Geometrically Necessary Dislocations on Plastic Deformation of Polycrystalline TRIP Steel [PDF]
Crystals, 2019 In this study, the main deformation behavior in terms of geometrically necessary dislocations (GND) was investigated on a transformation induced plasticity (TRIP) stainless steel by using sharp indentation at nanometric length scale. Results evidence that austenitic grains display an isotropic behavior on terms of GND, the main deformation mechanism ...
Roa Rovira, Joan Josep +4 more
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Diffuse-interface polycrystal plasticity: expressing grain boundaries as geometrically necessary dislocations [PDF]
Materials Theory, 2017 The standard way of modeling plasticity in polycrystals is by using the crystal plasticity model for single crystals in each grain, and imposing suitable traction and slip boundary conditions across grain boundaries. In this fashion, the system is modeled as a collection of boundary-value problems with matching boundary conditions.
Nikhil Chandra Admal +2 more
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Resolving geometrically necessary dislocation density onto individual dislocation types using EBSD-based continuum dislocation microscopy [PDF]
International Journal of Plasticity, 2016 Abstract Modeling of plasticity is often hampered by the difficulty in accurately characterizing dislocation density on the microscale for real samples. It is particularly difficult to resolve measured dislocation content onto individual dislocation types at the length scales most commonly of interest in plasticity studies.
T.J. Ruggles, D.T. Fullwood, J.W. Kysar
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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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Microhardness model based on geometrically necessary dislocations for heterogeneous material
Journal of Materials Research and Technology, 2021 Lamellar cast irons are known as heterogeneous materials. Their overall hardness is determined by the microhardness of their microstructure contents. This study pertains to extend the indentation size effect (ISE) analyses to these heterogeneous materials.
Mohammed Mendas +3 more
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Using coupled micropillar compression and micro-Laue diffraction to investigate deformation mechanisms in a complex metallic alloy Al13Co4 [PDF]
, 2016 In this investigation, we have used in-situ micro-Laue diffraction combined with micropillar compression of focused ion beam milled Al13Co4 complex metallic alloy to study the evolution of deformation in Al13Co4.
Ayan Bhowmik +10 more
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Size-dependent geometrically necessary dislocation structures in single-crystalline tungsten
Journal of Materials Research, 2022 Abstract Wedge indentation experiments were conducted to study the depth dependence of geometrically necessary dislocation (GND) structures in single-crystalline tungsten. Single-crystalline tungsten exhibits a pronounced indentation size effect (ISE), which can be rationalized based on GNDs. The dislocation mechanisms,
Jin Wang +4 more
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The influence of indenter tip rounding on the indentation size effect [PDF]
, 2010 A model was developed to interpret the indentation size effect. The model considers the tip wear effect, causing a rounded tip, the plastic zone size and various strengthening contributions, including geometrically necessary dislocations, preexisting ...
Gao, Nong +2 more
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The role of geometrically necessary dislocations in giving material strengthening [PDF]
Scripta Materialia, 2003 The role of geometrically necessary dislocations in providing macroscopic strengthening is reviewed with particle reinforcement as an examp le. The general relation between the Nye tensor and slipalong a curvilinear slipline net is derived to emphasise the importance of curvature of slip lines upon the rate of dislocation storage.
N.A Fleck, M.F Ashby, J.W Hutchinson
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Materials Research Letters, 2019 This paper reports on a heterogeneous-structured β-Ti alloy with an exceptional combination of high strength and ductility, resulting from optimized hierarchical features in a lamellar microstructure.
Sumin Shin +3 more
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