About this Abstract |
| Meeting |
2027 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in Surface Engineering IX
|
| Presentation Title |
Microscale Hardening and Multi-Physics Modeling of Laser-Nitrided NbTaTiZr MPEAs |
| Author(s) |
Anna K. Rawlings, Mostafa Omar, Eslam Ibrahim, Andrew Birnbaum, Nicole Apetre, Athanasios Iliopoulos, Mitra Taheri |
| On-Site Speaker (Planned) |
Anna K. Rawlings |
| Abstract Scope |
Laser processing creates unique microstructures via rapid solidification. When applied to susceptible alloys, laser nitriding simultaneously modifies microstructure and chemical composition, serving as an effective surface modification technique. This study investigates the micromechanical effects of laser nitriding on a representative NbTaTiZr body-centered-cubic multi-principal element alloy (MPEA). Using nanoindentation mapping and localized micropillar compression, we demonstrate significant hardening throughout the nitrided region, whereas inert laser processing yields limited mechanical enhancement. A multi-physics finite element model was developed to simulate thermal-fluid behavior and nitrogen mass transport, which is then used to optimize the profiles of hardened surfaces of other alloys from the NbTaTiZr alloy system. These simulations incorporate temperature-dependent material properties derived from equilibrium and non-equilibrium CALPHAD thermodynamic calculations. Together, these combined experimental and computational insights establish a robust, data-informed framework for predicting and optimizing localized surface reinforcement and microstructural evolution in advanced additive manufacturing processes. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Surface Modification and Coatings, Solidification, ICME |