Results 241 to 250 of about 5,655,416 (266)

Statistically stored, geometrically necessary and grain boundary dislocation densities: microstructural representation and modelling

Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences, 2007
A unified physically based microstructural representation of f.c.c. crystalline materials has been developed and implemented to investigate the microstructural behaviour of f.c.c. crystalline aggregates under inelastic deformations. The proposed framework is based on coupling a multiple-slip crystal plasticity formulation to three distinct dislocation ...
M A Zikry
exaly   +2 more sources

Influence of plastic deformation heterogeneity on development of geometrically necessary dislocation density in dual phase steel

Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing, 2016
Abstract The present investigation examined the evolution of geometrically necessary dislocation (GND) structure following tensile deformation in a commercially produced dual phase steel, DP 590. GND measurements were made using electron back scatter diffraction (EBSD).
David Field, Amrita Kundu
exaly   +2 more sources

Estimation of geometrically necessary dislocation density from filtered EBSD data by a local linear adaptation of smoothing splines

Journal of Applied Crystallography, 2019
An implementation of smoothing splines is proposed to reduce orientation noise in electron backscatter diffraction (EBSD) data, and subsequently estimate more accurate geometrically necessary dislocation (GND) densities. The local linear adaptation of smoothing splines (LLASS) filter has two advantages over classical implementations of smoothing ...
Charbel Moussa, Marc Bernacki, Nathalie Bozzolo   +2 more
exaly   +4 more sources

Geometrically necessary dislocation density evolution as a function of microstructure and strain rate

Materials Science and Engineering: A, 2022
Abstract The role of microstructure and strain rate on the development of geometrically necessary dislocation (GND) density in polycrystalline copper subjected to compression is assessed via crystal plasticity modelling and electron microscopy. Micropolar crystal plasticity finite element (MP-CPFE) simulations show that GND density is strongly ...
Daniel L. Foley, Marat I. Latypov, Xingyuan Zhao, Jonathan Hestroffer, Irene J. Beyerlein, Leslie E. Lamberson, Mitra L. Taheri   +6 more
openaire   +1 more source

Revealing the Geometrically Necessary Dislocation Density Evolution during Hot Compression of AA7050

Key Engineering Materials, 2022
Dislocations play a critical role in metal forming processes, and accurate values of dislocation density are important in modelling these processes. However, direct determination of the dislocation density is challenging. In this study, electron backscatter diffraction is used to estimate the evolution of geometrically necessary dislocation density as ...
Shuai Jiang, Victoria A. Yardley, Ning Li, Bin Gu, Yi Bo Li, Yao Qiong Liu, Zhusheng Shi   +6 more
openaire   +1 more source

Crystallographic aspects of geometrically-necessary and statistically-stored dislocation density

Acta Materialia, 1999
Abstract Classical plasticity has reached its limit in describing crystalline material behavior at the micron level and below. Its inability to predict size-dependent effects at this length scale has motivated the use of higher-order gradients to model material behavior at the micron level.
A Arsenlis, D.M Parks
openaire   +1 more source

Quantitative Study of Residual Strain and Geometrically Necessary Dislocation Density Using HR-EBSD Method

Experimental Mechanics, 2021
Optical metrology is widely used to measure materials’ deformation and mechanical properties but current fundamental research requires more precise measurement of microstructure and deformation in internal materials. Electron backscattered diffraction (EBSD) technique measures crystal orientation in individual grain and high resolution EBSD (HR-EBSD ...
C. Zhao, X. Li
openaire   +1 more source

Analytical Prediction of Geometrically Necessary Dislocation Density during Plane Strain Microbending

Key Engineering Materials, 2016
As components with proportional feature and tooling sizes are miniaturized, strain gradients through the cross-section increase. This causes strain gradient hardening as the density of geometrically necessary dislocations increases. This will lead to higher required forces in the process than expected.
Li Jie Wang, Brad L. Kinsey, Sunal Parasiz   +2 more
openaire   +1 more source

Determining Burgers vectors and geometrically necessary dislocation densities from atomistic data

Modelling and Simulation in Materials Science and Engineering, 2010
We describe a novel analysis method to quantify the Burgers vectors of dislocations in atomistic ensembles and to calculate densities of geometrically necessary and statistically stored dislocations. This is accomplished by combining geometrical methods to determine dislocation cores and the slip vector analysis, which yields the relative slip of the ...
Jun Hua, Alexander Hartmaier
openaire   +1 more source

Revealing geometrically necessary dislocation density from electron backscatter patterns via multi-modal deep learning

Ultramicroscopy, 2022
The characterization of geometrically necessary dislocation (GND) is central to understanding the plastic deformation in materials. Currently, fast and accurate determination of GND density via Electron Backscatter Diffraction (EBSD) remains a challenge.
Qi Lu, Jiayi Wu, Shilong Liu, Shiqi Zhang, Xiaorong Cai, Wei Li, Jun Jiang, Xuejun Jin   +7 more
openaire   +2 more sources