Results 21 to 30 of about 1,476 (257)
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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Plasticity of crystals and interfaces: From discrete dislocations to size-dependent continuum theory [PDF]
Theoretical and Applied Mechanics, 2010 In this communication, we summarize the current advances in size-dependent continuum plasticity of crystals, specifically, the rate-independent (quasistatic) formulation, on the basis of dislocation mechanics.
Mesarovic Sinisa Đ.
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Journal of Materials Research and TechnologyIn this work, the forming mechanism of dislocation in laser powder bed fusion (LPBF) built IN738LC alloy was elucidated by studying the intrinsic relationships between the density and distribution of dislocation and the orientation and size of dendrite ...
Mingchuan Li +4 more
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Geometrically necessary dislocation density distributions in cyclically deformed Ti–6Al–4V
Acta Materialia, 2012 Abstract Cross-correlation-based electron backscattering diffraction analysis has been used to map lattice rotations in Ti–6Al–4V polycrystals deformed by load-controlled fatigue and dwell fatigue including a hold at maximum load. The lattice curvatures were used to form lower bound estimates of the geometrically necessary dislocation (GND) density ...
Littlewood, P, Wilkinson, A
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Investigation of the mechanism of the indentation size effect for titanium
Mechanical Engineering Journal, 2019 In this study, we investigated the mechanism of the indentation size effect for Ti, whose crystal structure is hexagonal close-packed. Indentation tests were performed for two types of single-crystal Ti with different crystal orientations: (0001) and ...
Shota HASUNUMA +2 more
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Advanced Modeling and Simulation in Engineering Sciences, 2020 This paper presents an application to metal matrix composites (MMCs) of an enhanced elasto-viscoplastic Fast Fourier Transform (EVP-FFT) formulation coupled with a phenomenological continuum Mesoscale Field Dislocation Mechanics (MFDM) theory.
J. Genée +4 more
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Materials & DesignIn the net-zero era, the burgeoning demands within engineering applications require materials that are not only lighter and stronger but also ductile.
Yi-Hsuan Sun +6 more
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Gradients of Strain to Increase Strength and Ductility of Magnesium Alloys
Metals, 2019 A strain gradient was produced in an AZ31B magnesium alloy through a plastic deformation of pure torsion at a torsional speed of π/2 per second. Compared with the base material and with the alloy processed by conventional severe plastic deformation,
Yao Liu, Songlin Cai
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Journal of Structural Geology, 2019 This study presents the first use of high-angular resolution electron backscatter diffraction (HR-EBSD) to quantitatively characterise geometrically necessary dislocations in quartz subgrain structures. HR-EBSD exploits cross-correlation of diffraction patterns to measure intragranular misorientations with precision on the order of 0.01° with well ...
Wallis, David +2 more
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Materials & DesignAccurate prediction of springback and reverse loading behavior in thin metal sheets requires a constitutive model that captures grain-size-dependent long-range dislocation interactions.
Gyu-Jang Sim +7 more
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