Interactions between Dislocations and Penta-Twins in Metallic Nanocrystals
Dislocation interactions with twin boundary (TB) have been well-established in nanotwinned metals. Penta-twins, as an extreme of crystal twinning, are tacitly assumed to be more effective at blocking dislocation motions than conventional single or coplanar nanotwins. However, the mechanism underlyin...
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MDPI AG
2021-11-01
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| Series: | Metals |
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| Online Access: | https://www.mdpi.com/2075-4701/11/11/1775 |
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| author | Yingbin Chen Qishan Huang Shuchun Zhao Haofei Zhou Jiangwei Wang |
| author_facet | Yingbin Chen Qishan Huang Shuchun Zhao Haofei Zhou Jiangwei Wang |
| author_sort | Yingbin Chen |
| collection | DOAJ |
| description | Dislocation interactions with twin boundary (TB) have been well-established in nanotwinned metals. Penta-twins, as an extreme of crystal twinning, are tacitly assumed to be more effective at blocking dislocation motions than conventional single or coplanar nanotwins. However, the mechanism underlying the interactions between dislocations and penta-twins remains largely unclear. Here, by combining in situ transmission electron microscope (TEM) nanomechanical testing and atomistic simulations, we rationalize the fundamental interactions between dislocations and penta-twins in Au nanocrystals. Our results reveal that the interactions between dislocations and penta-twins show some similar behaviors to the ones in the cases of coplanar nanotwins, including dislocation impedance at TBs, cross-slip into the twinning plane and transmission across the TB. In addition, penta-twins also exhibit some unique behaviors during dislocation interactions, including multiple cross-slip, dislocation-induced core dissociation and climb-induced annihilation/absorption at the penta-twin core. These findings enhance our mechanistic understanding of dislocation behaviors in penta-twins, shedding light on the accessible design of high-performance nanomaterials with multi-twinned nanostructures. |
| first_indexed | 2024-03-10T05:16:27Z |
| format | Article |
| id | doaj.art-1a688fbfb6494e079d7be696e16c5a0b |
| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-03-10T05:16:27Z |
| publishDate | 2021-11-01 |
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| series | Metals |
| spelling | doaj.art-1a688fbfb6494e079d7be696e16c5a0b2023-11-23T00:23:24ZengMDPI AGMetals2075-47012021-11-011111177510.3390/met11111775Interactions between Dislocations and Penta-Twins in Metallic NanocrystalsYingbin Chen0Qishan Huang1Shuchun Zhao2Haofei Zhou3Jiangwei Wang4Center of Electron Microscopy and State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, ChinaCenter for X-Mechanics and State Key Laboratory of Fluid Power and Mechatronic Systems, Department of Engineering Mechanics, Zhejiang University, Hangzhou 310027, ChinaCenter of Electron Microscopy and State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, ChinaCenter for X-Mechanics and State Key Laboratory of Fluid Power and Mechatronic Systems, Department of Engineering Mechanics, Zhejiang University, Hangzhou 310027, ChinaCenter of Electron Microscopy and State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, ChinaDislocation interactions with twin boundary (TB) have been well-established in nanotwinned metals. Penta-twins, as an extreme of crystal twinning, are tacitly assumed to be more effective at blocking dislocation motions than conventional single or coplanar nanotwins. However, the mechanism underlying the interactions between dislocations and penta-twins remains largely unclear. Here, by combining in situ transmission electron microscope (TEM) nanomechanical testing and atomistic simulations, we rationalize the fundamental interactions between dislocations and penta-twins in Au nanocrystals. Our results reveal that the interactions between dislocations and penta-twins show some similar behaviors to the ones in the cases of coplanar nanotwins, including dislocation impedance at TBs, cross-slip into the twinning plane and transmission across the TB. In addition, penta-twins also exhibit some unique behaviors during dislocation interactions, including multiple cross-slip, dislocation-induced core dissociation and climb-induced annihilation/absorption at the penta-twin core. These findings enhance our mechanistic understanding of dislocation behaviors in penta-twins, shedding light on the accessible design of high-performance nanomaterials with multi-twinned nanostructures.https://www.mdpi.com/2075-4701/11/11/1775penta-twindislocationtwin boundaryinteractionin situ nanomechanical testing |
| spellingShingle | Yingbin Chen Qishan Huang Shuchun Zhao Haofei Zhou Jiangwei Wang Interactions between Dislocations and Penta-Twins in Metallic Nanocrystals Metals penta-twin dislocation twin boundary interaction in situ nanomechanical testing |
| title | Interactions between Dislocations and Penta-Twins in Metallic Nanocrystals |
| title_full | Interactions between Dislocations and Penta-Twins in Metallic Nanocrystals |
| title_fullStr | Interactions between Dislocations and Penta-Twins in Metallic Nanocrystals |
| title_full_unstemmed | Interactions between Dislocations and Penta-Twins in Metallic Nanocrystals |
| title_short | Interactions between Dislocations and Penta-Twins in Metallic Nanocrystals |
| title_sort | interactions between dislocations and penta twins in metallic nanocrystals |
| topic | penta-twin dislocation twin boundary interaction in situ nanomechanical testing |
| url | https://www.mdpi.com/2075-4701/11/11/1775 |
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