About this Abstract |
Meeting |
2024 TMS Annual Meeting & Exhibition
|
Symposium
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Fatigue in Materials: Fundamentals, Multiscale Characterizations and Computational Modeling
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Presentation Title |
Critical Microstructural Features for Fatigue Crack Initiation at Basal Twist Grain Boundaries in Ti Alloys |
Author(s) |
D. Iabbaden, Julien Guénolé, Azdine Nait-Ali, Chris Bean, Jean-Charles Stinville, Joseph Wendorf, Tresa Pollock, Samuel Hemery |
On-Site Speaker (Planned) |
Samuel Hemery |
Abstract Scope |
The fatigue performance is a critical property for numerous aerospace applications of Ti alloys. Basal twist grain boundaries (BTGB) have been recently identified as critical microstructural features regarding fatigue crack initiation in α+β Ti alloys. In this presentation, we report 2D and 3D EBSD characterization of cracked BTGB over representative regions including a statistically meaningful number of observations. Microstructural characteristics were extracted to highlight important features determining the cracking sensitivity. Molecular dynamics simulations were also carried out to obtain additional insights into the atomic scale structure and the fracture strength of these specific grain boundaries as a function of the misorientation. Based on these results, automatic detection routines have been developed to estimate the size of microstructural representative volume element for fatigue crack nucleation. |
Proceedings Inclusion? |
Planned: |
Keywords |
Titanium, Mechanical Properties, Characterization |