| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Phase Stability in Extreme Environments II
|
| Presentation Title |
Exceptional Fatigue Strength of a Microstructurally Stable Bulk Nanocrystalline Alloy |
| Author(s) |
Kristopher A. Darling, Raj Koju, B. Chad Hornbuckle, Saurabh Sharma, Yuri Mishin, Kiran Solanki |
| On-Site Speaker (Planned) |
Kristopher A. Darling |
| Abstract Scope |
The long-term safety of structural elements in many advanced applications is paramount, especially under cyclic damage conditions. In most coarse-grained materials, the damage tends to localize under cyclic loading conditions, resulting in low fatigue strength. On the other hand, earlier studies on nanocrystalline alloys show an improved fatigue limit compared to the CG counterparts. However, cyclic deformation mechanisms in such materials remain elusive. Here, a microstructurally stable NC Cu-3at.%Ta alloy is used as a model material to demonstrate exceptional fatigue strength compared to other NC materials in literature and an endurance limit on par with tool steels. Postmortem characterization combined with atomistic simulations reveal the underlying mechanism to be related to diffuse and greatly suppressed damage accumulation. The ability to reach the yield point for fatigue endurance limit is discussed in this context and related to other mutually exclusive properties such as the absence of radiation and shock hardening. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Mechanical Properties, Powder Materials, Characterization |