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Penta-Twin Destruction by Coordinated Twin Boundary Deformation
Yingbin Chen1, Qishan Huang2, Shuchun Zhao1
1Center of Electron Microscopy and State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, P.R. China.
Nano Letters
|September 30, 2021
Summary
Deformation in penta-twinned nanomaterials involves structural destruction and coordinated twin boundary (TB) movement. This process reconstructs the core, accommodating intrinsic disclinations and enabling control over nanomaterial morphology.
Area of Science:
- Materials Science
- Nanotechnology
- Mechanical Engineering
Background:
- Penta-twinned nanomaterials possess unique mechanical properties.
- The deformation mechanisms of penta-twins under high shear stress are not well understood.
Purpose of the Study:
- To elucidate the intrinsic deformation behavior of penta-twinned nanomaterials under high shear stress.
- To investigate the role of twin boundaries (TBs) in penta-twin deformation.
Main Methods:
- Analysis of dislocation-mediated coordinated twin boundary (TB) deformation.
- Observation of reconstructed pentagon-shaped core formation.
- Application of an energy-based criterion to predict core collapse.
Main Results:
- Penta-twin deformation leads to structural destruction via coordinated TB deformation.
- A reconstructed pentagon-shaped core is formed through TB migration and sliding.
- The destructed core accommodates intrinsic disclinations and collapses beyond a critical size.
Conclusions:
- The deformation mechanism involves coordinated TB migration and sliding, leading to core reconstruction.
- The energy-based criterion accurately predicts the collapse of the destructed core.
- Understanding these behaviors allows for controlling the morphology of penta-twinned nanomaterials.
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