Indentation size effect in nanoporous gold
- Authors
- Kim, Young-Cheon; Gwak, Eun-Ji; Ahn, Seung-min; Jang, Jae-il; Han, Heung Nam; Kim, Ju-Young
- Issue Date
- Oct-2017
- Publisher
- PERGAMON-ELSEVIER SCIENCE LTD
- Keywords
- Nanoporous gold; Nanoindentation; Porous materials; Hardness; Indentation size effect
- Citation
- ACTA MATERIALIA, v.138, pp.52 - 60
- Indexed
- SCIE
SCOPUS
- Journal Title
- ACTA MATERIALIA
- Volume
- 138
- Start Page
- 52
- End Page
- 60
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/18738
- DOI
- 10.1016/j.actamat.2017.07.040
- ISSN
- 1359-6454
- 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.
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