|About this Abstract
||2023 TMS Annual Meeting & Exhibition
||Advances in Titanium Technology
||Towards a Single Crack Nucleation Mechanism Involving Basal Twist Grain Boundaries in Ti Alloys
||Cyril Lavogiez, Clement Dureau, Patrick Villechaise, Yves Nadot, Samuel Hemery
|On-Site Speaker (Planned)
Titanium components employed in the aerospace industry generally experience fatigue loadings during in-service operation. Intense research efforts were put into the understanding of crack formation mechanisms to enable accurate prediction of the fatigue performance. However, literature review reveals an intricate situation owing to the competition between different mechanisms. In this presentation, a brief overview of microstructural features found at crack initiation sites in a variety of alloys with different microstructures and loading conditions will be reported first. Based on additional experimental data collected using a dedicated experimental campaign including low-cycle fatigue, high-cycle fatigue and low-cycle dwell-fatigue, the occurrence of a single crack nucleation mechanism involving (0001) twist grain boundaries will be demonstrated. In addition to loading conditions, the influence of composition and microstructural features will be discussed. Finally, a criterion to identify candidates for crack initiation and details of the elementary mechanisms governing fatigue crack formation will be presented.
||Titanium, Mechanical Properties,