About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Thin Films and Coatings: Properties, Processing and Applications
|
| Presentation Title |
Putting Fatigue to Rest via Solute Pinned Boundaries |
| Author(s) |
Manish Jain, Daniel Vizoso, Alejandro Hinojos, Alejandro Barrios, Kyle R Dorman, Yichen Yang, Khalid Hattar, David P Adams, Douglas Medlin, Olivier Pierron, Remi Dingreville, Brad Boyce |
| On-Site Speaker (Planned) |
Manish Jain |
| Abstract Scope |
Nanocrystalline materials exhibit exceptional fatigue resistance compared to conventional materials owing to smaller grain-size. However, fatigue-induced grain coarsening hinders their performance, and the underlying mechanisms remain elusive. This investigation explores the influence of grain stabilization on the fatigue response of nanocrystalline pure Pt and Pt-Au alloys. A novel high-throughput microresonator technique was implemented for very high-cycle fatigue investigation, complemented by TEM, EBSD, and SEM. The results unveil that grain-stabilized nanocrystalline Pt-10Au demonstrates remarkable fatigue resistance, exhibiting no fatigue even after 10 billion cycles. Atomistic simulations were employed to understand the relative propensity for fatigue-induced microstructural evolution in Pt-Au alloys for varying Au concentration. The atomistic modelling revealed that Au segregation at grain boundaries promotes grain boundary stability under cyclic-loading. This study suggests the possibility of stopping fatigue in metals by suppressing their susceptibility to crack nucleation mechanisms.
Sandia National Laboratories is managed-and-operated by NTESS under DOE-NNSA contract DE-NA0003525. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Thin Films and Interfaces, Characterization, Mechanical Properties |