In Situ Study of Twin Boundary Stability in Nanotwinned Copper Pillars under Different Strain Rates
The nanoscopic deformation of ⟨111⟩ nanotwinned copper nanopillars under strain rates between 10<sup>−5</sup>/s and 5 × 10<sup>−4</sup>/s was studied by using in situ transmission electron microscopy. The correlation among dislocation activity, twin boundary instability due t...
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MDPI AG
2023-01-01
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| Series: | Nanomaterials |
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| Online Access: | https://www.mdpi.com/2079-4991/13/1/190 |
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| author | Shou-Yi Chang Yi-Chung Huang Shao-Yi Lin Chia-Ling Lu Chih Chen Ming Dao |
| author_facet | Shou-Yi Chang Yi-Chung Huang Shao-Yi Lin Chia-Ling Lu Chih Chen Ming Dao |
| author_sort | Shou-Yi Chang |
| collection | DOAJ |
| description | The nanoscopic deformation of ⟨111⟩ nanotwinned copper nanopillars under strain rates between 10<sup>−5</sup>/s and 5 × 10<sup>−4</sup>/s was studied by using in situ transmission electron microscopy. The correlation among dislocation activity, twin boundary instability due to incoherent twin boundary migration and corresponding mechanical responses was investigated. Dislocations piled up in the nanotwinned copper, giving rise to significant hardening at relatively high strain rates of 3–5 × 10<sup>−4</sup>/s. Lower strain rates resulted in detwinning and reduced hardening, while corresponding deformation mechanisms are proposed based on experimental results. At low/ultralow strain rates below 6 × 10<sup>−5</sup>/s, dislocation activity almost ceased operating, but the migration of twin boundaries via the 1/4 ⟨<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mn>10</mn><mover accent="true"><mn>1</mn><mo>¯</mo></mover></mrow></semantics></math></inline-formula> ⟩ kink-like motion of atoms is suggested as the detwinning mechanism. At medium strain rates of 1–2 × 10<sup>−4</sup>/s, detwinning was decelerated likely due to the interfered kink-like motion of atoms by activated partial dislocations, while dislocation climb may alternatively dominate detwinning. These results indicate that, even for the same nanoscale twin boundary spacing, different nanomechanical deformation mechanisms can operate at different strain rates. |
| first_indexed | 2024-03-09T03:29:01Z |
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| issn | 2079-4991 |
| language | English |
| last_indexed | 2024-03-09T03:29:01Z |
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| series | Nanomaterials |
| spelling | doaj.art-fb71c359609a4317b0d11c5895f372ac2023-12-03T14:58:59ZengMDPI AGNanomaterials2079-49912023-01-0113119010.3390/nano13010190In Situ Study of Twin Boundary Stability in Nanotwinned Copper Pillars under Different Strain RatesShou-Yi Chang0Yi-Chung Huang1Shao-Yi Lin2Chia-Ling Lu3Chih Chen4Ming Dao5Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu 30013, TaiwanDepartment of Materials Science and Engineering, National Chung Hsing University, Taichung 40227, TaiwanDepartment of Materials Science and Engineering, National Chung Hsing University, Taichung 40227, TaiwanDepartment of Materials Science and Engineering, National Yang Ming Chiao Tung University, Hsinchu 30010, TaiwanDepartment of Materials Science and Engineering, National Yang Ming Chiao Tung University, Hsinchu 30010, TaiwanDepartment of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USAThe nanoscopic deformation of ⟨111⟩ nanotwinned copper nanopillars under strain rates between 10<sup>−5</sup>/s and 5 × 10<sup>−4</sup>/s was studied by using in situ transmission electron microscopy. The correlation among dislocation activity, twin boundary instability due to incoherent twin boundary migration and corresponding mechanical responses was investigated. Dislocations piled up in the nanotwinned copper, giving rise to significant hardening at relatively high strain rates of 3–5 × 10<sup>−4</sup>/s. Lower strain rates resulted in detwinning and reduced hardening, while corresponding deformation mechanisms are proposed based on experimental results. At low/ultralow strain rates below 6 × 10<sup>−5</sup>/s, dislocation activity almost ceased operating, but the migration of twin boundaries via the 1/4 ⟨<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mn>10</mn><mover accent="true"><mn>1</mn><mo>¯</mo></mover></mrow></semantics></math></inline-formula> ⟩ kink-like motion of atoms is suggested as the detwinning mechanism. At medium strain rates of 1–2 × 10<sup>−4</sup>/s, detwinning was decelerated likely due to the interfered kink-like motion of atoms by activated partial dislocations, while dislocation climb may alternatively dominate detwinning. These results indicate that, even for the same nanoscale twin boundary spacing, different nanomechanical deformation mechanisms can operate at different strain rates.https://www.mdpi.com/2079-4991/13/1/190in situ nanoscopic deformationnanotwinned coppertwin boundarydetwinningdislocation activityatom motion |
| spellingShingle | Shou-Yi Chang Yi-Chung Huang Shao-Yi Lin Chia-Ling Lu Chih Chen Ming Dao In Situ Study of Twin Boundary Stability in Nanotwinned Copper Pillars under Different Strain Rates Nanomaterials in situ nanoscopic deformation nanotwinned copper twin boundary detwinning dislocation activity atom motion |
| title | In Situ Study of Twin Boundary Stability in Nanotwinned Copper Pillars under Different Strain Rates |
| title_full | In Situ Study of Twin Boundary Stability in Nanotwinned Copper Pillars under Different Strain Rates |
| title_fullStr | In Situ Study of Twin Boundary Stability in Nanotwinned Copper Pillars under Different Strain Rates |
| title_full_unstemmed | In Situ Study of Twin Boundary Stability in Nanotwinned Copper Pillars under Different Strain Rates |
| title_short | In Situ Study of Twin Boundary Stability in Nanotwinned Copper Pillars under Different Strain Rates |
| title_sort | in situ study of twin boundary stability in nanotwinned copper pillars under different strain rates |
| topic | in situ nanoscopic deformation nanotwinned copper twin boundary detwinning dislocation activity atom motion |
| url | https://www.mdpi.com/2079-4991/13/1/190 |
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