検索対象:     
報告書番号:
※ 半角英数字
 年 ~ 
 年

Atomic scale simulations of relationship between macroscopic mechanical properties and microscopic defect evolution in ultrafine-grained metals

超微細粒金属の機械特性とミクロ組織変化の原子スケールシミュレーション

都留 智仁   ; 青柳 吉輝*; 下川 智嗣*

Tsuru, Tomohito; Aoyagi, Yoshiteru*; Shimokawa, Tomotsugu*

超微細粒(UFG)金属の降伏メカニズムへの影響について原子シミュレーションによって検討を行った。機械特性とミクロな欠陥組織の影響を明らかにするため、粒径と粒内転位を変化させた多結晶原子モデルを構築し変形解析を行った結果、粒内転位は初期降伏と粒界を介した塑性変形挙動に大きな役割を果たすことがわかった。さらに、同じFCC金属でもCuは粒界から双晶の生成・成長が生じ、Alよりも早く塑性変形を開始することがわかった。

The effects of grain size and intragranular dislocation on yield mechanism and subsequent plastic deformation in ultrafine-grained (UFG) Al and Cu were investigated by large-scale atomic simulations. Polycrystalline atomic models with and without intragranular dislocation sources were used to elucidate the relationship between mechanical properties and defect texture. It is found that the intragranular dislocation plays a significant role in both incipient yield and grain boundary mediated dislocation nucleation. In addition UFG Cu yields earlier than UFG Al because partial dislocations in Cu are more likely to activate from grain boundaries, where the partial dislocation leaves deformation twin and secondary dislocation tends to move on twin boundary accompanied by the shift of twin boundary plane.

Access

:

- Accesses

InCites™

:

パーセンタイル:6.34

分野:Materials Science, Multidisciplinary

Altmetrics

:

[CLARIVATE ANALYTICS], [WEB OF SCIENCE], [HIGHLY CITED PAPER & CUP LOGO] and [HOT PAPER & FIRE LOGO] are trademarks of Clarivate Analytics, and/or its affiliated company or companies, and used herein by permission and/or license.