Please use this identifier to cite or link to this item: https://doi.org/10.15480/882.3577
Publisher DOI: 10.1080/21663831.2021.1924305
Title: Imaging the deformation-induced accumulation of defects in nanoporous gold
Language: English
Authors: Liu, Maowen 
Weissmüller, Jörg 
Keywords: deformation;Lomer-Cottrell lock;Nanoporous gold;transmission electron microscopy;twinning
Issue Date: 17-May-2021
Publisher: Taylor & Francis
Source: Materials Research Letters 9 (9): 359-365 (2021)
Journal: Materials Research Letters 
Abstract (english): 
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.
URI: http://hdl.handle.net/11420/9655
DOI: 10.15480/882.3577
ISSN: 2166-3831
Institute: Werkstoffphysik und -technologie M-22 
Document Type: Article
Funded by: Deutsche Forschungsgemeinschaft (DFG) 
Project: SFB 986: Teilprojekt B2 - Feste und leichte Hybridwerkstoffe auf Basis nanoporöser Metalle 
License: CC BY-NC 4.0 (Attribution-NonCommercial) CC BY-NC 4.0 (Attribution-NonCommercial)
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