|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Advances in Titanium Technology
||Microstructure Formation in Titanium Alloys
||Abigail Ackerman, Benjamin Savitzky, Colin Ophus, Mohsen Danaie, Phani Karamched, David Dye
|On-Site Speaker (Planned)
Titanium alloys often have complex microstructures that form due to intricate thermomechanical processing. By understanding the fundamental microstructural formation mechanisms, changes to the processing can be applied to create an advantageous microstructure. Ti 6246 (6Al-2Sn-4Zr-6Mo wt%) is a titanium alloy that is used in the intermediate pressure compressor of jet engines, in a condition with basketweave Ám-scale primary hcp α-Ti laths in a matrix of bcc β-Ti reinforced by smaller secondary α. Lengthscale strengthening by the secondary α is believed to be the main source of strength in the alloy, providing a barrier against slip band formation, which can be deleterious for the fatigue performance. Here, we use kinetic and interface modelling to understand the microstructural formation, and apply changes to the processing route to encourage defect assisted nucleation. Mechanical testing shows a stronger more fatigue resistant alloy, with advanced microscopy providing a fundamental explanation for the improved properties.
||Titanium, Phase Transformations, Characterization