| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Mechanical Response of Materials Investigated Through Novel In-Situ Experiments and Modeling
|
| Presentation Title |
Billion-cycle fatigue endurance enabled via grain boundary stabilization |
| Author(s) |
Manish Jain, Daniel Vizoso, Alejandro Hinojos, Alejandro Barrios, Kyle Dorman, Yichen Yang, David 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. To understand the mechanism behind the enhanced fatigue resistance, 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 offers valuable-insights into the fatigue behavior of nanocrystalline materials
Sandia National Laboratories is managed-and-operated by NTESS under DOE-NNSA contract DE-NA0003525 |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Characterization, Mechanical Properties, Thin Films and Interfaces |