|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Mechanical Behavior at the Nanoscale IV
||Surface Effect on the Strength of Nanoporous Gold
||Peng Wu, Hai-Jun Jin
|On-Site Speaker (Planned)
The strength of a small-scale solid increases rapidly with decreasing size, or alternatively, with increasing volume-specific surface area. Its strength also becomes increasingly sensitive to the surface state as size decreases. Such surface-effect has been demonstrated in our previous study (Jin & Weissmuller, Science 2011) that the strength of nanoporous gold (NPG) can be recoverably tuned by electrochemically modifying the surface state. Here we extend this study to NPG with larger ligament sizes (L). To our surprise, the surface-effect does not decreases monotonically with increasing ligament size. The adsorption-induced relative change of flow stress of NPG is roughly a constant (~27%) when L is below ~200 nm, then decreased gradually when L increases from ~200 nm to ~2 mm and diminished as L increases further. It provides a strong evidence that the deformation mechanism changes from surface-mediated to bulk-like processes, when L increases from ~200 nm to ~2 um.
||Planned: Supplemental Proceedings volume