About this Abstract |
Meeting |
MS&T21: Materials Science & Technology
|
Symposium
|
Additive Manufacturing of Metals: Microstructure, Properties and Alloy Development
|
Presentation Title |
Oxide Layer Delamination during Single Cu Microparticle Impacts at High-velocity |
Author(s) |
Ahmed Alade Tiamiyu, Yuchen Sun, Keith A Nelson, Christopher A Schuh |
On-Site Speaker (Planned) |
Ahmed Alade Tiamiyu |
Abstract Scope |
Cold-spray additive manufacturing is a solid-state layer-by-layer deposition of microparticles at high velocity to form coatings on a substrate. A significant concern in this process is the presence of native surface oxide layers on metallic particles. A well-accepted requirement for permanent particle adhesion is that surface oxides must be removed to permit clean metal-metal contact. Using a laser-induced particle impact tester, we conduct direct optical observations of single Cu microparticle impacts on a polished Cu substrate and characterize impact sites to seek evidence for oxide layer fracture and disruption at experimentally controlled impact velocities. We observe that the surface oxide layer of the particle delaminates upon impact at the same range of velocities where substrate jetting occurs. We further show that such delamination process involves energy dissipation during impact that consumes about 30% of the extra energy expended beyond the plasticity of the impact. |