About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
|
Heterostructured and Gradient Materials (HGM V): New Mechanistic Discoveries Enabling Superior Properties
|
Presentation Title |
Gradient Bulk Nanostructures with Exceptional Strength via High Load Sliding |
Author(s) |
Darcy Anne Hughes |
On-Site Speaker (Planned) |
Darcy Anne Hughes |
Abstract Scope |
Plowing of tailored wedge shaped micro-asperities along the surface of Cu induces steep gradients with increasing subsurface depth that include size scales from 3.5 nm to 150,000 nm with a high hardness of 3.4 GPa at the finest scale. substructural gradients are measured with transmission electron microscopy. Microprobe and STEM show that the nanoscale structure is stabilized by Fe.Subsurface stresses are calculated based on the measured structural parameters in a linear addition of the Hall-Petch formulation for the inverse spacing of geometrically necessary boundaries, 〖1/D〗avGNB, plus Taylor dislocation hardening, ρavIDB . A further unification of these parameters is made since the density ρavIDB is directly proportional to〖1/D〗avGNB. A quantitative energy balance between the friction and deformation energies corroborate the high hardness for application to hard components and metal processing. |
Proceedings Inclusion? |
Planned: |
Keywords |
Characterization, Mechanical Properties, Copper / Nickel / Cobalt |