Effect of Extrinsic Grain Boundary Dislocations on Mechanical Properties of Ultrafine-Grained Metals by Molecular Dynamics Simulations
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- Shimokawa Tomotsugu
- Division of Innovative Technology and Science, Graduate School of Natural Science and Technology, Kanazawa University
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- Hiramoto Tomoyuki
- Division of Mechanical Science and Engineering, Graduate School of Natural Science and Technology, Kanazawa University
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- Kinari Toshiyasu
- Division of Innovative Technology and Science, Graduate School of Natural Science and Technology, Kanazawa University
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- Shintaku Sukenori
- Division of Innovative Technology and Science, Graduate School of Natural Science and Technology, Kanazawa University
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説明
The effect of extrinsic grain boundary dislocations (EGBDs) in nonequilibrium grain boundaries on the mechanical properties of ultrafine-grained metals is investigated by molecular dynamics simulations. Aluminum bicrystal models containing cracks and EGBDs impinged from the crack tips are prepared. First, the dependence of the local grain boundary structure on the accommodation mechanism of EGBDs, and on its stress field is studied. Then, the shielding effect of EGBDs on the emissions of dislocations from crack tips is investigated, and the effect of nonequilibrium grain boundaries on the intragranular deformation is discussed. Finally, to investigate the relationship between EGBDs and intergranular deformations, shear loading is applied to the bicrystal models. It is found that extrinsic grain boundaries function as the intergranular deformation source, and the Burgers vector components of the EGBDs lead to anisotropic grain boundary sliding.
収録刊行物
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- MATERIALS TRANSACTIONS
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MATERIALS TRANSACTIONS 50 (1), 2-10, 2009
公益社団法人 日本金属学会
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詳細情報 詳細情報について
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- CRID
- 1390282679225524096
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- NII論文ID
- 10024810480
- 130004454075
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- NII書誌ID
- AA1151294X
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- ISSN
- 13475320
- 13459678
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- NDL書誌ID
- 9750647
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- 抄録ライセンスフラグ
- 使用不可