Time-resolved atomic-scale observations of deformation and fracture of nanoporous gold under tension

Pan Liu; Xiao Wei; Shuangxi Song; Lihua Wang; Akihiko Hirata; Takeshi Fujita; Xiaodong Han; Ze Zhang; Mingwei Chen

doi:10.1016/j.actamat.2018.11.022

Time-resolved atomic-scale observations of deformation and fracture of nanoporous gold under tension

Pan Liu^*, Xiao Wei, Shuangxi Song, Lihua Wang, Akihiko Hirata, Takeshi Fujita, Xiaodong Han, Ze Zhang, Mingwei Chen

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

31 Citations (Scopus)

Abstract

It has been known for decades that nanopores produced by selective leaching during galvanic corrosion can lead to dramatic loss of materials ductility and strength under tension. However, the underlying atomic mechanisms of the nanopore induced embrittlement remain to be poorly known. Here we report in situ observations of the deformation and failure of dealloyed nanoporous gold by utilizing the state-of-the art aberration-corrected transmission electron microscopy and fast direct electron detection camera. Our time-resolved atomic observations reveal that the brittle failure of the nanoporous gold originates from plastic instability of individual gold ligaments by the interplay between dislocation plasticity and stress-driving surface diffusion.

Original language	English
Pages (from-to)	99-108
Number of pages	10
Journal	Acta Materialia
Volume	165
DOIs	https://doi.org/10.1016/j.actamat.2018.11.022
Publication status	Published - 2019 Feb 15
Externally published	Yes

Keywords

Deformation
Failure
In situ TEM
Nanoporous gold
Tensile property

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Ceramics and Composites
Polymers and Plastics
Metals and Alloys

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10.1016/j.actamat.2018.11.022

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title = "Time-resolved atomic-scale observations of deformation and fracture of nanoporous gold under tension",

abstract = "It has been known for decades that nanopores produced by selective leaching during galvanic corrosion can lead to dramatic loss of materials ductility and strength under tension. However, the underlying atomic mechanisms of the nanopore induced embrittlement remain to be poorly known. Here we report in situ observations of the deformation and failure of dealloyed nanoporous gold by utilizing the state-of-the art aberration-corrected transmission electron microscopy and fast direct electron detection camera. Our time-resolved atomic observations reveal that the brittle failure of the nanoporous gold originates from plastic instability of individual gold ligaments by the interplay between dislocation plasticity and stress-driving surface diffusion.",

keywords = "Deformation, Failure, In situ TEM, Nanoporous gold, Tensile property",

author = "Pan Liu and Xiao Wei and Shuangxi Song and Lihua Wang and Akihiko Hirata and Takeshi Fujita and Xiaodong Han and Ze Zhang and Mingwei Chen",

note = "Funding Information: This work is sponsored by National Natural Science Foundation of China ( 51271113 , 11327901 , 11704245 , 11234011 ); by Shanghai Pujiang Program ( 17PJ1403700 ); and by JST-CREST {"}Phase Interface Science for Highly Efficient Energy Utilization{"}, JST, Japan. M. C. is sponsored by the Whiting School of Engineering, Johns Hopkins University . Publisher Copyright: {\textcopyright} 2018 Acta Materialia Inc.",

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doi = "10.1016/j.actamat.2018.11.022",

language = "English",

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T1 - Time-resolved atomic-scale observations of deformation and fracture of nanoporous gold under tension

AU - Liu, Pan

AU - Wei, Xiao

AU - Song, Shuangxi

AU - Wang, Lihua

AU - Hirata, Akihiko

AU - Fujita, Takeshi

AU - Han, Xiaodong

AU - Zhang, Ze

AU - Chen, Mingwei

N1 - Funding Information: This work is sponsored by National Natural Science Foundation of China ( 51271113 , 11327901 , 11704245 , 11234011 ); by Shanghai Pujiang Program ( 17PJ1403700 ); and by JST-CREST "Phase Interface Science for Highly Efficient Energy Utilization", JST, Japan. M. C. is sponsored by the Whiting School of Engineering, Johns Hopkins University . Publisher Copyright: © 2018 Acta Materialia Inc.

PY - 2019/2/15

Y1 - 2019/2/15

N2 - It has been known for decades that nanopores produced by selective leaching during galvanic corrosion can lead to dramatic loss of materials ductility and strength under tension. However, the underlying atomic mechanisms of the nanopore induced embrittlement remain to be poorly known. Here we report in situ observations of the deformation and failure of dealloyed nanoporous gold by utilizing the state-of-the art aberration-corrected transmission electron microscopy and fast direct electron detection camera. Our time-resolved atomic observations reveal that the brittle failure of the nanoporous gold originates from plastic instability of individual gold ligaments by the interplay between dislocation plasticity and stress-driving surface diffusion.

AB - It has been known for decades that nanopores produced by selective leaching during galvanic corrosion can lead to dramatic loss of materials ductility and strength under tension. However, the underlying atomic mechanisms of the nanopore induced embrittlement remain to be poorly known. Here we report in situ observations of the deformation and failure of dealloyed nanoporous gold by utilizing the state-of-the art aberration-corrected transmission electron microscopy and fast direct electron detection camera. Our time-resolved atomic observations reveal that the brittle failure of the nanoporous gold originates from plastic instability of individual gold ligaments by the interplay between dislocation plasticity and stress-driving surface diffusion.

KW - Deformation

KW - Failure

KW - In situ TEM

KW - Nanoporous gold

KW - Tensile property

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M3 - Article

AN - SCOPUS:85057262824

SN - 1359-6454

VL - 165

SP - 99

EP - 108

JO - Acta Materialia

JF - Acta Materialia

ER -

Time-resolved atomic-scale observations of deformation and fracture of nanoporous gold under tension

Abstract

Keywords

ASJC Scopus subject areas

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