Imaging the deformation-induced accumulation of defects in nanoporous gold

Publikationstyp
Journal Article
Publikationsdatum
2021-05-17
Sprache
English
Author
Liu, Maowen 
Weissmüller, Jörg 
Institut
Werkstoffphysik und -technologie M-22 
DOI
10.15480/882.3577
TORE-URI
http://hdl.handle.net/11420/9655
Enthalten in
Materials Research Letters 
Volume
9
Issue
9
Start Page
359
End Page
365
Citation
Materials Research Letters 9 (9): 359-365 (2021)
Publisher DOI
10.1080/21663831.2021.1924305
Scopus ID
2-s2.0-85105985895
Publisher
Taylor & Francis
Nanoporous gold (NPG) provides a model material for studying small-scale deformation and the mechanical behavior of network solids. We report a transmission electron microscopy study of the defect structure in electron-transparent NPG leaf deformed by rolling. The results confirm that plastic deformation significantly enhances the defect density. Specifically, twins are formed on several sets of crystallographic planes, and their interaction forms Lomer-Cottrell locks. This inhibits dislocation escaping from NPG, thus avoiding the dislocation starvation scenario that is often considered in the ‘smaller is stronger' context of small-scale plasticity. Instead, strain hardening is apparently linked to accumulation and interaction of twins.IMPACT STATEMENT: This paper provides a direct observation of the lattice defects in plastically deformed nanoporous gold, confirming the contribution of accumulation and interaction of defects to the strain hardening rate.
Schlagworte
deformation
Lomer-Cottrell lock
Nanoporous gold
transmission electron microscopy
twinning
DDC Class
530: Physik
600: Technik
Publication version
publishedVersion
Lizenz
https://creativecommons.org/licenses/by-nc/4.0/
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