|About this Abstract
||2020 TMS Annual Meeting & Exhibition
||Characterization of Minerals, Metals and Materials
||In-Situ X-ray Tomography of Vapor Phase Alloying of Ni Wires via Pack Titanization
||Arun J. Bhattacharjee, Ashley Paz y Puente, Dinc Erdeniz, David C Dunand
|On-Site Speaker (Planned)
||Arun J. Bhattacharjee
Pack cementation is a type of chemical vapor deposition process where the substrate is buried in a powder mixture containing a halide activator, a source metal to be deposited, and an inert filler. After depositing a sufficient amount of titanium on Ni wires (50-100 µm diameter), and subsequent homogenization, shape memory NiTi microtubes can be created by taking advantage of the radial symmetry and spatial confinement and harnessing the Kirkendall effect. However, to be able to tailor the Kirkendall pores, their formation and evolution mechanisms must be fully understood. Because the pores start developing during the vapor phase deposition process itself, in situ X-ray tomography experiments were used to provide a 4D spatio-temporal visualization of the samples throughout the pack titanization and homogenization heat treatments. Using this tomography based approach in conjunction with traditional ex situ metallography has proven to be an effective method to perform such rapid diffusion studies.