期刊
ACTA MATERIALIA
卷 138, 期 -, 页码 52-60出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2017.07.040
关键词
Nanoporous gold; Nanoindentation; Porous materials; Hardness; Indentation size effect
资金
- National Research Foundation of Korea (NRF) - Ministry of Science, ICT & Future Planning (MSIP) [NRF-2015R1A5A1037627]
- KIST-UNIST partnership program [1.160097.01/2.160482.01]
- National Research Foundation of Korea (NRF) - Korea goverment (MSIP) [NRF-2017R1C1B2009329]
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.
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