Abstract
The mechanical stability of nanoporous gold (np-Au) at various stages of thermal coarsening is studied via finite element analysis under volumetric compression using np-Au architectures imaged via X-ray nano-tomography. As the np-Au is coarsened thermally over ligament sizes ranging from 185 to 465 nm, the pore volume fraction is determinant for the mechanical stability of the coarsened np-Au, unlike the curvature and surface orientation of the ligaments. The computed Young's modulus and yield strength of the structures are compared with the Gibson-Ashby model. The geometry of the structures determines the locations where stress concentrations occur at the onset of yielding.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 96-99 |
| Number of pages | 4 |
| Journal | Scripta Materialia |
| Volume | 115 |
| DOIs | |
| State | Published - Apr 1 2016 |
Funding
This research was supported by the Dongbu Cultural Foundation . The X-ray nano-tomography data were originally collected at Advanced Photon Source (APS) as detailed in Ref. [14] . Use of APS is supported by the US Department of Energy, Office of Science, Office of Basic Energy Sciences , under contract no. DE-AC02-06CH11357 .
Keywords
- Coarsened nanoporous gold
- Finite element (FE) analysis
- Mechanical stability
- Surface characteristics
- Volume fraction
ASJC Scopus subject areas
- General Materials Science
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering
- Metals and Alloys