Results 261 to 270 of about 3,300,976 (283)

Characterizing geometrically necessary dislocations using an elastic–plastic decomposition of Laplace stretch

Zeitschrift für angewandte Mathematik und Physik, 2020
The paper studies the geometric dislocation density tensor and Burgers vector using an elastic-plastic decomposition of Laplace stretch which arises from a QR decomposition of the deformation gradient and allows for direct experimental measurement. The geometric dislocation density tensor is obtained using the classical argument of failure of a Burgers
Sandipan Paul, Alan D. Freed
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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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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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Geometrically necessary dislocation density measurements at a grain boundary due to wedge indentation into an aluminum bicrystal

Journal of the Mechanics and Physics of Solids, 2017
An aluminum bicrystal with a symmetric tilt Σ43 (3 3 5)[1 1 0] coincident site lattice grain boundary was deformed plastically via wedge indentation under conditions that led to a plane strain deformation state.
J W Kysar
exaly   +2 more sources

Estimations of bulk geometrically necessary dislocation density using high resolution EBSD

Ultramicroscopy, 2013
Characterizing the content of geometrically necessary dislocations (GNDs) in crystalline materials is crucial to understanding plasticity. Electron backscatter diffraction (EBSD) effectively recovers local crystal orientation, which is used to estimate the lattice distortion, components of the Nye dislocation density tensor (α), and subsequently the ...
T J, Ruggles, D T, Fullwood
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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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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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The effect of geometrically necessary dislocations on the flow stress of deformed crystals containing a heterogeneous dislocation distribution

Materials Science and Engineering: A, 2001
Abstract In deformed crystals, long-range internal stresses develop during deformation as a consequence of the heterogeneity of the distribution of the dislocations which frequently form a cell structure. The composite model describes these internal stresses in a natural manner in terms of the elastic/plastic strain mismatch between the hard cell ...
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Resolving the geometrically necessary dislocation content by conventional electron backscattering diffraction

Scripta Materialia, 2008
From local orientation measurements on planar surfaces by means of electron backscattering diffraction, six components of the lattice curvature tensor can be identified. They allow determination of five components of the dislocation density tensor (thus two more than hitherto reported) and, additionally, one difference between two other components ...
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Effects of temperature and load on fretting fatigue induced geometrically necessary dislocation distribution in titanium alloy

Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing, 2021
Xianfeng Ma, Huiji Shi, Shao-Shi Rui
exaly