| About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
|
| Symposium
|
Grain Boundaries, Interfaces, and Surfaces: Fundamental Structure-Property-Performance Relationships
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| Presentation Title |
Billion-Cycle Fatigue Endurance Enabled via Grain Boundary Stabilization |
| Author(s) |
Manish Jain, Daniel Vizoso, Alejandro Hinojos, Alejandro Barrios, Kyle Dorman , David Adams, Douglas Medlin, Remi Dingreville, Olivier Pierron, Brad Boyce |
| On-Site Speaker (Planned) |
Manish Jain |
| Abstract Scope |
Nanocrystalline materials exhibit exceptional resistance to fatigue compared to conventional materials owing to their smaller grain size. However, fatigue-induced grain coarsening hinders their performance. 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 transmission electron microscopy, electron-backscatter diffraction. The results unveil that grain-stabilized nanocrystalline Pt-10Au demonstrates remarkable fatigue resistance, exhibiting no fatigue even after 10 billion cycles. Atomistic simulations were also 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 fatigue behavior of nanocrystalline materials and underscores the significance of preserving nanocrystalline grain structures.
Sandia National Laboratories is managed and operated by NTESS under DOE-NNSA contract DE-NA0003525. |