| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Spatially Tailored Materials: Processing-Structure-Properties
|
| Presentation Title |
Thermal Stability and Microstructural Evolution in Compositionally Graded Refractory Alloys |
| Author(s) |
Benjamin Ellyson, Jennie Glerum, Michael Juhasz, Raiyan Seede, Kaila Bertsch |
| On-Site Speaker (Planned) |
Benjamin Ellyson |
| Abstract Scope |
This study investigates the thermal stability and microstructural evolution of refractory functionally graded materials (FGMs) produced via directed energy deposition (DED), focusing on binary gradients from pure Ti to Ta. Conventional joining techniques often create discrete interfaces that can be detrimental under thermal loading. In contrast, FGMs offer a gradual composition transition, enhancing performance in high-temperature applications like rocket nozzles or turbine engine hot sections without sacrificing weight or structural performance. SEM, EBSD, EDS, and in-situ heating synchrotron XRD were used to analyze microstructural changes and phase transformations at elevated temperatures. The results demonstrated thermal stability of the macroscopic gradient, with interlayer interfaces persisting when intra-layer microstructures were homogenized. These findings provide critical insights for optimizing FGM processing and design for improved performance and reliability in elevated-temperature environments.
Prepared by LLNL under Contract DE-AC52-07NA27344 and supported by the Laboratory Directed Research and Development Program under project tracking code 23-ERD-034 |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Phase Transformations, High-Temperature Materials |