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- W4313472632 abstract "The nanoscopic deformation of ⟨111⟩ nanotwinned copper nanopillars under strain rates between 10-5/s and 5 × 10-4/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 × 10-4/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 × 10-5/s, dislocation activity almost ceased operating, but the migration of twin boundaries via the 1/4 ⟨101¯ ⟩ kink-like motion of atoms is suggested as the detwinning mechanism. At medium strain rates of 1-2 × 10-4/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." @default.
- W4313472632 created "2023-01-06" @default.
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- W4313472632 date "2023-01-01" @default.
- W4313472632 modified "2023-10-14" @default.
- W4313472632 title "In Situ Study of Twin Boundary Stability in Nanotwinned Copper Pillars under Different Strain Rates" @default.
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- W4313472632 doi "https://doi.org/10.3390/nano13010190" @default.
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