About this Abstract |
Meeting |
2021 TMS Annual Meeting & Exhibition
|
Symposium
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Advances in Titanium Technology
|
Presentation Title |
Colony Orientation Dependence in the Deformation and Spheroidization of Two-Phase Titanium Alloys |
Author(s) |
Benjamin A. Begley, Cameron Frampton, Thomas Spradley, Jennifer Perez, Adam Pilchak, Victoria M. Miller |
On-Site Speaker (Planned) |
Benjamin A. Begley |
Abstract Scope |
The lamellar colony microstructure of two-phase titanium alloys dramatically affects the deformation mechanics as a result of the Burgers orientation relationship (BOR) between the alpha and beta phases, which aligns certain slip systems in each phase to form a stable interface. Thermomechanical processing to break down this microstructure is a critical processing step for many applications. In certain initial colony orientations, plastic deformation promotes rotation away from BOR, increasing the driving force for spheroidization and recrystallization, while other orientations fail to disrupt the BOR. We hypothesize that the orientation dependence of colony breakdown can be predicted by such plastic rotation arguments for a variety of loading schemes (uniaxial compression, plane strain). The viscoplastic self-consistent model is used to examine plastic rotation under various processing parameters, coupled with electron backscattered diffraction and transmission electron microscopy to elucidate the microscale relationships between colony orientation and spheroidization not captured by the model. |
Proceedings Inclusion? |
Planned: |