About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
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Symposium
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Fatigue in Materials: Fundamentals, Multiscale Characterizations and Computational Modeling
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Presentation Title |
From Slip Activity to Fatigue Crack Nucleation at Basal Twist Grain Boundaries in Titanium Alloys |
Author(s) |
Cyril Lavogiez, Patrick Villechaise, Jean-Charles Stinville, Fulin Wang, Marie-Agathe Charpagne, Meghan Emigh, Tresa M. Pollock, Valery Valle, Samuel Hemery |
On-Site Speaker (Planned) |
Samuel Hemery |
Abstract Scope |
Titanium alloys are widely employed in the aerospace industry. The operation of aircrafts implies that components are generally subjected to cyclic mechanical loadings. Accurate fatigue lifetime prediction capabilities are then needed. Significant progress in this direction are offered by microstructure sensitive modeling approaches, which rely on the identification of the underlying mechanisms. In this presentation, a few examples of microstructural configurations associated with crack nucleation will be given to assess the influence of loading conditions, alloy composition and microstructural features. Details of the elementary processes involved in crack nucleation will then be presented. Investigations were carried out using in-situ tensile testing combined with high resolution DIC, EBSD and TEM. This approach enabled to identify specific features exhibited by basal twist grain boundaries to be candidates for crack nucleation. The transition from localized plasticity to crack formation at these microstructural configurations will finally be discussed in light of these results. |
Proceedings Inclusion? |
Planned: |
Keywords |
Titanium, Mechanical Properties, Characterization |