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Meeting 2026 TMS Annual Meeting & Exhibition
Symposium Advances in Titanium Technology
Presentation Title Paired Analysis of Crack Initiation Sites in Dwell-Fatigued α/β Titanium Alloys
Author(s) Baris Yavas, Nadib Akram, Asa Frye, Christopher Collins, Michael Gram, Adam Pilchak, David Furrer, Iuliana Cernatescu, Mark Aindow
On-Site Speaker (Planned) Baris Yavas
Abstract Scope Recent studies suggest that basal twist grain boundaries (BTGBs), formed between suitably oriented primary α grains, may play a key role in fatigue crack nucleation in α/β Ti alloys. While shear localization at such boundaries has been observed, the mechanisms remain unclear. This work investigates matched pairs of crack initiation sites in dwell-fatigued test samples. Crack initiation locations, characterized by featureless facets inclined to the loading axis, were identified using optical and scanning electron microscopy. Site-specific transmission electron microscopy specimens were prepared via focused ion beam milling. This approach enables a direct comparison of both sides of the same crack initiation site. The study explores differences in defect structures within each grain, local misorientation between crack initiation sites and adjacent grains, and the characteristics of the initiating boundary. These insights contribute to a deeper understanding of BTGB-mediated crack initiation in titanium alloys under dwell fatigue conditions.
Proceedings Inclusion? Planned:
Keywords Titanium, Characterization, Mechanical Properties

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