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Nano Lett. 2015 Sep 9;15(9):6082-7. doi: 10.1021/acs.nanolett.5b02330. Epub 2015 Aug 4.

Torsional Detwinning Domino in Nanotwinned One-Dimensional Nanostructures.

Author information

1
Center of Advanced Mechanics and Materials, Applied Mechanics Laboratory, Department of Engineering Mechanics, Tsinghua University , Beijing 100084, China.
2
School of Engineering, Brown University , Providence, Rhode Island 02912, United States.
3
International Center for Applied Mechanics, State Key Laboratory for Strength and Vibration of Mechanical Structures, Xi'an Jiaotong University , Xi'an 710049, China.
4
Department of Engineering Mechanics, Zhejiang University , Hangzhou 310027, China.

Abstract

How to maintain sustained deformation in one-dimensional nanostructures without localized failure is an important question for many applications of nanotechnology. Here we report a phenomenon of torsional detwinning domino that leads to giant rotational deformation without localized failure in nanotwinned one-dimensional metallic nanostructures. This mechanism is demonstrated in nanotwinned Cu nanorods via molecular dynamics simulations, where coherent twin boundaries are transformed into twist boundaries and then dissolved one by one, resulting in practically unlimited rotational deformation. This finding represents a fundamental advance in our understanding of deformation mechanisms in one-dimensional metallic nanostructures.

KEYWORDS:

Detwinning; atomistic simulation; one-dimensional nanostructures; plastic deformation; torsion

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