Results 261 to 270 of about 52,903 (306)
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Microscopy and Microanalysis, 2019
During recrystallization, the growth of fresh grains initiated within a deformed microstructure causes dramatic changes in the dislocation structure and density of a heavily deformed matrix.
M. Seyed Salehi +2 more
semanticscholar +1 more source
During recrystallization, the growth of fresh grains initiated within a deformed microstructure causes dramatic changes in the dislocation structure and density of a heavily deformed matrix.
M. Seyed Salehi +2 more
semanticscholar +1 more source
Acta Materialia, 2006
A dislocation density based constitutive model for face-centred cubic crystals is introduced and implemented into a crystal plasticity finite element framework. The approach assumes a homogeneous dislocation structure and tracks the dislocation evolution on each slip system.
Ma, A., Roters, F., Raabe, D.
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A dislocation density based constitutive model for face-centred cubic crystals is introduced and implemented into a crystal plasticity finite element framework. The approach assumes a homogeneous dislocation structure and tracks the dislocation evolution on each slip system.
Ma, A., Roters, F., Raabe, D.
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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 +2 more
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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 +2 more
openaire +1 more source
Higher-Order Stress due to Self Energy of Geometrically Necessary Dislocations
Key Engineering Materials, 2007The self energy of geometrically necessary dislocations (GNDs) in single crystals is considered to inevitably introduce a higher-order stress as the work conjugate to slip gradient. It is pointed out that this higher-order stress changes stepwise in response to in-plane slip gradient and thus explicitly influences the initial yielding of polycrystals ...
Nobutada Ohno, Dai Okumura
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Geometrically necessary dislocation fingerprints of dislocation loop absorption at grain boundaries
Physical Review Materials, 2022Larissa M. Woryk +7 more
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Determining Burgers vectors and geometrically necessary dislocation densities from atomistic data
Modelling and Simulation in Materials Science and Engineering, 2010We 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
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Strain-Hardening Model of Dual-Phase Steel With Geometrically Necessary Dislocations
Journal of Engineering Materials and Technology, 2018The strain-hardening behavior of metal during the uniaxial tension can be treated as the competing result of generation and annihilation of statistically stored dislocations (SSDs). Geometrically necessary dislocations (GNDs) are generated to accommodate a lattice mismatch and maintain deformation compatibility in dual-phase (DP) steels because of the ...
Chuang Ren, W. Dan, Y. Xu, W. Zhang
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Experimentally determined content of a geometrically necessary dislocation boundary in copper
Acta Materialia, 2004Abstract Weak beam and stereo transmission electron microscopy (TEM) were used to analyze the dislocation content of a crystallographic geometrically necessary dislocation boundary (GNB) in rolled copper. The GNB is oriented close to the ( 1 1 1) slip plane and is composed primarily of dislocations from the three highest stressed slip ...
Rodney J McCabe +2 more
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Identification of geometrically necessary dislocations in solid phase crystallized poly-Si
Journal of Applied Physics, 2013In this work, the presence of geometrically necessary dislocations (GNDs) in polycrystalline silicon (poly-Si) thin films was detected, suggesting that plastic deformation occurs during the solid phase crystallization (SPC) process of amorphous silicon (a-Si:H).
Law, F. +5 more
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