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

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

研究成果: Article査読

24 被引用数 (Scopus)

抄録

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.

本文言語English
ページ(範囲)13-28
ページ数16
ジャーナルInternational Journal of Plasticity
47
DOI
出版ステータスPublished - 2013 8

ASJC Scopus subject areas

  • 材料科学(全般)
  • 材料力学
  • 機械工学

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