Modeling and simulation on ultrafine-graining based on multiscale crystal plasticity considering dislocation patterning

Y. Aoyagi, R. Kobayashi, Y. Kaji, Kazuyuki Shizawa

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

Ultrafine-grained metals whose grain size is less than one micron have attracted interest as high strength materials. However, a mechanism of ultrafine-graining based on evolution of dislocation structures has not been clarified. In this study, we derive reaction-diffusion equations for dislocation patterning of dislocation cell structures and subgrains. In order to express the generation of dislocation pattern responding to deformation progress, information of slip rate and stress and effect of interactions between slip systems on formation of cell structures are introduced into the reaction rate coefficients of reaction-diffusion equations. Moreover, we propose a multiscale crystal plasticity model based on dislocation patterning. Then we carry out pseudo-three-dimensional FE-FD hybrid simulation for severe compression of FCC polycrystal using the present model. Some processes of ultrafine-graining, i.e., generation of dislocation cell structures, subgrains, dense dislocation walls and lamella subdivisions with high angle boundaries are numerically reproduced, and we investigate the effect of dislocation behavior on the processes of ultrafine-graining.

Original languageEnglish
Pages (from-to)13-28
Number of pages16
JournalInternational Journal of Plasticity
Volume47
DOIs
Publication statusPublished - 2013 Aug

Fingerprint

Dislocations (crystals)
Plasticity
Crystals
Polycrystals
Reaction rates
Compaction
Cells
Metals
Ultrafine

Keywords

  • A. Dislocations
  • A. Microstructures
  • B. Crystal plasticity
  • B. Metallic material
  • Ultrafine-grained metal

ASJC Scopus subject areas

  • Mechanical Engineering
  • Mechanics of Materials
  • Materials Science(all)

Cite this

Modeling and simulation on ultrafine-graining based on multiscale crystal plasticity considering dislocation patterning. / Aoyagi, Y.; Kobayashi, R.; Kaji, Y.; Shizawa, Kazuyuki.

In: International Journal of Plasticity, Vol. 47, 08.2013, p. 13-28.

Research output: Contribution to journalArticle

@article{f9fbfef8fdcf490982e33872d3c5a201,
title = "Modeling and simulation on ultrafine-graining based on multiscale crystal plasticity considering dislocation patterning",
abstract = "Ultrafine-grained metals whose grain size is less than one micron have attracted interest as high strength materials. However, a mechanism of ultrafine-graining based on evolution of dislocation structures has not been clarified. In this study, we derive reaction-diffusion equations for dislocation patterning of dislocation cell structures and subgrains. In order to express the generation of dislocation pattern responding to deformation progress, information of slip rate and stress and effect of interactions between slip systems on formation of cell structures are introduced into the reaction rate coefficients of reaction-diffusion equations. Moreover, we propose a multiscale crystal plasticity model based on dislocation patterning. Then we carry out pseudo-three-dimensional FE-FD hybrid simulation for severe compression of FCC polycrystal using the present model. Some processes of ultrafine-graining, i.e., generation of dislocation cell structures, subgrains, dense dislocation walls and lamella subdivisions with high angle boundaries are numerically reproduced, and we investigate the effect of dislocation behavior on the processes of ultrafine-graining.",
keywords = "A. Dislocations, A. Microstructures, B. Crystal plasticity, B. Metallic material, Ultrafine-grained metal",
author = "Y. Aoyagi and R. Kobayashi and Y. Kaji and Kazuyuki Shizawa",
year = "2013",
month = "8",
doi = "10.1016/j.ijplas.2012.12.007",
language = "English",
volume = "47",
pages = "13--28",
journal = "International Journal of Plasticity",
issn = "0749-6419",
publisher = "Elsevier Limited",

}

TY - JOUR

T1 - Modeling and simulation on ultrafine-graining based on multiscale crystal plasticity considering dislocation patterning

AU - Aoyagi, Y.

AU - Kobayashi, R.

AU - Kaji, Y.

AU - Shizawa, Kazuyuki

PY - 2013/8

Y1 - 2013/8

N2 - Ultrafine-grained metals whose grain size is less than one micron have attracted interest as high strength materials. However, a mechanism of ultrafine-graining based on evolution of dislocation structures has not been clarified. In this study, we derive reaction-diffusion equations for dislocation patterning of dislocation cell structures and subgrains. In order to express the generation of dislocation pattern responding to deformation progress, information of slip rate and stress and effect of interactions between slip systems on formation of cell structures are introduced into the reaction rate coefficients of reaction-diffusion equations. Moreover, we propose a multiscale crystal plasticity model based on dislocation patterning. Then we carry out pseudo-three-dimensional FE-FD hybrid simulation for severe compression of FCC polycrystal using the present model. Some processes of ultrafine-graining, i.e., generation of dislocation cell structures, subgrains, dense dislocation walls and lamella subdivisions with high angle boundaries are numerically reproduced, and we investigate the effect of dislocation behavior on the processes of ultrafine-graining.

AB - Ultrafine-grained metals whose grain size is less than one micron have attracted interest as high strength materials. However, a mechanism of ultrafine-graining based on evolution of dislocation structures has not been clarified. In this study, we derive reaction-diffusion equations for dislocation patterning of dislocation cell structures and subgrains. In order to express the generation of dislocation pattern responding to deformation progress, information of slip rate and stress and effect of interactions between slip systems on formation of cell structures are introduced into the reaction rate coefficients of reaction-diffusion equations. Moreover, we propose a multiscale crystal plasticity model based on dislocation patterning. Then we carry out pseudo-three-dimensional FE-FD hybrid simulation for severe compression of FCC polycrystal using the present model. Some processes of ultrafine-graining, i.e., generation of dislocation cell structures, subgrains, dense dislocation walls and lamella subdivisions with high angle boundaries are numerically reproduced, and we investigate the effect of dislocation behavior on the processes of ultrafine-graining.

KW - A. Dislocations

KW - A. Microstructures

KW - B. Crystal plasticity

KW - B. Metallic material

KW - Ultrafine-grained metal

UR - http://www.scopus.com/inward/record.url?scp=84879109972&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84879109972&partnerID=8YFLogxK

U2 - 10.1016/j.ijplas.2012.12.007

DO - 10.1016/j.ijplas.2012.12.007

M3 - Article

VL - 47

SP - 13

EP - 28

JO - International Journal of Plasticity

JF - International Journal of Plasticity

SN - 0749-6419

ER -