|About this Abstract
||Materials Science & Technology 2020
||Synthesis, Characterization, Modeling and Applications of Functional Porous Materials
||Compositional Influence on Kirkendall Pore Formation during Fabrication of Gamma Prime Strengthened Superalloy Microtubes
||Haozhi Zhang, Ashley Paz y Puente
|On-Site Speaker (Planned)
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.