About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
|
Symposium
|
Mechanical Behavior at the Nanoscale VI
|
Presentation Title |
Ligament-size Effect of Time-dependent Plasticity in Nanoporous Gold under Controlled Surface Coated Layer |
Author(s) |
Hansol Jeon, Eunji Song, Ju-Young Kim |
On-Site Speaker (Planned) |
Hansol Jeon |
Abstract Scope |
The research on the time-dependent deformation as called “creep” for nanoporous gold (np-Au) is lacking while there have many studies related with time-independent properties like as tension, compression, and nanoindentation. In this study, we investigated spherical nanoindentation creep tests for np-Au with four ligament sizes in addition to surface coating of thin alumina layer. By preparing the np-Au samples without grain boundaries and cracks, we could focus on the creep properties only. We find the ligament-size dependent creep behavior, increase of total creep strain and creep strain rate with increasing ligament size, in the range of 103 nm to 986 nm. After surface coating, creep behavior increased for the ligament sizes ranging from 103 nm to 986 nm, while it decreased for ligament size of 30 nm. We discuss ligament-size dependent creep behavior and effect of surface coating with dominant creep mechanism and dislocation mechanism. |
Proceedings Inclusion? |
Planned: |
Keywords |
Mechanical Properties, Nanotechnology, Surface Modification and Coatings |