| About this Abstract |
| Meeting |
Materials Science & Technology 2020
|
| Symposium
|
Synthesis, Characterization, Modeling and Applications of Functional Porous Materials
|
| Presentation Title |
Compositional Influence on Kirkendall Pore Formation during Fabrication of Gamma Prime Strengthened Superalloy Microtubes |
| Author(s) |
Haozhi Zhang, Ashley Paz y Puente |
| On-Site Speaker (Planned) |
Haozhi Zhang |
| Abstract Scope |
Hollow superalloys provide several advantages, but are difficult to fabricate, particularly on the micro-scale. The Kirkendall effect offers a novel route to produce such hollowed micro-objects using an inside-out diffusion approach instead of traditional template-removal methods. By depositing the desired alloying additions on Ni-based wires via a chemical vapor deposition technique called pack cementation, multi-component microtubes can be fabricated by taking advantage of the radial symmetry and spatial confinement present within the structure, which under the appropriate annealing conditions, leads to the formation of a central, continuous Kirkendall channel internally throughout the wire, converting it into a microtube. The influence of various alloying additions and processing conditions on the Kirkendall pore formation and evolution will be discussed here. Finally, de-alloying via reversing the pack cementation process was used in an attempt to tailor the composition to achieve the precipitation strengthened γ/γ’ microstructure and the desired hollow geometry simultaneously. |