Results 11 to 20 of about 377 (207)
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
openaire +4 more sources
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
openaire +1 more source
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
openaire +2 more sources
Geometrically necessary dislocations and strain-gradient plasticity: a few critical issues [PDF]
Scripta Materialia, 2003 Abstract A few issues related to the modeling of size effects in terms of geometrically necessary dislocations (GNDs) are critically discussed, viz. strain hardening, length scale dependence, types of GND arrays. Consequences are drawn regarding the continuum modeling of size effects in plasticity.
Kubin, L. P., Mortensen, A.
openaire +1 more source
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
openaire +2 more sources
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
openaire +2 more sources
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
openaire +1 more source
Journal of Materials Research and Technology, 2023 It is urgent to explore an efficient treatment strategy to obtain characteristic microstructures for better mechanical properties of alloys in an era of energy shortage.
Yafei Wang +3 more
doaj +1 more source
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
doaj +1 more source
The Role of Geometrically Necessary Dislocations in Cantilever Beam Bending Experiments of Single Crystals [PDF]
Materials, 2017 The mechanical behavior of single crystalline, micro-sized copper is investigated in the context of cantilever beam bending experiments. Particular focus is on the role of geometrically necessary dislocations (GNDs) during bending-dominated load conditions and their impact on the characteristic bending size effect.
Husser, E., Bargmann, S.
openaire +3 more sources