Indentation size effect in nanoporous gold
- Title
- Indentation size effect in nanoporous gold
- Author
- 장재일
- Keywords
- Nanoporous gold; Nanoindentation; Porous materials; Hardness; Indentation size effect
- Issue Date
- 2017-10
- Publisher
- PERGAMON-ELSEVIER SCIENCE LTD
- Citation
- ACTA MATERIALIA, v. 138, page. 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. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
- URI
- https://www.sciencedirect.com/science/article/abs/pii/S135964541730602X?via%3Dihubhttps://repository.hanyang.ac.kr/handle/20.500.11754/115984
- ISSN
- 1359-6454; 1873-2453
- DOI
- 10.1016/j.actamat.2017.07.040
- Appears in Collections:
- COLLEGE OF ENGINEERING[S](공과대학) > MATERIALS SCIENCE AND ENGINEERING(신소재공학부) > Articles
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