| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Nano and Micro Additive Manufacturing
|
| Presentation Title |
In-situ Studies of Surface Oxide Layer Fracture Upon Powder Particles Flattening |
| Author(s) |
Qi Tang, Yuji Ichikawab, Mostafa Hassani |
| On-Site Speaker (Planned) |
Qi Tang |
| Abstract Scope |
Metallic powder particles are often covered with a native oxide layer on their surfaces. Understanding the fracture behavior of the oxide and its influence on particle mechanical behavior is crucial in a number of processes from powder consolidation to cold spray additive manufacturing. However, the small length-scales involved, i.e., ~10 µm for powder particles and ~10 nm for oxide layers make direct observations challenging. Using a barrel-sputtering technique, we fabricated metallic particles with ~30nm-thick oxide coating. We study particle flattening with in-situ deformation of individual powder particles inside a scanning electron microscope. We resolve the process of oxide layer fracture in-situ and discuss a number of cracking modalities involved. We also complement our real-time observations with finite element simulations to develop a physical understanding of the fracture behavior and the strengthening effects of surface oxide layers. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Powder Materials, Mechanical Properties |