| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Fatigue in Materials: Fundamentals, Multiscale Characterizations and Computational Modeling
|
| Presentation Title |
Insights on Dwell Debit in a Ti6Al4V Alloy: A Mesoscale Correlational Study |
| Author(s) |
Hanqing Liu, Angus J Wilkinson, Jicheng Gong |
| On-Site Speaker (Planned) |
Hanqing Liu |
| Abstract Scope |
It is well known that the load holding close to the yielding point could significantly degrade the fatigue life in titanium alloys, which is termed the dwell debit. To date, the mechanistic explanation for the dwell debit remains elusive. In this work, in-house fatigue rig was developed, enabling mesoscale dwelling fatigue tests in miniaturized Ti-6Al-4V samples. The bespoke rig was integrated into an advanced SEM, allowing for in-situ observation of dwelling fatigue crack from its incubation with microplastic localization to the initiation, and the subsequent short crack growth. Colloidal silica was dispersed on the sample surface to generate nano-particles for the high-resolution digital image correlation analysis. The results showed that dwell fatigue damages initiated at α/β and α/α boundaries. The micro-strain evolution was correlated with the local crystal features to underpin the strain accumulation from different slip systems and unravel the crack nucleation mechanisms as the applied loading varies. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Titanium, Mechanical Properties, Other |