Size Effect and Deformation Mechanism in Twinned Copper Nanowires
Molecular dynamics simulations were performed to demonstrate the synergistic effects of the extrinsic size (nanowire length) and intrinsic size (twin boundary spacing) on the failure manner, yield strength, ductility and deformation mechanism of the twinned nanowires containing high density coherent...
| Main Authors: | , , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2017-10-01
|
| Series: | Metals |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2075-4701/7/10/438 |
| _version_ | 1819159974957285376 |
|---|---|
| author | Jiapeng Sun Cheng Li Jing Han Xiaoyan Shao Xiaowei Yang Huan Liu Dan Song Aibin Ma |
| author_facet | Jiapeng Sun Cheng Li Jing Han Xiaoyan Shao Xiaowei Yang Huan Liu Dan Song Aibin Ma |
| author_sort | Jiapeng Sun |
| collection | DOAJ |
| description | Molecular dynamics simulations were performed to demonstrate the synergistic effects of the extrinsic size (nanowire length) and intrinsic size (twin boundary spacing) on the failure manner, yield strength, ductility and deformation mechanism of the twinned nanowires containing high density coherent twin boundaries CTBs paralleled to the nanowires’ axis. The twinned nanowires show an intense extrinsic size effect, i.e., shorter is stronger and more ductile, and an intense intrinsic size effect, i.e., thinner is stronger. Notably, the strengthening effect degradation of CTBs in the twinned nanowires is observed with an increase in nanowire length: remarkable strengthening effect can be obtained for the short nanowires, but the strengthening effect becomes less pronounced for the long nanowires. The twinned nanowires fail via a ductile manner or via a brittle manner depending on the synergistic effect of the nanowire length and twin boundary spacing. By atomic-level observation of the plastic deformation, we found that the emission of a trailing 30° partial from the free surface controls the yield behavior of the twinned nanowires. We also found that the special zigzag extended dislocations are formed by the dislocation–CTBs interactions, and propagate to sustain the plastic deformation. |
| first_indexed | 2024-12-22T16:49:05Z |
| format | Article |
| id | doaj.art-ace2b1988f0e479fba6eb0390f98f097 |
| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-12-22T16:49:05Z |
| publishDate | 2017-10-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Metals |
| spelling | doaj.art-ace2b1988f0e479fba6eb0390f98f0972022-12-21T18:19:39ZengMDPI AGMetals2075-47012017-10-0171043810.3390/met7100438met7100438Size Effect and Deformation Mechanism in Twinned Copper NanowiresJiapeng Sun0Cheng Li1Jing Han2Xiaoyan Shao3Xiaowei Yang4Huan Liu5Dan Song6Aibin Ma7College of Mechanics and Materials, Hohai University, Nanjing 210098, ChinaCollege of Mechanics and Materials, Hohai University, Nanjing 210098, ChinaSchool of Mechanical and Electrical Engineering, China University of Mining and Technology, Xuzhou 221116, ChinaSchool of Engineering and Technology, China University of Geosciences, Beijing 100083, ChinaCollege of Mechanics and Materials, Hohai University, Nanjing 210098, ChinaCollege of Mechanics and Materials, Hohai University, Nanjing 210098, ChinaCollege of Mechanics and Materials, Hohai University, Nanjing 210098, ChinaCollege of Mechanics and Materials, Hohai University, Nanjing 210098, ChinaMolecular dynamics simulations were performed to demonstrate the synergistic effects of the extrinsic size (nanowire length) and intrinsic size (twin boundary spacing) on the failure manner, yield strength, ductility and deformation mechanism of the twinned nanowires containing high density coherent twin boundaries CTBs paralleled to the nanowires’ axis. The twinned nanowires show an intense extrinsic size effect, i.e., shorter is stronger and more ductile, and an intense intrinsic size effect, i.e., thinner is stronger. Notably, the strengthening effect degradation of CTBs in the twinned nanowires is observed with an increase in nanowire length: remarkable strengthening effect can be obtained for the short nanowires, but the strengthening effect becomes less pronounced for the long nanowires. The twinned nanowires fail via a ductile manner or via a brittle manner depending on the synergistic effect of the nanowire length and twin boundary spacing. By atomic-level observation of the plastic deformation, we found that the emission of a trailing 30° partial from the free surface controls the yield behavior of the twinned nanowires. We also found that the special zigzag extended dislocations are formed by the dislocation–CTBs interactions, and propagate to sustain the plastic deformation.https://www.mdpi.com/2075-4701/7/10/438twinningnanowiremolecular dynamicsplasticityductilityfracture |
| spellingShingle | Jiapeng Sun Cheng Li Jing Han Xiaoyan Shao Xiaowei Yang Huan Liu Dan Song Aibin Ma Size Effect and Deformation Mechanism in Twinned Copper Nanowires Metals twinning nanowire molecular dynamics plasticity ductility fracture |
| title | Size Effect and Deformation Mechanism in Twinned Copper Nanowires |
| title_full | Size Effect and Deformation Mechanism in Twinned Copper Nanowires |
| title_fullStr | Size Effect and Deformation Mechanism in Twinned Copper Nanowires |
| title_full_unstemmed | Size Effect and Deformation Mechanism in Twinned Copper Nanowires |
| title_short | Size Effect and Deformation Mechanism in Twinned Copper Nanowires |
| title_sort | size effect and deformation mechanism in twinned copper nanowires |
| topic | twinning nanowire molecular dynamics plasticity ductility fracture |
| url | https://www.mdpi.com/2075-4701/7/10/438 |
| work_keys_str_mv | AT jiapengsun sizeeffectanddeformationmechanismintwinnedcoppernanowires AT chengli sizeeffectanddeformationmechanismintwinnedcoppernanowires AT jinghan sizeeffectanddeformationmechanismintwinnedcoppernanowires AT xiaoyanshao sizeeffectanddeformationmechanismintwinnedcoppernanowires AT xiaoweiyang sizeeffectanddeformationmechanismintwinnedcoppernanowires AT huanliu sizeeffectanddeformationmechanismintwinnedcoppernanowires AT dansong sizeeffectanddeformationmechanismintwinnedcoppernanowires AT aibinma sizeeffectanddeformationmechanismintwinnedcoppernanowires |