Modeling of Subgrain’s Crystallographic Misorientation Distribution

Kondratev, Nikita S.; Трусов, П. В.

doi:10.1615/nanoscitechnolintj.2018027157

Cited by 4 publications

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“…The relations of the mesolevel model are supplemented by the submodel equations describing subgrain misorientations. In [ 67 , 68 ], the authors proposed a method to analyze changes in the misorientation distribution of subgrains caused by to the formation and evolution of incidental low angle dislocation boundaries. The method suggests the use of physical multilevel models of inelastic deformation of a statistical type.…”

Section: Description Of the Subgrain Orientation Evolution Using The ...mentioning

confidence: 99%

“…For the small angle boundaries, the subgrain lattice misorientation angle

is described with an appropriate degree of accuracy by the Burgers relationship [ 53 , 71 ]:

where

is the Burgers vector dislocation modulus, and

is the distance between the dislocations in the wall. The method of determining

via the internal variables of the two-level statistical model was developed [ 67 ]. To describe the subgrain rotation, we identified the edge dislocation component on the j -th facet of the boundary having the normal

with the excess density of dislocations of the same sign.…”

Section: Description Of the Subgrain Orientation Evolution Using The ...mentioning

confidence: 99%

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Subgrain Coalescence Simulation by Means of an Advanced Statistical Model of Inelastic Deformation

et al. 2022

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The development of technological methods for processing and manufacturing of functional (with a priori targeted properties) polycrystalline materials and products made of these materials still remains an acute problem. A multilevel modeling approach offers researchers the opportunity to describe inelastic deformation by applying internal variables that give an effective characterization of the material structure at different structural scale levels. High temperature plastic deformation is accompanied by these processes, which leads to a significant rearrangement of the meso- and microstructure of the material. The most substantial contribution to changing the properties of polycrystals is made by the evolution of grain and defect structures at the expense of dynamic recrystallization, which significantly depends on dynamic recovery. In this paper, we consider the problem of the coalescence of subgrains undergoing rotation during inelastic hot deformation. This process is called subgrain coalescence, and it is one of the dynamic recovery mechanisms responsible for changes in the fine subgrain structure. Under applied thermomechanical loads, the coalescence process promotes the formation of recrystallization nuclei and their subsequent growth, which can greatly change the grain structure of a polycrystal. The problem was solved in terms of the advanced statistical model of inelastic deformation, modified to describe the subgrain coalescence process. The model takes into account the local interactions between contacting structural elements (subgrains). These have to be considered so that the grain coalescence caused by a decrease in subboundary energies during their progressive merging can be adequately analyzed. For this purpose, a subgrain structure quite similar to the real structure was modeled using Laguerre polyhedra. Subgrain rotations were investigated using the developed model, which relies on the consideration of the excess density edge component of the same sign dislocations on incidental subgrain boundaries. The results of modeling of a copper polycrystal are presented, and the effects of temperature and strain rate on the subgrain coalescence process is demonstrated.

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Section: Description Of the Subgrain Orientation Evolution Using The ...mentioning

confidence: 99%

“…For the small angle boundaries, the subgrain lattice misorientation angle

is described with an appropriate degree of accuracy by the Burgers relationship [ 53 , 71 ]:

where

is the Burgers vector dislocation modulus, and

is the distance between the dislocations in the wall. The method of determining

with the excess density of dislocations of the same sign.…”

Section: Description Of the Subgrain Orientation Evolution Using The ...mentioning

confidence: 99%

Subgrain Coalescence Simulation by Means of an Advanced Statistical Model of Inelastic Deformation

et al. 2022

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“…According to (9), the value of the energy of this grain boundary was 0.225 J/m 2 . As the grains deform, they undergo rotations determined by the applied rotation model [ 83 ], and the initial special boundary becomes the high-angle grain boundary with a small number of coinciding sites. Figure 7 a illustrates the evolution of the grain boundary energy for the initial special boundary 60° [111]; at 5% deformation, the special boundary ceases to be such and its energy increases to that of the high-angle boundary.…”

Section: Resultsmentioning

confidence: 99%

“…This model is based on the evolution of the incidental low-angle boundaries due to the “trapping” of an excess density of dislocations of the same sign on these boundaries. A description of this model can be found in [ 34 , 83 , 84 ].…”

Section: Methodsmentioning

confidence: 99%

A Multilevel Physically Based Model of Recrystallization: Analysis of the Influence of Subgrain Coalescence at Grain Boundaries on the Formation of Recrystallization Nuclei in Metals

et al. 2023

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This paper considers the influence of subgrain coalescence at initial high-angle boundaries on the initiation and growth of recrystallization nuclei (subgrains) under thermomechanical treatment. With certain processing regimes, adjacent subgrains in polycrystalline materials can be assembled into clusters during coalescence. Subgrain clusters at high-angle boundaries are the preferred potential nuclei of recrystallization. Coalescence is one of the dynamic recovery mechanisms, a competing process to recrystallization. When intensive coalescence develops on both sides of the grain boundary, recrystallization slows down or even stops. The problem formulated is solved using a multilevel modeling apparatus with internal variables. Application of the statistical multilevel model modified to take into account the local interaction between crystallites makes it possible to explicitly describe dynamic recrystallization and recovery. The results of modeling the behavior of a copper sample are presented and the effects of temperature, deformation velocity and subgrain structure on the formation and growth of recrystallization nuclei at arbitrary and special grain boundaries during coalescence are analyzed.

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Determination of the grain boundary facets orientation in new recrystallized grains

Kondratev¹,

Трусов²,

Makarevich³

2018

AIP Conference Proceedings

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Modeling of Subgrain’s Crystallographic Misorientation Distribution

Cited by 4 publications

References 0 publications

Subgrain Coalescence Simulation by Means of an Advanced Statistical Model of Inelastic Deformation

Subgrain Coalescence Simulation by Means of an Advanced Statistical Model of Inelastic Deformation

A Multilevel Physically Based Model of Recrystallization: Analysis of the Influence of Subgrain Coalescence at Grain Boundaries on the Formation of Recrystallization Nuclei in Metals

Determination of the grain boundary facets orientation in new recrystallized grains

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