Origin of size dependency in coherent-twin-propagation-mediated tensile deformation of noble metal nanowires

Jong Hyun Seo, Harold S. Park, Youngdong Yoo, Tae Yeon Seong, Ju Li, Jae Pyoung Ahn, Bongsoo Kim, In Suk Choi

Research output: Contribution to journalArticle

57 Citations (Scopus)

Abstract

Researchers have recently discovered ultrastrong and ductile behavior of Au nanowires (NWs) through long-ranged coherent-twin-propagation. An elusive but fundamentally important question arises whether the size and surface effects impact the twin propagation behavior with a decreasing diameter. In this work, we demonstrate size-dependent strength behavior of ultrastrong and ductile metallic NWs. For Au, Pd, and AuPd NWs, high ductility of about 50% is observed through coherent twin propagation, which occurs by a concurrent reorientation of the bounding surfaces from {111} to {100}. Importantly, the ductility is not reduced with an increase in strength, while the twin propagation stress dramatically increases with decreasing NW diameter from 250 to 40 nm. Furthermore, we find that the power-law exponent describing the twin propagation stress is fundamentally different from the exponent describing the size-dependence of the yield strength. Specifically, the inverse diameter-dependence of the twin propagation stress is directly attributed to surface reorientation, which can be captured by a surface energy differential model. Our work further highlights the fundamental role that surface reorientations play in enhancing the size-dependent mechanical behavior and properties of metal NWs that imply the feasibility of high efficiency mechanical energy storage devices suggested before.

Original languageEnglish
Pages (from-to)5112-5116
Number of pages5
JournalNano Letters
Volume13
Issue number11
DOIs
Publication statusPublished - 2013 Nov 13

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tensile deformation
Precious metals
noble metals
stress propagation
Nanowires
nanowires
propagation
retraining
ductility
Ductility
exponents
yield strength
energy storage
Interfacial energy
Energy storage
surface energy
Yield stress
Metals
metals

Keywords

  • Nanowires
  • size effect
  • surface energy
  • twin propagation
  • ultrastrong and ductile

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Mechanical Engineering

Cite this

Origin of size dependency in coherent-twin-propagation-mediated tensile deformation of noble metal nanowires. / Seo, Jong Hyun; Park, Harold S.; Yoo, Youngdong; Seong, Tae Yeon; Li, Ju; Ahn, Jae Pyoung; Kim, Bongsoo; Choi, In Suk.

In: Nano Letters, Vol. 13, No. 11, 13.11.2013, p. 5112-5116.

Research output: Contribution to journalArticle

Seo, Jong Hyun ; Park, Harold S. ; Yoo, Youngdong ; Seong, Tae Yeon ; Li, Ju ; Ahn, Jae Pyoung ; Kim, Bongsoo ; Choi, In Suk. / Origin of size dependency in coherent-twin-propagation-mediated tensile deformation of noble metal nanowires. In: Nano Letters. 2013 ; Vol. 13, No. 11. pp. 5112-5116.
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