Results 251 to 260 of about 9,231 (286)

Higher-Order Stress due to Self Energy of Geometrically Necessary Dislocations

Key Engineering Materials, 2007
The 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, 2022
Larissa M. Woryk, Sicong He, Emily M. Hopkins, Chang-Yu Hung, Jian Han, David J. Srolovitz, Jaime Marian, Mitra L. Taheri   +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, 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
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Experimentally determined content of a geometrically necessary dislocation boundary in copper

Acta Materialia, 2004
Abstract 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, Amit Misra, Terence E Mitchell   +2 more
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Identification of geometrically necessary dislocations in solid phase crystallized poly-Si

Journal of Applied Physics, 2013
In 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., Yi, Y., Hidayat, Widenborg, P.I., Luther, J., Hoex, B.   +5 more
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Geometrically necessary dislocations in FCC polycrystalline metallic materials on the mesoscale

Bulletin of the Russian Academy of Sciences: Physics, 2011
The dislocation structure of deformed copper alloys doped with Mn and Al was determined by selected area diffraction (SAD), performed using a transmission electron microscope. The scalar dislocation density, the density of geometrically necessary dislocations, and the density of statistically stored dislocations were measured.
E. V. Kozlov, L. I. Trishkina, T. V. Cherkasova, N. A. Koneva   +3 more
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Geometrically necessary boundaries and incidental dislocation boundaries formed during cold deformation

Scripta Metallurgica et Materialia, 1995
The evolution of microstructure during plastic deformation has recently been described in terms of grain subdivision involving the formation of rotated volume elements. These elements are ordinary dislocation cells and cell blocks where a cell block contains from one to several cells.
Qing Liu, Niels Hansen
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Strain-Hardening Model of Dual-Phase Steel With Geometrically Necessary Dislocations

Journal of Engineering Materials and Technology, 2018
The 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, Wen Jiao Dan, Yong Sheng Xu, Wei Gang Zhang   +3 more
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Strain gradients and geometrically necessary dislocations in deformed ice single crystals

Scripta Materialia, 2003
Abstract Hard X-ray diffraction experiments were performed on ice single crystals deformed in torsion. This work shows the relationship between the density of geometrically necessary dislocations and strain gradients. The torsion strain appears to be totally accommodated by geometrically necessary basal screw dislocations.
Montagnat, Maurine, Duval, Paul, Bastie, Pierre, Hamelin, Bernard   +3 more
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Geometrically necessary dislocation density measurements associated with different angles of indentations

International Journal of Plasticity, 2014
Experiments and numerical simulations of various angles of wedge indenters into face-centered cubic single crystal were performed under plane strain conditions.
C.F.O. Dahlberg, Y. Saito, M.S. Öztop, J.W. Kysar   +3 more
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