期刊
NATURE MATERIALS
卷 12, 期 8, 页码 697-702出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/NMAT3646
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资金
- US Department of Energy (DOE) by Lawrence Livermore National Laboratory [DE-AC52-07NA27344]
- Ames Laboratory (Office of Basic Energy Sciences) [DE-AC02-07CH11358]
- US DOE [DE-AC02-06CH11357]
- NSF CAREER program [DMR-0747658]
- Vermont Advanced Computing Centre (NASA) [NNX06AC88G]
- US DOE Early Career Research Program
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [0747658] Funding Source: National Science Foundation
Coherent twin boundaries (CTBs) are widely described, both theoretically and experimentally, as perfect interfaces that play a significant role in a variety of materials. Although the ability of CTBs in strengthening, maintaining the ductility and minimizing the electron scattering is well documented(1-3), most of our understanding of the origin of these properties relies on perfect-interface assumptions. Here we report experiments and simulations demonstrating that as-grown CTBs in nanotwinned copper are inherently defective with kink-like steps and curvature, and that these imperfections consist of incoherent segments and partial dislocations. We further show that these defects play a crucial role in the deformation mechanisms and mechanical behaviour of nanotwinned copper. Our findings offer a view of the structure of CTBs that is largely different from that in the literature(2,4,5), and underscore the significance of imperfections in nanotwin-strengthened materials.
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