| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Designing Complex Microstructures through Additive Manufacturing
|
| Presentation Title |
A site-specific study of complex heterogeneous microstructure evolution during
high-velocity metallic microparticle impact |
| Author(s) |
Ahmed Alade Tiamiyu |
| On-Site Speaker (Planned) |
Ahmed Alade Tiamiyu |
| Abstract Scope |
The study of high-velocity microparticle impact behavior of materials is of significant interest due to its many applications, including asteroid strikes in planetary applications, explosive welding, shaped charges, and cold spray. However, such impact events are difficult to capture due to the length- and time- scales involved; and also, the associated complex heterogeneous microstructural evolutions are challenging to study due to the extremely large strains and strain-rates accompanying the impact process. These challenges are overcome by using a laser-induced particle impact tester to launch single copper-microparticles at impact velocities up to and above 1 km/s. The in-situ videography and post-mortem characterization together provide the first site-specific observation of extrinsic (particle flattening, jetting, and oxide-layer delamination) and intrinsic phenomena that set on. This talk will cover the intrinsic observations: the transition from dislocation-based plasticity and recrystallization to a nanotwin-assisted recrystallization mechanism, and back to dominant dislocation-mediated mechanism as impact velocity increases. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Powder Materials, Characterization |