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A Predictive model for transferability of plastic deformation through grain boundaries

粒界を通じた塑性変形の移動に関する予測モデル

都留 智仁   ; 渋谷 陽二*; 廣内 智之*

Tsuru, Tomohito; Shibutani, Yoji*; Hirouchi, Tomoyuki*

多結晶材料の強度は粒径によって予測され、降伏応力は粒界を通じたすべり移動によって支配される。それゆえ、粒界での転位の移動度は塑性変形の過程において、粒界と転位の相互作用とともに重要な要素となる。本研究では、粒の結晶学的方位と負荷応力を考慮した粒界での転位の移動度について新たな基準として$$L'$$値を提案した。そして、原子シミュレーションによる双結晶の解析を行い、基準の妥当性を検証した。

The material strengths of polycrystalline metals have been widely predicted according to the grain size, where yield stress is governed by slip transfer through the grain boundary (GB). The transferability of a dislocation across a GB is enormously important in the deformation process as well as the interaction between a dislocation and GB. This paper proposes a new criterion for the transferability of dislocations through a GB that considers both the intergranular crystallographic orientation of slip systems and the applied stress condition. Atomistic simulations were carried out to investigate the slip transfer event of simple bicrystals composed of $$Sigma 3 (bar{1}12)$$ GB than $$Sigma 3 (bar{1}11)$$ GBs under uniaxial deformation and to illustrate the availability of this criterion. As a result, in contrast to the predictions of conventional criteria such as the $$M$$-value, dislocations propagated more easily across the $$Sigma 3 (bar{1}11)$$ and $$Sigma 3 (bar{1}12)$$ GB under given stress states, reflecting a larger $$L'$$-value of $$Sigma 3$$ bicrystal associated with higher transferability.

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パーセンタイル:41.71

分野:Nanoscience & Nanotechnology

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