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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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Tension-compression asymmetry in plasticity of nanoporous gold

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Title
Tension-compression asymmetry in plasticity of nanoporous gold
Author
Jeon, HansolLee, SukbinKim, Ju-Young
Issue Date
2020-10
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Citation
ACTA MATERIALIA, v.199, pp.340 - 351
Abstract
Tensile and compressive tests are carried out on four nanoporous gold samples with ligament sizes of 56, 149, 402, and 868 nm, all without grain boundaries and with similar number of ligaments regardless of ligament size. We find that tensile yield strengths are greater than compressive yield strengths up to ligament size of 402 nm, while yield strengths are similar in tension and compression for d(L) of 868 nm. The dependence of tensile yield strength on ligament size is described well using a size-effect exponent -1.18 for four samples, whereas bulk-like behavior, i.e. no ligament-size dependency, is observed for ligament size greater than 402 nm in compression; compressive yield strength depending on ligament size is described by a size-effect exponent -1.49 for ligament sizes ranging from 56 nm to 402 nm. The asymmetries in yield strength and plasticity between tension and compression are discussed in terms of the deformation behavior of individual ligaments based on a suggested open-cell model and dislocation activities in the ligaments. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
URI
https://scholarworks.unist.ac.kr/handle/201301/48682
URL
https://www.sciencedirect.com/science/article/pii/S1359645420306613
DOI
10.1016/j.actamat.2020.08.054
ISSN
1359-6454
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