 more
doaj +6 more sources
Journal of Materials Research and TechnologyThis study presents a comprehensive analysis of time evolution and spatial distribution of crystallographic geometrically necessary dislocation (GND) density induced by solid-state thermal cycling in an IN718 polycrystal.
Anderson Nascimento, Irene J. Beyerlein
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Quantifying geometrically necessary dislocation density during hot deformation in AA6082 Al alloy [PDF]
Materials Science and Engineering: A, 2021 Physically based constitutive equations incorporating the key microstructural mechanisms e.g. dislocations, grain size, etc, have been used widely to predict the stress-strain behaviour of alloys at plastic and viscoplastic conditions. This enables an accurate prediction of the formed geometry as well as the final underlying microstructures.
Jing-Hua Zheng +4 more
core +7 more sources
Crystal plasticity analysis of micro-deformation, lattice rotation and geometrically necessary dislocation density [PDF]
Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences, 2012 A gradient-enhanced crystal plasticity model is presented that explicitly accounts for the evolution of the densities of geometrically necessary dislocations (GNDs) on individual slip systems of deforming crystals. The GND densities are fully coupled with the crystal slip rule.
Angus J Wilkinson
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European Journal of Mechanics, A/SolidsTwo methods for the calculation of geometrically necessary dislocation (GND) density within planar discrete dislocation plasticity (DDP) are studied. In particular, by calculating explicitly the Nye tensor and by constructing a Burgers circuit, the GND density in single and oligocrystals is determined.
Yinguang Piao
exaly +2 more sources
Graded Brittle–Ductile Transition via Laser-Induced Thermal Gradient for Broaching of Z10C13 Steel [PDF]
MicromachinesThis paper presents a breakthrough in activating the skin effect at conventional broaching speeds (1–8 m/min) by using laser defocus gradient modification to induce surface embrittlement in martensitic stainless steel Z10C13.
Guozhen Liu +6 more
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Ultramicroscopy, 2013 Recent advances using cross-correlation analysis of full resolution high quality electron backscatter diffraction (EBSD) patterns have provided a method for quantitatively mapping the stored dislocation density at high spatial resolution. Larger areas could be mapped with image binning or coarser step sizes. We have studied the effects of image binning
Angus J Wilkinson +2 more
exaly +4 more sources
Journal of Materials Research and Technology, 2023 High-density dislocations and nano-twinning are known to significantly influence the work hardening ability of materials, presenting a potent approach for enhancing their overall strength.
Fei Chen +4 more
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Materials Research, 2021 In this paper, the relationship between Kernel average misorientation (KAM), geometrically necessary dislocation (GND) density and dislocation structures of Nb-bearing austenitic stainless steel under low cycle fatigue (LCF) was studied at 600°C at the ...
Liangwei Fang +7 more
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Strain-gradient effect on the crack tip dislocations density
Fracture and Structural Integrity, 2020 In this study, the influence of a material’s plastic properties on the crack tip fields and dislocation density behavior is analytically and numerically analyzed using the conventional mechanism-based strain-gradient plasticity (CMSGP) theory established
Valery Shlyannikov +2 more
doaj +3 more sources