Conditions of Strain-Induced Facet Formation during Interaction between a Lattice Dislocation Pile-Up and a Grain Boundary

Перевезенцев, В. Н.; Kirikov, S. V.; Svirina, Yu. V.

doi:10.1134/s0031918x20100087

Cited by 5 publications

(3 citation statements)

References 15 publications

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“…These studies illustrate the ongoing scientific interest in the topic but do not alter the general conclusions on the role of DPUs in relationship to the GSE. The interaction between a pileup and a disclination was studied by Rybin et al (2018) and Perevezentsev et al (2020). These simplified models incorporate the strain-induced GB-deformation which was studied with an advanced multiscale model by Peng et al (2022).…”

Section: Theoretical Analysis Of Dpusmentioning

confidence: 99%

Dislocation pileups in small grains

Schouwenaars

Kestens

2023

International Journal of Plasticity

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Section: Theoretical Analysis Of Dpusmentioning

confidence: 99%

Dislocation pileups in small grains

Schouwenaars

Kestens

2023

International Journal of Plasticity

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“…A dislocation-type concentrator is a dislocation that takes place at the junction of grain boundaries. The junction dislocation is an analogue of the lattice dislocation, but it is considered not as a part of the crystal lattice of an individual grain, but in conditional (virtual) constructs: the lattice of grain boundary shifts, the complete lattice of overlaps, and the lattice of coincident nodes of crystal grains forming the junction [41], [42]. Such concentrators play a defining role in the further evolution of the polycrystal, being responsible for local accommodation processes.…”

Section: Problem Statementmentioning

confidence: 99%

Nanopore Formation at the Junctions of the Polycrystal Intergranular Boundary Under Plastic Deformation

Suchikova,

Kovachov,

Lazarenko

et al. 2023

Latvian Journal of Physics and Technical Sciences

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The article is devoted to the study of the mechanism of nanopore formation in the junctions of polycrystal grains under the plastic deformation of a polycrystal due to the conservative sliding of lattice dislocations. A mechanism for the formation of a stress concentrator at the junction of the polycrystal grain boundaries is proposed. The possibility of relaxation of the stress state due to the formation of a junction nanopore is considered in the paper.

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“…В результате вдоль «ножевой» границы возникает цепочка дисклинаций одного знака, расположенных в точках ее ветвления. Теоретически условия появления трещин вблизи дисклинаций рассматривались в публикациях [7][8][9][10][11][12][13][14][15][16]. Дисклинационные модели разрушения применительно к деформации мелкозернистых материалов рассматривались в [17][18][19].…”

Section: Introductionunclassified

Crack Initiation at Grain Boundary With a Variable Misorientation Vector

Perevezentsev,

Kirikov

2023

PSP

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A model is proposed for the initiation of cracks at “knife” grain boundaries, i.e., rectilinear, broken boundaries of deformation origin, oriented along the tension axis, arising as a result of rotational incompatibility in the form of a disclination dump at the stage of pre-fracture of the material. The disorientation of the “knife” boundary decreases down to the breaking point in the body of the grain, and its decrease (rotational instability damping) occurs not continuously, but discretely through the branching of secondary low- and high-angle boundaries. In this case, along the “knife” boundary, at the points of its branching, linear mesodefects of the rotational type arise-wedge disclinations of the same sign. A model of crack initiation in an elastic field of a chain of negative disclinations that create tensile elastic stresses is proposed. When analyzing the conditions for crack initiation, a combined criterion was used, according to which the simultaneous fulfillment of force and energy conditions was required for crack initiation. Within the framework of this model, the critical values of the total value of the Frank vector of disclinations located on the “knife” boundary and the average gradient of its misorientation are calculated, upon reaching which the criterion of crack initiation is satisfied. The dependences of these quantities on the length of the “knife” boundary and the effective screening radius of the elastic field of disclinations are calculated. It is shown that the appearance of cracks is most likely at the boundaries with the largest misorientation gradient (exceeding 8–20 deg/?m, depending on the length of the boundary).

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Conditions of Strain-Induced Facet Formation during Interaction between a Lattice Dislocation Pile-Up and a Grain Boundary

Cited by 5 publications

References 15 publications

Dislocation pileups in small grains

Dislocation pileups in small grains

Nanopore Formation at the Junctions of the Polycrystal Intergranular Boundary Under Plastic Deformation

Crack Initiation at Grain Boundary With a Variable Misorientation Vector

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