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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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Twinned nanoporous gold with enhanced tensile strength

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Title
Twinned nanoporous gold with enhanced tensile strength
Author
Gwak, Eun-JiJeon, HansolSong, EunjiKang, Na-RiKim, Ju-Young
Issue Date
2018-08
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Citation
ACTA MATERIALIA, v.155, pp.253 - 261
Abstract
Enhancing tensile strength is crucial to increasing the applicability of nanoporous materials including nanoporous gold (np-Au) that show mechanical weakness because of their nanoporous structure despite other superior characteristics. We fabricated twinned and textured np-Au foils with an average twin spacing of 7.9 nm. The foils exhibit an ultimate tensile strength (UTS) of 87.5 MPa when the loading axis is normal to the twin boundaries. This UTS value is approximately three times greater than that for np-Au with rare twins of 27.4 MPa. The high UTS can be ascribed to the twin boundaries acting as effective barriers to dislocation slip, resulting in the strain-hardening of the load-bearing ligaments. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
URI
https://scholarworks.unist.ac.kr/handle/201301/24211
URL
https://www.sciencedirect.com/science/article/pii/S1359645418304774?via%3Dihub
DOI
10.1016/j.actamat.2018.06.009
ISSN
1359-6454
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