About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Thin Films and Coatings: Properties, Processing and Applications
|
| Presentation Title |
Composition-Guided Engineering of Growth Twins in Ni-Cr-Fe Thin Films Through Coupled Atomistic Deposition Simulations and In-Situ TEM |
| Author(s) |
Mohammad Hadi Yazdani, Aoyan Liang, Ashley J. Maldonado Otero, Yi Liu, Diana Farkas, Andrea M. Hodge, Timothy J. Rupert, Irene J. Beyerlein, Paulo S. Branicio |
| On-Site Speaker (Planned) |
Mohammad Hadi Yazdani |
| Abstract Scope |
Growth twins are a potent route to strengthen face-centered-cubic coatings, yet their density is hard to tune during deposition. We couple large-scale molecular-dynamics (MD) deposition simulations with magnetron-sputtering experiments to build a composition-microstructure map for Ni-Cr, Ni-Fe and Ni-Cr-Fe thin films. MD predicts that Cr or Fe additions progressively lower stacking-fault and twin-boundary energies, driving a transition from sparse twins in pure Ni to sub-5 nm twin networks in Cr-rich alloys. High resolution transmission-electron microscopy validates these trends and reveals right-skewed log-normal twin-spacing distributions whose modal spacing scales linearly with the simulated stacking-fault energy. Integrating energetics and distributions yields a predictive contour chart linking alloy chemistry to mean twin spacing at industrial deposition rates. This framework offers actionable guidelines for designing mechanically robust Ni-based coatings and demonstrates a transferable MD-TEM strategy for microstructure-by-design in functional thin films. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Other, Other, Other |