Room-temperature superplasticity in Au nanowires and their atomistic mechanisms

Pan Liu; Lihua Wang; Yonghai Yue; Shuangxi Song; Xiaodong Wang; Kolan Madhav Reddy; Xiaozhou Liao; Ze Zhang; Mingwei Chen; Xiaodong Han

doi:10.1039/C9NR02053E

Room-temperature superplasticity in Au nanowires and their atomistic mechanisms†

Pan Liu,

*^ab Lihua Wang,^c Yonghai Yue,^d Shuangxi Song,^ab Xiaodong Wang,^ab Kolan Madhav Reddy,^ab Xiaozhou Liao,

*^e Ze Zhang,^cf Mingwei Chen

*^ag and Xiaodong Han*^c

Author affiliations

* Corresponding authors

^a Shanghai Key Laboratory of Advanced High-Temperature Materials and Precision Forming, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
E-mail: panliu@sjtu.edu.cn

^b State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China

^c Institute of Microstructure and Properties of Advanced Materials, Beijing University of Technology, Beijing, China
E-mail: xdhan@bjut.edu.cn

^d Beijing Key Laboratory of Bio-Inspired Energy Materials and Devices, School of Chemistry and Environment, Beihang University, Beijing 100191, China

^e School of Aerospace, Mechanical and Mechatronic Engineering, The University of Sydney, Sydney, NSW 2006, Australia
E-mail: xiaozhou.liao@sydney.edu.au

^f Department of Materials Science, Zhejiang University, Hangzhou, China

^g Department of Materials Science and Engineering, Johns Hopkins University, Baltimore, MD 21218, USA
E-mail: mwchen@jhu.edu

Abstract

We report experimental observation of room-temperature superplasticity and the distinct nanosize effect on the deformation mechanisms of Au nanowires. The Au nanowires were subjected to in situ tensile straining in a transmission electron microscope by using a home-made strain actuator, and a super large plastic strain with ∼150% uniform elongation and ∼260% total strain were observed before fracture. The plastic deformation started through full dislocation slip and was followed by the activities of stacking fault ribbons (or dissociated full dislocations) that were generated from surface sources and disappeared at the other end surfaces. With the reduction of the diameter of Au nanowires, the deformation changed to the twinning mode through partial dislocation emissions from sample surfaces. The mechanisms behind the observed phenomena are discussed in detail. These results shed light on the size-controlled plasticity of nano-metals.

Nanoscale

Room-temperature superplasticity in Au nanowires and their atomistic mechanisms†

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Room-temperature superplasticity in Au nanowires and their atomistic mechanisms

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