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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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Microstructural effect on time-dependent plasticity of nanoporous gold

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Title
Microstructural effect on time-dependent plasticity of nanoporous gold
Author
Kang, Na-RiGwak, Eun-JiJeon, HansolSong, EunjiKim, Ju-Young
Issue Date
2018-10
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Citation
INTERNATIONAL JOURNAL OF PLASTICITY, v.109, pp.108 - 120
Abstract
Annealed, prestrained, and ball-milled nanoporous gold (np-Au) samples were prepared. Since the microstructures of the precursor alloys, such as the crystallographic orientation and grain size, were mostly preserved during the dealloying process, prestrained np-Au is believed to have higher initial dislocation density, and ball-milled np-Au is believed to have higher densities of initial dislocation and grain boundary comparing to annealed np-Au. The time-dependent deformation behavior of np-Au samples with various microstructures was characterized with two parameters; creep strain exponent n and activation volume V∗ using spherical nanoindentation creep tests. We found that primary mechanism of time-dependent plasticity for annealed and prestrained np-Au samples is dislocation slip and that for ball-milled np-Au sample is grain boundary sliding. In dislocation slip-dominant time-dependent deformation in np-Au, a higher initial dislocation density lowers n and V∗. In grain boundary sliding-dominant time-dependent deformation in np-Au, the values of n and V∗ are similar to those for dislocation slip-dominant time-dependent deformation; however, the creep strain rate in quasi-steady-state is higher than that for dislocation slip-dominant time-dependent deformation.
URI
https://scholarworks.unist.ac.kr/handle/201301/24216
URL
https://www.sciencedirect.com/science/article/pii/S0749641918301098?via%3Dihub
DOI
10.1016/j.ijplas.2018.05.011
ISSN
0749-6419
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