TEM Identification of Disclinations in Plastically Deformed Crystals

Klemm, V.; Klimanek, P.; Motylenko, Mykhailo

doi:10.4028/www.scientific.net/ssp.87.57

Cited by 13 publications

(4 citation statements)

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“…in [4,5], and in this connection the misorientations occurring in disclination arrangements were derived from the local displacements of the Kikuchi patterns [6,7]. In order to identify a disclination the measurement of a set of local orientations around the defect is necessary.…”

Section: Introductionmentioning

confidence: 99%

Characterization of the cell block structure and disclination configurations in plastically deformed metals by electron diffraction

Motylenko¹,

Klemm²,

Klimanek³

et al. 2004

Journal of Alloys and Compounds

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Section: Introductionmentioning

confidence: 99%

Characterization of the cell block structure and disclination configurations in plastically deformed metals by electron diffraction

Motylenko¹,

Klemm²,

Klimanek³

et al. 2004

Journal of Alloys and Compounds

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“…Also, note that disclination dipoles were experimentally observed by high resolution transmission electron microscopy (HRTEM) in iron under ball-mill treatment resulting in the nanostructure formation [31]. Besides, disclinations, their dipoles and other disclination configurations at grain boundaries were experimentally identified by various techniques in deformed coarse-grained polycrystals; see reviews [32,33] and references therein.…”

Section: Interfacial Sliding In Nanocrystalline Films Basic Featuresmentioning

confidence: 99%

“…Besides, disclinations, their dipoles and other disclination configurations at grain boundaries were experimentally identified by various techniques in deformed coarse-grained polycrystals; see reviews [32,33] and references therein.…”

Section: Interfacial Sliding In Nanocrystalline Films Basic Featuresmentioning

confidence: 99%

Stress relaxation through interfacial sliding in nanocrystalline films

Скиба¹,

Ovid’ko²,

Sheĭnerman³

2008

J. Phys.: Condens. Matter

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A special mechanism of stress relaxation in nanocrystalline films is suggested and theoretically described. The mechanism represents the interfacial sliding accompanied by the formation of wedge disclination dipoles at grain boundaries in nanocrystalline films. The wedge disclination dipoles release, in part, mismatch stresses generated at film-substrate boundaries. It is theoretically shown that the special relaxation mechanism is energetically favorable in various nanocrystalline films deposited onto single crystalline substrates (in particular, AlN/6H-SiC, GaN/6H-SiC, 3C-SiC/Si and Ni/Cu film/substrate systems) in wide ranges of their parameters.

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“…The misorientation band representing the new disclination configuration is characterized by the parameters given in the figure. TEM observations have demonstrated that microbands are frequently found in plastically deformed crystals and are important defect entities in the substructure evolution at large strain (Klimanek et al, 2001;Klemm et al, 2002).…”

Section: Formation Mechanisms Of Disclinations In Solidsmentioning

confidence: 99%

Mechanics of disclinated interfaces and cracks in polycrystalline an nanocrystalline materials

Zhou¹

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Gain boundaries (GBs) and crystal lattices in nanocrystalline materials contain defects, which may grow and induce failure of the materials. A critical issue for developing nanocrystalline materials is thus the modeling of material microstructures and constituent defects as well as the simulation of their behavior under load. In particular, the disclination defect, commonly found in nanocrystalline materials, is investigated in this research. The research focuses on the description of material interfaces by a disclination dipole wall and on the investigation of cracks initiating from disclinations. First, the mechanics model of an interfacial wedge disclination dipole wall in a hexagonal bicrystal is established by the method of image dislocations. The exact closed-form solutions for the elastic stress and strain energy density are shown to be of the form of the logarithm of hyperbolic and trigonometric functions of complex parameters. The results show that the stress, strain energy density and strain energy all depend significantly on the orientational and material inhomogeneities. Second, the disclination-structural unit model in conjunction with the mechanics model of the dipole wall is developed for the physical description of GBs in hexagonal bicrystals. For [1100] symmetrical tilt GBs in cobalt and titanium, it is shown that the GB stress field and energy depend strongly on the misorientation. In particular, the GB stress field is more localized in high-angle boundaries than in small-angle boundaries and severe distortion of the stress field results from even a small inhomogeneity. The energy-misorientation curve is characterized by cusps associated with favored 1

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TEM Identification of Disclinations in Plastically Deformed Crystals

Cited by 13 publications

References 0 publications

Characterization of the cell block structure and disclination configurations in plastically deformed metals by electron diffraction

Characterization of the cell block structure and disclination configurations in plastically deformed metals by electron diffraction

Stress relaxation through interfacial sliding in nanocrystalline films

Mechanics of disclinated interfaces and cracks in polycrystalline an nanocrystalline materials

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