Fundamental role of crystal structure curvature in plasticity and strength of solids

Panin, V. E.; Панин, А. В.; Елсукова, Т. Ф.; Popkova, Yu. F.

doi:10.1134/s1029959915020010

Cited by 41 publications

(9 citation statements)

References 20 publications

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“…It is well known, that polycrystal deformation produces the internal stress fields inside its grains [1][2][3][4][5]. As a result, bend extinction contours are observed on the transmission electron microscopy (TEM) images of deformed material.…”

Section: Introductionmentioning

confidence: 85%

Deformation of face-centered cubic polycrystal and stress tensor components in grains

Kiseleva¹,

Gibert²,

Попова³

et al. 2016

AIP Conference Proceedings

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The transmission electron microscopy (TEM) has been used to indicate the contribution of stress tensorcomponents to internal stresses in deformed polycrystalline austenitic steel. TEM images of steel deformation demonstrate bend extinction contours the parameters of which allow detecting the stress tensor components (bending and torsional stresses of a crystal lattice). The diagrams are constructed for the contribution of stress tensor components to internal stresses in grains having different types of bending. The regularities are obtained for the stress distribution due to bending-torsion of a crystal latticein the deformed face centered cubic crystal system. The experiment shows that the contribution of bending and torsion stress components to the internal stresses is different during the increase of deformation. The torsion stress component always grows with the increase of deformation, while the bending stress component either grows or lowers. The growth in the torsion stress component is typical for grains with compound bending

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Section: Introductionmentioning

confidence: 85%

Deformation of face-centered cubic polycrystal and stress tensor components in grains

Kiseleva¹,

Gibert²,

Попова³

et al. 2016

AIP Conference Proceedings

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“…The intercept method [10] was used to measure the dislocation density, density of subboundaries, microbands, and microcracks. Curvature of the crystal lattice (χ) is an important parameter of the defect structure [5,9,11,12]. In the general case, χ is a second-rank tensor [13,14], which contains the components of curvature and torsion of the crystal lattice.…”

Section: Materials and Experimental Proceduresmentioning

confidence: 99%

“…The fracture of metallic materials is determined by the regularities of their deformation on different scales and structural levels [1,9]. It is important to establish the types of the substructure, the changes in their quantitative characteristics with a distance from the fracture zone, which would make it possible to estimate the strength and ductility of materials of a given class at high loads.…”

Section: Introductionmentioning

confidence: 99%

Gradient dislocation substructures at fracture of polycrystalline Cu-Mn alloys

Конева¹,

Trishkina²,

Potekaev³

2018

LoM

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The paper presents the results of transmission electron microscopic (TEM) studies on the defect substructure of alloys and its modification with an increasing distance from the fracture surface. Cu-Mn polycrystalline FCC solid solutions with Mn contents of 0.4 and 25 аt. % and the average grain size of 100 μm are studied. A test machine INSTRON is used to perform tensile deformation of Cu-Mn samples at room temperature and 2 • 10 −2 s −1 strain rate. The strain is measured, the types of the dislocation substructure (DSS) and their parameters are studied with the step of 2 • 10 −3 m in the local zones of fractured samples at different distances from the fracture surface. As a result of the experiments, the sequence of changes in the substructure with an increasing distance from the fracture surface are established. In Cu + 0.4 at. % Mn alloy the following substructural sequence is observed: micro-bands, misoriented cells, nonmisoriented cells, and dislocation tangles. Substructural change sequence in Cu + 25 at. % Mn alloy includes microbands, cell-networks with and without misorientations, dislocation pileups , and chaotic dislocation distributions. In both alloys terminated subboundaries have a high density near the fracture surface. It is observed that the substructures change gradually depending on the distance to the fracture surface. Substructures that cause the fracture of the alloys at a meso-scale level were also detected. Near the fracture surface, deformation boundaries are misoriented and characterized by a large amplitude of the lattice curvature-torsion. Misoriented cell and microband DSS are observed within the fracture area of Cu + 0.4 at. % Mn alloy. In Cu + 25 at. % Mn alloy the formation of misoriented cellnetwork DSS and microband DSS is observed. Microcracks appear both along the boundaries of misoriented substructures and grain boundaries.

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“…According to data of our recent studies on fatigue sensors behavior the image of regions with accumulated microdefects differ from non-damaged ones by brightness intensity [6,8]. This is related to the changing sensor surface relief to take place under the loading.…”

Section: Algorithm For Image Analysismentioning

confidence: 99%

“…This physical phenomenon is related to the strain incompatibility of two interfaced media and occurs in various multilevel systems: at the "surface layer -bulk material" interfaces, in "coating -substrate" compositions, in multilayered or thin film materials, at grain boundaries (triple joints) in polycrystals [4], etc. It is known that accumulation of defects in surface layers takes place under the cyclic loading that is followed by the material self-organization there that is exhibited in the form of dissipative structure and microextrusions [5][6][7]. It should be noticed that depending on the mechanical impact on the material the structure of surface damages will be varied.…”

Section: Introductionmentioning

confidence: 99%

Multi-purpose fatigue sensor. Part 2. Physical backgrounds for damages accumulation and parameters of their assessment

Karuskevich¹,

Игнатович²,

Maslak

et al. 2016

Frattura Ed Integrità Strutturale

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The characteristic informative parameters for defect detection to be used in fatigue sensors have been established. Their development is interpreted in terms of scale levels of deformation and fracture. Damage accumulation of the sensor's surface tends to exhibit the self-organization nature. It is accompanied by formation of "folded" strain-induced relief on the surface. The mechanisms of damage accumulation under cyclic deformation were analyzed with the use of the multiscale approach.

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Fundamental role of crystal structure curvature in plasticity and strength of solids

Cited by 41 publications

References 20 publications

Deformation of face-centered cubic polycrystal and stress tensor components in grains

Deformation of face-centered cubic polycrystal and stress tensor components in grains

Gradient dislocation substructures at fracture of polycrystalline Cu-Mn alloys

Multi-purpose fatigue sensor. Part 2. Physical backgrounds for damages accumulation and parameters of their assessment

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