Microstructural effect on time-dependent plasticity of nanoporous gold
Cited 0 times inCited 0 times in
- Microstructural effect on time-dependent plasticity of nanoporous gold
- Kang, Na-Ri; Gwak, Eun-Ji; Jeon, Hansol; Song, Eunji; Kim, Ju-Young
- Issue Date
- PERGAMON-ELSEVIER SCIENCE LTD
- INTERNATIONAL JOURNAL OF PLASTICITY, v.109, pp.108 - 120
- 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.
- Appears in Collections:
- MSE_Journal Papers
- Files in This Item:
- There are no files associated with this item.
can give you direct access to the published full text of this article. (UNISTARs only)
Show full item record
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.