Analysis of the deformation mechanisms in bulk ultrafine grained metallic materials

Alexandrov, Igor; Chembarisova, R. G.; Ситдиков, В. Д.

doi:10.1016/j.msea.2006.07.155

Cited by 9 publications

(6 citation statements)

References 19 publications

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“…This trend is similar to that reported in previous investigations. 4,25 According to the model, the self-diffusion activation energy and the SFE are two important parameters influencing the dislocation density and therefore subgrain size. Decreasing SFE leads to a higher dislocation dissociation into partials.…”

Section: Resultsmentioning

confidence: 99%

“…2 In contrast to the conventional metal forming processes such as rolling, forging and extrusion, SPD implies large plastic deformations. 3,4 The principle of SPD includes increasing the dislocation density by intensively deforming the materials through successive passes of deformation. 5 It has been shown that during severe deformation, the dislocations are distributed non-uniformly.…”

Section: Introductionmentioning

confidence: 99%

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Two-internal variable thermodynamics modelling of severe plastic deformation: Dislocation and flow stress evolutions

Parvin

Kazeminezhad

2015

Materials Science and Technology

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Two-internal variable thermodynamics model is presented to investigate the evolution of microstructure and flow stress during severe plastic deformation. Previous studies have shown that due to heterogeneous distribution of dislocations during severe plastic deformation, the use of multivariable models is needed. In this regard, a two-internal variable model is presented. In the present paper, the dislocation densities in the subgrain boundaries and interiors are considered as internal variables. The model uses general laws of thermodynamics and describes the evolution of the dislocation densities on the basis of parameters such as the self-diffusion activation energy and the stacking fault energy. The model predicts the dislocation density, subgrain size and strength. To verify the model, the achieved results are compared with the experimental data.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Two-internal variable thermodynamics modelling of severe plastic deformation: Dislocation and flow stress evolutions

Parvin

Kazeminezhad

2015

Materials Science and Technology

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“…It has also been reported that in nanocrystalline metals changing the strain rate changes the ductility [2]- [7]. Numerical simulations of deformation and rate independent failure in nanocrystalline materials have been performed in the recent past [19]- [23]. Siddiq and El Sayed [1] presented rate independent constitutive model for intergranular failure in nanocrystalline materials by considering void growth and coalescence in the grain boundary region.…”

Section: Introductionmentioning

confidence: 99%

A multiscale phenomenological constitutive model for strain rate dependent tensile ductility in nanocrystalline metals

Siddiq

Sayed²

2015

Materials Letters

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A variational multiscale constitutive model that accounts for strain rate dependent ductility of nanocrystalline materials during intergranular failure has been presented. The presented model is an extension of the previous work [1], in which a nanocrystalline material is modelled as two-phase with grain interior being modelled using crystal plasticity theory while grain boundary affected zone using porous plasticity model which accounts for ductile damage due to void growth and coalescence. The model capability of capturing the strain rate dependent deformation and failure has been demonstrated through validations against uniaxial test data taken from literature. The validated results show a good agreement between experimental and simulated response.

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“…In connection with this, the analysis of the texture formation processes at this level is essential to understand the objective laws of nanostructuring [15][16][17][18][19][20][21][22][23][24][25][26][27][28]. The kinetic modeling [29,30] is among the methods, which are used to study the SPD processes as well [32][33][34][35][36]. It is devoted to finding out the reasons of the deformation straining, the evolution of the grain size, dislocation density (total, in cell-grain interior, in cell-grain boundaries) and vacancy concentration depending on the SPD conditions.…”

Section: Introductionmentioning

confidence: 99%

“…In recent years in our laboratories in cooperation with the scientists from some Russian and foreign universities and scientific institutions a number of investigations, related to the multiscale computer modeling of the processes attending ECAP, have been performed on the example of pure Cu and Ti [1,[8][9][10][11]14,22,[33][34][35][36][37][38][39]. The peculiarity of that modeling is regarding the interconnection between the processes, attending ECAP at different scale levels.…”

Section: Introductionmentioning

confidence: 99%

Multiscale Modeling of SPD Processes for Grain Refinement

Alexandrov

2008

MSF

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The results of a recent multiscale computer modeling are presented in this report. The conducted investigations are devoted to the processes, which take place in different metallic materials subjected to severe plastic deformation (SPD). It is presented that the developed models and approaches can be useful in the successful prediction and comprehensive analysis of the peculiarities of material flow and the ways of its homogenization, the understanding of principles of grain structure refinement, the achievement of given grain morphology, grain boundary misorientation spectrum and crystallographic texture, as well as in the evaluation of the active deformation mechanisms, estimating the level of structure-sensitive properties, etc. It is shown that multiscale modeling is a very promising approach which could supply the researchers with the possibility to take into account the complex influence of the different parameters, related to SPD processing and material in order to refine the grain size and obtain homogeneous bulk nanostructured materials.

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Analysis of the deformation mechanisms in bulk ultrafine grained metallic materials

Cited by 9 publications

References 19 publications

Two-internal variable thermodynamics modelling of severe plastic deformation: Dislocation and flow stress evolutions

Two-internal variable thermodynamics modelling of severe plastic deformation: Dislocation and flow stress evolutions

A multiscale phenomenological constitutive model for strain rate dependent tensile ductility in nanocrystalline metals

Multiscale Modeling of SPD Processes for Grain Refinement

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