About this Abstract |
Meeting |
2020 TMS Annual Meeting & Exhibition
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Symposium
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Purveyors of Processing Science and ICME: A SMD Symposium to Honor the Many Contributions of Taylan Altan, Wei Tsu Wu, Soo-Ik Oh, and Lee Semiatin
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Presentation Title |
The Role of Plastic Rotation in the Breakdown of Colony Microstructures in Two Phase Titanium Alloys |
Author(s) |
S. Keith Markham, Mayo Mizak, Adam L Pilchak, Victoria M. Miller |
On-Site Speaker (Planned) |
Victoria M. Miller |
Abstract Scope |
The breakdown of the lamellar colony structure during the thermomechanical processing of two-phase titanium alloys is a critical step of primary processing. The alpha and beta phases of lamellar microstructures in titanium have a Burgers orientation relationship (BOR), which closely aligns several slip systems in each phase. Depending on the initial colony orientation, this alignment may cause both phases to rotate in the same direction hence preserving the BOR and potentially stymying spheroidization of the alpha phase and recrystallization of the beta phase. In other instances, plastic deformation causes rotation away from the BOR, which should enhance spheroidization kinetics. In this work, we hypothesize that the propensity for breakdown of the colony structure can be predicted by plastic rotation arguments. The viscoplastic self-consistent model is used to examine this hypothesis and results are compared to colony breakdown studies from literature. |
Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |