Penta-Twin Destruction by Coordinated Twin Boundary Deformation

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 de...

Full description

Saved in:
Bibliographic Details
Published inNano letters Vol. 21; no. 19; pp. 8378 - 8384
Main Authors Chen, Yingbin, Huang, Qishan, Zhao, Shuchun, Zhou, Haofei, Wang, Jiangwei
Format Journal Article
LanguageEnglish
Published American Chemical Society 13.10.2021
Subjects
twin boundary migration
twin boundary sliding
Penta-twin
in situ nanomechanical testing
twin boundary
Online AccessGet full text

Cover

More Information
Summary: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.
Bibliography:ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
ISSN:1530-6984
1530-6992
1530-6992
DOI:10.1021/acs.nanolett.1c02970