Formation of grains and dislocation structure of geometrically necessary boundaries [PDF]
Materials Science and Engineering: A, 2015 A continuum dislocation model of formation of grains whose boundaries have a non-vanishing thickness is proposed. For a single crystal deforming in simple shear the lamellar structure of grains with thin layers containing dislocations as the geometrically necessary boundaries turns out to be energetically preferable.
Koster, Michael, Le, Khanh Chau
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Coincident electron channeling and cathodoluminescence studies of threading dislocations in GaN [PDF]
, 2014 We combine two scanning electron microscopy techniques to investigate the influence of dislocations on the light emission from nitride semiconductors.
Edwards, P. R. +11 more
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Simulation of screw dislocations in wadsleyite [PDF]
, 2010 The structure and energies of the cores of [100] and [001] screw dislocations in wadsleyite \left(\beta-Mg{_2}SiO{_4}\right) are calculated using a cluster-based combined elastic-atomistic method and a new parameterized interatomic potential model.
Walker, AM, Walker, A.M.
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The effect of length scale on the determination of geometrically necessary dislocations via EBSD continuum dislocation microscopy [PDF]
Ultramicroscopy, 2016 Electron backscatter diffraction (EBSD) dislocation microscopy is an important, emerging field in metals characterization. Currently, calculation of geometrically necessary dislocation (GND) density is problematic because it has been shown to depend on the step size of the EBSD scan used to investigate the sample.
T J, Ruggles +3 more
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Crystals, 2020 In a recent experimental study of indentation creep, the strain rate sensitivity (SRS) and activation volume v* have been noticed to be dependent on the indentation depth or loading force for face-centered cubic materials.
Xiazi Xiao, Hao Liu, Long Yu
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Discrete dislocation simulations and size dependent hardening in single slip [PDF]
, 1998 Plastic deformation in two-dimensional monophase and composite materials is studied using a discrete dislocation dynamics method. In this method, dislocations are represented by line defects in a linear elastic medium, and their interactions with ...
van der Giessen, E. +9 more
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Line-tension model for plasticity as the Gamma-limit of a nonlinear dislocation energy [PDF]
, 2012 In this paper we rigorously derive a line-tension model for plasticity as the Gamma-limit of a nonlinear mesoscopic dislocation energy, without resorting to the introduction of an ad hoc cut-off radius.
Scardia, L. +4 more
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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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Evolution of geometrically necessary dislocation density from computational dislocation dynamics
IOP Conference Series: Materials Science and Engineering, 2009 This paper presents a method for calculating GND densities in dislocation dynamics simulations. Evolution of suitably defined averages of GND density as well as maps showing the spatial nonuniform distribution of GNDs are analyzed under uniaxial loading.
P J Guruprasad, A A Benzerga
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Three dimensional structures of the geometrically necessary dislocations in matrix-inclusion systems under uniaxial tensile loading [PDF]
, 2004 Plastic slip deformation in matrix-inclusion systems, in which a cuboidal or spherical shaped inclusion is embedded in a softer matrix, are numerically analyzed by a finite element technique.
Ohashi, Tetsuya
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