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Kim, Ju-Young
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Indentation size effect in nanoporous gold

Author(s)
Kim, Young-CheonGwak, Eun-JiAhn, Seung-minJang, Jae-ilHan, Heung NamKim, Ju-Young
Issued Date
2017-10
DOI
10.1016/j.actamat.2017.07.040
URI
https://scholarworks.unist.ac.kr/handle/201301/22585
Fulltext
http://www.sciencedirect.com/science/article/pii/S135964541730602X?via%3Dihub
Citation
ACTA MATERIALIA, v.138, pp.52 - 60
Abstract
We find that hardness of nanoporous gold (np-Au) measured by nanoindentation tends to increase with decreasing indentation depth, similar to the indentation size effect (ISE) in solid materials. While ISE in solid materials is attributed to a local increase in density of geometrically necessary dislocations (GNDs), the origin of ISE in np-Au has not been studied systematically. We prepare four np-Au samples with ligament sizes of 26, 73, 126, and 630 nm by free corrosion dealloying and post heat treatments. For the normalized hardness (hardness/macroscopic hardness) vs normalized indentation depth (indentation depth/three times ligament size), we find that the ISE trends for three np-Au samples of ligament sizes 26, 73, and 127 nm are almost identical, while an enhanced ISE is shown for np-Au with greatest ligament size, 630 nm. We investigate ISE in np-Au based on nanomechanics model for nanoindentation on np-Au with a sharp indenter, uniaxial compression and pure shear testing for np-Au.
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
ISSN
1359-6454
Keyword (Author)
HardnessIndentation size effectNanoindentationNanoporous goldPorous materials
Keyword
DUCTILE CELLULAR SOLIDSMECHANICAL-PROPERTIESCATALYTIC-ACTIVITYYIELD STRENGTHEVOLUTIONAUBEHAVIORSTRAINSCALENANOINDENTATION

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