期刊
NANO LETTERS
卷 21, 期 19, 页码 8378-8384出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.1c02970
关键词
Penta-twin; twin boundary; twin boundary migration; twin boundary sliding; in situ nanomechanical testing
类别
资金
- National Natural Science Foundation of China [51771172, 52071284, 11902289, 12172324]
This study demonstrates the deformation behavior of penta-twinned nanomaterials under high shear stress, showing structural destruction and core reconstruction of the penta-twins. The intrinsic deformation behaviors enable the possibility of controlling the morphology of penta-twinned nanomaterials with unique properties.
Penta-twinned nanomaterials often exhibit unique mechanical properties. However, the intrinsic deformation behavior of penta-twins remains largely unclear, especially under the condition of high shear stress. In this study, we show that the deformation of penta-twins often subject to a structural destruction via dislocation-mediated coordinated twin boundary (TB) deformation, resulting in a reconstructed pentagon-shaped core. This reconstructed core region is mainly induced by the coordinated TB migration along different directions (for the nucleation and growth) and accelerated by the TB sliding (for the growth). The destructed penta-twin core can effectively accommodate the intrinsic disclination of the penta-twin, which further collapses beyond a critical size, as predicted by an energy-based criterion. These intrinsic deformation behaviors of penta-twins would enable the possibility of controlling the morphology of penta-twinned nanomaterials with unique properties.
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