| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
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Recent Advances in Titanium Science and Technology: MPMD/SMD Symposium Honoring Professor Dipankar Banerjee
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| Presentation Title |
New insights into the transition from microplasticity to fatigue crack nucleation in (α+β) Ti alloys |
| Author(s) |
Cyril Lavogiez, Patrick Villechaise, Azdine Nait-Ali, Christophe Tromas, Florence Hamon, Valery Valle, Biaobiao Yang, Miguel Monclus, Javier Llorca, Djafar Iabadden, Julien Guenole, Samuel Hemery |
| On-Site Speaker (Planned) |
Samuel Hemery |
| Abstract Scope |
The fatigue performance is a critical design property for many aerospace applications of Ti alloys. Preliminary slip activity is generally acknowledged as a critical step due to irreversible deformation eventually leading to fatigue crack formation. A characterization of the onset of plastic deformation using in situ SEM tensile tests and AFM is first reported to highlight the differences in slip strength and localization, and clarify the competition between deformation mechanisms. Recent investigations of fatigue failures highlighted that basal twist grain boundaries (BTGBs) are preferred locations for crack nucleation. A complementary analysis of deformation and fracture at a selection of BTGBs was carried out using in-situ SEM tensile tests combined with HR-DIC. The collected dataset was analyzed to identify features leading to the most critical configurations. The specific behavior was confirmed using micropillar testing. Atomistic simulations were performed to provide additional information about the grain boundary structure, and clarify underlying mechanisms. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Titanium, Mechanical Properties, |