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Kim, Ju-Young
Robust Multifunctional Materials Lab
Research Interests
  • Flexible / stretchable devices, nano-mechanics, nanoporous metal, materials reliability

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Compressive Properties of Nanoporous Gold Through Nanoindentation: An Analytical Approach Based on the Expanding Cavity Model

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Title
Compressive Properties of Nanoporous Gold Through Nanoindentation: An Analytical Approach Based on the Expanding Cavity Model
Author
Kwon, Oh MinKim, JiyeonLee, JinwooKim, Jong-hyoungAhn, Hee-JunKim, Ju-YoungKim, Young-CheonKwon, Dongil
Issue Date
2020-05
Publisher
KOREAN INST METALS MATERIALS
Citation
METALS AND MATERIALS INTERNATIONAL
Abstract
We investigated the analytic relation between hardness and compressive yield stress using an expanding cavity model (ECM) for nanoporous gold (np-Au). We prepared three np-Au samples with ligament sizes 30.61, 59.36 and 116.33 nm by free-corrosion dealloying and post heat treatment. The indentation contact morphology was examined to estimate the hardness accurately from the nanoindentation load-depth curve. Unlike conventional dense metals, the deformation was confined to the projected contact area, and the center of the residual impression was dominated by densification. The projected contact area estimated by the Oliver-Pharr method was overestimated, so that a new contact area function was proposed that considered the indentation contact morphology of np-Au. It was confirmed that a hardness value taking into account the indentation contact morphology of np-Au matches well with the hardness derived by direct measurement of the residual impression. We modeled the ratio of hardness to compressive yield stress for np-Au using an ECM. The scaling factors, which represent the extra strain-hardening in the core in the ECM, were analyzed for np-Au and dense metals. An ECM that better matches np-Au is suggested based on the scaling factor resulting from densification beneath the indenter.
URI
https://scholarworks.unist.ac.kr/handle/201301/32333
URL
https://link.springer.com/article/10.1007%2Fs12540-020-00740-7
DOI
10.1007/s12540-020-00740-7
ISSN
1598-9623
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MSE_Journal Papers
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