| About this Abstract |
| Meeting |
2022 TMS Annual Meeting & Exhibition
|
| Symposium
|
Mechanical Response of Materials Investigated Through Novel In-Situ Experiments and Modeling
|
| Presentation Title |
Integrated Discrete Dislocation Plasticity Modelling, HR-EBSD and TEM Characterisation of Ti Dwell Fatigue |
| Author(s) |
Yilun Xu, Sudha Joseph, Phani Karamchad, David Dye, Fionn Patrick Dunne |
| On-Site Speaker (Planned) |
Fionn Patrick Dunne |
| Abstract Scope |
Dwell fatigue mechanisms in Ti alloy IMI834 have been investigated using discrete dislocation plasticity (DDP) modelling of a novel sample comprising neighbouring textured regions aligned well and badly respectively for slip to reflect micro-textured regions observed in components. New thermo-mechanical DDP capability [1] to model the sample microstructure under dwell fatigue loading has provided quantitative analysis of prism slip pile-ups at hard/soft grain boundaries, developing stresses high enough to activate basal slip in the neighbouring hard grain region. HR-EBSD has provided elastic strains and hence stresses at the experimentally characterised hard/soft interface. TEM analysis has provided quantitative detail of the dislocation slip activation and pile-ups at the interface [2]. Direct comparison of model results with both EBSD and TEM quantitative characterisation has justified a predictive modelling method for dwell fatigue lifetime.
[1] Xu, Y, et al. Intl. Jnl. Plasticity. https://doi.org/10.1016/j.ijplas.2020.102753.
[2] Xu, Y, et al. Nature Comms. https://doi.org/10.1038/s41467-020-19470-w. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Titanium, Mechanical Properties, Modeling and Simulation |