Nanoparticle Impact 2023 Highlights [Slide]
These images show the strain states for a 50 nm ceramic particle impacting a ceramic substrate at 1200 m/s as a function of time.
36 MATERIALS SCIENCE↗
Engineering topics
Moyers, Aidan Haynes
Publications and source records attributed to Moyers, Aidan Haynes.
Nanoparticle Impact 2023 Report
Micro-cold spray (MCS) is a thermal spray process that can be used to apply thick ceramic films (1-100 μm) using kinetic energy to consolidate aerosolized powders into a dense film. While this process is compatible with many substrates due to the low working temperatures, the fundamental mechanisms that enable MCS and shape the operational window are poorly understood.
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND↗
A strain density function to analyze particle size effects during high velocity impacts of yttria
Here, the impact behavior of a single yttria (Y 2 O 3 ) nanoparticle onto a Y 2 O 3 substrate is studied as a function of particle velocity (300–1200 m/s) and diameter (12–50 nm) using molecular dynamics simulations. To analyze the results, a strain density function is developed to provide both quantitative and qualitative information about the deformation mechanisms that contribute to the final state of the system. This function provides both clear evidence of shear localization and insight into the conditions for which localization occurs during the impact of Y 2 O 3 particles as they approach experimentally relevant sizes. Further analysis shows that localization and fragmentation only occur for Y 2 O 3 impacts with diameters of at least 50 nm, while particles with diameters of 25 nm and smaller deform primarily by amorphization and viscous flow. Implications for the deposition of films of Y 2 O 3 and other rare-earth oxides via the micro cold spray process are discussed.
36 MATERIALS SCIENCE↗