| About this Abstract |
| Meeting |
MS&T22: Materials Science & Technology
|
| Symposium
|
Dynamic Behavior of Materials: Experiments and Molecular Dynamics Simulations
|
| Presentation Title |
A Molecular Dynamics Study of the Effect of an Oxide Layer on the High Velocity Deposition of Tantalum Nanoparticles |
| Author(s) |
Stephen G. Bierschenk, Michael F. Becker, Desiderio Kovar |
| On-Site Speaker (Planned) |
Stephen G. Bierschenk |
| Abstract Scope |
Micro-cold spray is the process of accelerating solid nanoparticles in a gas stream from ~1 atm through a nozzle and impacting them at high velocity onto a substrate in vacuum to deposit nanostructured films of metals and ceramics. Tantalum films deposited by micro-cold spray are desirable because they are non-reactive to certain molten metals. However, tantalum nanoparticles quickly form an oxide layer when exposed to air. Since micro-cold spray uses an order of magnitude smaller particle sizes than traditional cold spray, typically sub-500 nm, this oxide layer can inhibit film deposition. Nanoparticles impacted at velocities up to 1000 m/s can experience strain rates as high as 10^11 s^-1. The effect of this oxide layer on deformation and adherence to a substrate under these high strain rates is studied using molecular dynamics simulations. The effect of oxide layer thickness, particle diameter, and impact velocity will be examined. |