| About this Abstract |
| Meeting |
2022 TMS Annual Meeting & Exhibition
|
| Symposium
|
Mechanical Response of Materials Investigated Through Novel In-Situ Experiments and Modeling
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| Presentation Title |
Dwell Fatigue in Ti Alloys; TEM on Dislocations, HEDM, alpha2-Ti3Al and SAXS |
| Author(s) |
David Dye, Sudha Joseph, Felicity F Dear, Yilun Xu, Rachel E Lim, Thomas P McAuliffe, Joel V Bernier, Darren C Pagan, Phani Karamched, Kate Fox, David Rugg, Fionn PE Dunne |
| On-Site Speaker (Planned) |
David Dye |
| Abstract Scope |
Dwell fatigue has been concerning for >50y and still causes failures which provide interesting insights. High Al contents have long been implicated, through short range ordering and/or the precipitation of Ti3Al causing <a> slip localisation, which can be tracked through SAXS and APT; Ti3Al precipitation may be vacancy-nucleated [Dear et al, Acta Mater 212:116811, 2021]. The existence of long paths for easy <a> slip in critically stressed volumes, e.g. macrozones, is also held to be important, which makes large volume forgings a particular concern. Hypothesis-driven experimentation through the production of samples specifically designed to contain the microstructural feature of concern, is capable of reproducing the large reductions in dwell strength observed in the field [Joseph et al, Int J Plasticity 131:102473, 2020; Xu et al, Nature Commun 11:5868, 2020]. In situ High Energy Diffraction Microscopy on slip avalanches also provides insights into the beneficial role of O vs Al. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Titanium, Mechanical Properties, Characterization |