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김주영

Kim, Ju-Young
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Indentation size effect for spherical nanoindentation on nanoporous gold

Author(s)
Kim, Young-CheonGwak, Eun-JiAhn, Seung-MinKang, Na-RiHan, Heung NamJang, Jae-ilKim, Ju-Young
Issued Date
2018-01
DOI
10.1016/j.scriptamat.2017.09.002
URI
https://scholarworks.unist.ac.kr/handle/201301/22758
Fulltext
http://www.sciencedirect.com/science/article/pii/S1359646217305171?via%3Dihub
Citation
SCRIPTA MATERIALIA, v.143, pp.10 - 14
Abstract
We find that the indentation size effect (ISE) occurs during spherical indentation on nanoporous gold (np-Au). The hardness increases as the indenter radius decreases at a fixed representative strain. We prepare np-Au samples with a ligament size of 26 nm by free-corrosion dealloying and perform multiple spherical nanoindentations with nominal indenter radii of 4, 12, and 50 μm. A nanomechanics model for the ISE during spherical indentation is developed, and the model accurately describes the hardness depending on the indenter radius. We also correlate the ISE trends of spherical and Berkovich indentations along with their differences in terms of the representative strain and the indentation work.
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
ISSN
1359-6462
Keyword (Author)
Nanoporous goldNanoindentationPorous materialsHardnessIndentation size effect
Keyword
MECHANICAL-PROPERTIESYIELD STRENGTHCATALYTIC-ACTIVITYAUSTRESS

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