| About this Abstract |
| Meeting |
MS&T23: Materials Science & Technology
|
| Symposium
|
Synthesis, Characterization, Modeling and Applications of Functional Porous Materials
|
| Presentation Title |
Fabricating Nitinol Microtubes via Gas-phase Alloying: A Computational and Experimental Feasibility Study |
| Author(s) |
Sravya Josyula, Ravi Kumar, Ugochukwu P Ochieze, Abdulquadri T Oriola, Eric J Payton, Ashley E Paz y Puente |
| On-Site Speaker (Planned) |
Sravya Josyula |
| Abstract Scope |
Microtubes can be created by interdiffusion of Ti-coated Ni wires through taking advantage of the Kirkendall effect. Pack cementation is traditionally a type of chemical vapor deposition process used to form diffusion coatings. However, it can also be employed as a technique to gas-phase alloy lightweight porous or hollow structures which have a high surface area to volume ratio. NiTi shape memory alloys are renowned for their ductility, corrosion resistance, and biocompatibility making them advantageous in applications from actuators to implant materials. The gas-phase alloying process is simulated for the Ni-Ti system using Pandat, a CALPHAD software. The effects of various diffusion boundary conditions are investigated over a range of temperatures. Experimentally, Ni wire is embedded in a Ti-based pack powder mixture under conditions informed by the simulations. SEM and EDS are used to characterize diffusion depth and rate via concentration profiles and transformation temperatures are measured via DSC. |