About this Abstract |
| Meeting |
MS&T26: Materials Science & Technology
|
| Symposium
|
Controlled Synthesis, Processing, and Applications of Structural and Functional Nanomaterials
|
| Presentation Title |
Time-Dependent Mechanical Behavior of Nanoporous Gold Depending on Ligament Size |
| Author(s) |
Younghoon Kim, Sukwon Hong, Hansol Jeon, Ju-Young Kim |
| On-Site Speaker (Planned) |
Younghoon Kim |
| Abstract Scope |
Nanoporous gold, a bicontinuous network of ligaments and pores, is a lightweight, high-strength structural and functional material. For practical applications, understanding its mechanical response under both static and dynamic loading conditions is essential. Strain rate sensitivity (m) reflects the dependence of flow stress on strain rate and is useful for probing deformation mechanisms. In nanoscale metals, reduced characteristic length can shift deformation from dislocation multiplication to dislocation nucleation, increasing m. Because ligament size is the characteristic length scale in nanoporous gold, m is expected to depend strongly on ligament size. In this study, nanoporous gold was fabricated by dealloying of an Au–Ag precursor alloy and subsequently annealed to coarsen the ligaments. Uniaxial compression tests were performed at strain rates from 8.66 × 10⁻⁶ s⁻¹ to 1 × 10⁻² s⁻¹. The results provide insight into ligament-size-dependent strain rate sensitivity and the associated dislocation behavior in nanoporous gold. |