| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Phase Transformations and Microstructural Evolution
|
| Presentation Title |
Defect Assisted Growth of Fine Scale Alpha in Titanium Alloys |
| Author(s) |
Abigail Ackerman, Benjamin H Savitzky, Colin Ophus, Mohsen Danaie, Phani Karamched, Angus Wilkinson, David Rugg, David Dye |
| On-Site Speaker (Planned) |
Abigail Ackerman |
| Abstract Scope |
Ti-6246 is a titanium alloy used in the intermediate pressure compressor of a gas turbine engine, due to its high strength to weight ratio and specific fatigue strength. Its strength benefit is thought to be due to its microstructure; multi orientated primary alpha laths within a beta matrix, with finer secondary alpha laths between.
By increasing the dislocation content via processing, secondary alpha can be encouraged to nucleate from dislocations within the beta matrix, forming finer laths. Here, tensile, low cycle fatigue, high cycle fatigue and corner crack testing is used to show that this finer microstructure is superior to the as received material.
Additionally, in situ heating in the TEM is used to show that nucleation is occurring within the beta matrix, with TKD showing that all 12 alpha variants are still present. Finally, CBED is used to show the evolving strain as this phase grows. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |