| About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
|
| Symposium
|
2024 Graduate Student Poster Contest
|
| Presentation Title |
SPG-35: Vacancy Migration and Kirkendall Pore Formation in the Ni-Cr-Al-Ti System |
| Author(s) |
Nicholas A. Simpson, Ugochukwu P. Ochieze, Ashley E. Paz y Puente |
| On-Site Speaker (Planned) |
Nicholas A. Simpson |
| Abstract Scope |
Many subsets of the Ni-Cr-Al-Ti alloy system exhibit an imbalance in diffusion coefficients resulting in Kirkendall pore formation. In this study the Ni-Ti, Ni-Al, Ni-Cr-Al, and Ni-Cr-Ti alloy systems were studied to evaluate the influence of Cr content on vacancy and pore formation. Chromium content was varied in the nickel alloy from 0-20 wt.% Cr and assembled in diffusion couples with both aluminum and titanium. A series of these diffusion couples were annealed at various temperatures for different times. Using Energy Dispersive Spectroscopy (EDS) and Electron Probe Microanalysis (EPMA), concentration profiles were obtained for each diffusion couple made. The amount and location of the Kirkendall porosity that developed in the different systems is reported. This work is compared to previous work involving Ni-based substrates diffusion coated using a process called pack cementation to develop a fundamental understanding on the effects of compositional changes on the Kirkendall behavior in these systems. |