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  4. Nanoporous gold : testing macro-scale samples to probe small-scale mechanical behavior
 
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Nanoporous gold : testing macro-scale samples to probe small-scale mechanical behavior

Citation Link: https://doi.org/10.15480/882.1677
Publikationstyp
Journal Article
Date Issued
2015-10-16
Sprache
English
Author(s)
Mameka, Nadiia  
Wang, Ke  
Markmann, Jürgen 
Lilleodden, Erica  
Weissmüller, Jörg  
Institut
Keramische Hochleistungswerkstoffe M-9  
Werkstoffphysik und -technologie M-22  
TORE-DOI
10.15480/882.1677
TORE-URI
http://tubdok.tub.tuhh.de/handle/11420/1680
Journal
Materials Research Letters  
Volume
4
Issue
1
Start Page
27
End Page
36
Citation
Materials Research Letters 1 (4): 27-36 (2016)
Publisher DOI
10.1080/21663831.2015.1094679
Scopus ID
2-s2.0-84969952436
Publisher
Taylor & Francis
Nanoporous gold made by dealloying exemplifies how the exciting mechanical properties of nanoscale objects can be exploited in designing materials from which macroscopic things can be formed. The homogeneous microstructure and the possibility of adjusting the ligament size, L, between few and few hundred nm, along with the high deformability and reproducible mechanical behavior predestine the material for model studies of small-scale plasticity using reliable macroscopic testing schemes on mm- or cm-size samples. Such experiments tend to agree with the Gibson-Ashby scaling relation for strength versus solid fraction, while suggesting an essentially L−1 scaling of the local strength of the ligaments. By contrast, the elastic compliance is dramatically enhanced compared to the Gibson-Ashby relation for the stiffness. Contrary to intuition, the anomalously compliant behavior of the nanomaterial goes along with a trend for more stiffness at smaller L. This article discusses surface excess elasticity, nonlinear elastic behavior and specifically shear instability of the bulk, network connectivity, and the surface chemistry as relevant issues which deserve further study.
DDC Class
620: Ingenieurwissenschaften
Funding(s)
SFB 986, Teilproject B4 - Mikromechanisches Materialverhalten hierarchischer Werkstoffe  
SFB 986: Teilprojekt B2 - Feste und leichte Hybridwerkstoffe auf Basis nanoporöser Metalle  
Publication version
publishedVersion
Lizenz
https://creativecommons.org/licenses/by/4.0/
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