Effect of De-Twinning on Tensile Strength of Nano-Twinned Cu Films
Tensile tests were carried on the electroplated Cu films with various densities of twin grain boundary. With TEM images and a selected area diffraction pattern, nano-twinned structure can be observed and defined in the electroplated Cu films. The density of the nano-twin grain structure can be manip...
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MDPI AG
2021-06-01
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| Series: | Nanomaterials |
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| author | Chia-Hung Lee Erh-Ju Lin Jyun-Yang Wang Yi-Xuan Lin Chen-Yu Wu Chung-Yu Chiu Ching-Yu Yeh Bo-Rong Huang Kuan-Lin Fu Cheng-Yi Liu |
| author_facet | Chia-Hung Lee Erh-Ju Lin Jyun-Yang Wang Yi-Xuan Lin Chen-Yu Wu Chung-Yu Chiu Ching-Yu Yeh Bo-Rong Huang Kuan-Lin Fu Cheng-Yi Liu |
| author_sort | Chia-Hung Lee |
| collection | DOAJ |
| description | Tensile tests were carried on the electroplated Cu films with various densities of twin grain boundary. With TEM images and a selected area diffraction pattern, nano-twinned structure can be observed and defined in the electroplated Cu films. The density of the nano-twin grain structure can be manipulated with the concentration of gelatin in the Cu-sulfate electrolyte solution. We found that the strength of the Cu films is highly related to the twin-boundary density. The Cu film with a greater twin-boundary density has a larger fracture strength than the Cu film with a lesser twin-boundary density. After tensile tests, necking phenomenon (about 20 μm) occurred in the fractured Cu films. Moreover, by focused ion beam (FIB) cross-sectional analysis, the de-twinning can be observed in the region where necking begins. Thus, we believe that the de-twinning of the nano-twinned structure initiates the plastic deformation of the nano-twinned Cu films. Furthermore, with the analysis of the TEM images on the nano-twinned structure in the necking region of the fractured Cu films, the de-twinning mechanism attributes to two processes: (1) the ledge formation by the engagement of the dislocations with the twin boundaries and (2) the collapse of the ledges with the opposite twin-boundaries. In conclusion, the plastic deformation of nano-twinned Cu films is governed by the de-twinning of the nano-twinned structure. Moreover, the fracture strength of the nano-twinned Cu films is proportional to the twin-boundaries density. |
| first_indexed | 2024-03-10T10:11:48Z |
| format | Article |
| id | doaj.art-890066b2ded346778f4a399fb5dd9352 |
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| issn | 2079-4991 |
| language | English |
| last_indexed | 2024-03-10T10:11:48Z |
| publishDate | 2021-06-01 |
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| record_format | Article |
| series | Nanomaterials |
| spelling | doaj.art-890066b2ded346778f4a399fb5dd93522023-11-22T01:06:59ZengMDPI AGNanomaterials2079-49912021-06-01117163010.3390/nano11071630Effect of De-Twinning on Tensile Strength of Nano-Twinned Cu FilmsChia-Hung Lee0Erh-Ju Lin1Jyun-Yang Wang2Yi-Xuan Lin3Chen-Yu Wu4Chung-Yu Chiu5Ching-Yu Yeh6Bo-Rong Huang7Kuan-Lin Fu8Cheng-Yi Liu9Department of Chemical Engineering and Materials Engineering, National Central University, Jhong-Li 32001, TaiwanDepartment of Chemical Engineering and Materials Engineering, National Central University, Jhong-Li 32001, TaiwanDepartment of Chemical Engineering and Materials Engineering, National Central University, Jhong-Li 32001, TaiwanDepartment of Chemical Engineering and Materials Engineering, National Central University, Jhong-Li 32001, TaiwanDepartment of Chemical Engineering and Materials Engineering, National Central University, Jhong-Li 32001, TaiwanDepartment of Chemical Engineering and Materials Engineering, National Central University, Jhong-Li 32001, TaiwanDepartment of Chemical Engineering and Materials Engineering, National Central University, Jhong-Li 32001, TaiwanDepartment of Chemical Engineering and Materials Engineering, National Central University, Jhong-Li 32001, TaiwanDepartment of Chemical Engineering and Materials Engineering, National Central University, Jhong-Li 32001, TaiwanDepartment of Chemical Engineering and Materials Engineering, National Central University, Jhong-Li 32001, TaiwanTensile tests were carried on the electroplated Cu films with various densities of twin grain boundary. With TEM images and a selected area diffraction pattern, nano-twinned structure can be observed and defined in the electroplated Cu films. The density of the nano-twin grain structure can be manipulated with the concentration of gelatin in the Cu-sulfate electrolyte solution. We found that the strength of the Cu films is highly related to the twin-boundary density. The Cu film with a greater twin-boundary density has a larger fracture strength than the Cu film with a lesser twin-boundary density. After tensile tests, necking phenomenon (about 20 μm) occurred in the fractured Cu films. Moreover, by focused ion beam (FIB) cross-sectional analysis, the de-twinning can be observed in the region where necking begins. Thus, we believe that the de-twinning of the nano-twinned structure initiates the plastic deformation of the nano-twinned Cu films. Furthermore, with the analysis of the TEM images on the nano-twinned structure in the necking region of the fractured Cu films, the de-twinning mechanism attributes to two processes: (1) the ledge formation by the engagement of the dislocations with the twin boundaries and (2) the collapse of the ledges with the opposite twin-boundaries. In conclusion, the plastic deformation of nano-twinned Cu films is governed by the de-twinning of the nano-twinned structure. Moreover, the fracture strength of the nano-twinned Cu films is proportional to the twin-boundaries density.https://www.mdpi.com/2079-4991/11/7/1630de-twinningnano-twinned Cutensile strength |
| spellingShingle | Chia-Hung Lee Erh-Ju Lin Jyun-Yang Wang Yi-Xuan Lin Chen-Yu Wu Chung-Yu Chiu Ching-Yu Yeh Bo-Rong Huang Kuan-Lin Fu Cheng-Yi Liu Effect of De-Twinning on Tensile Strength of Nano-Twinned Cu Films Nanomaterials de-twinning nano-twinned Cu tensile strength |
| title | Effect of De-Twinning on Tensile Strength of Nano-Twinned Cu Films |
| title_full | Effect of De-Twinning on Tensile Strength of Nano-Twinned Cu Films |
| title_fullStr | Effect of De-Twinning on Tensile Strength of Nano-Twinned Cu Films |
| title_full_unstemmed | Effect of De-Twinning on Tensile Strength of Nano-Twinned Cu Films |
| title_short | Effect of De-Twinning on Tensile Strength of Nano-Twinned Cu Films |
| title_sort | effect of de twinning on tensile strength of nano twinned cu films |
| topic | de-twinning nano-twinned Cu tensile strength |
| url | https://www.mdpi.com/2079-4991/11/7/1630 |
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