|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Advances in Titanium Technology
||The Influence of Fe and Al on the Microstructure and Mechanical Performance of Ti-Cr Alloys
||Joann Ballor, Jonathan Poplawsky, Elizabeth Kautz, Bharat Gwalani, Arun Devaraj, Alexandra Zevalkink, Scott T Misture, Masahiko Ikeda, Carl J Boehlert
|On-Site Speaker (Planned)
The low-cost alloying elements Fe and Al were added to a base Ti-13Cr(wt.%) alloy, and a multi-modal investigation was conducted to determine their effects on the microstructure and mechanical performance after subjecting the alloys to 400C heat treatments. Transmission Electron Microscopy and in-situ X-ray Diffraction, performed at 400C, revealed the evolution of the phases and the resulting microstructures. The beta phase transformed to the omega and alpha phases in the Ti-13Cr alloy, while the 1Fe(wt.%) and 3Al(wt.%) additions tended to suppress the formation of the omega phase but not the alpha phase. Atom probe tomography indicated elemental segregation during the phase transformations, suggesting diffusional pathways. Room temperature tensile tests revealed exceptional strengthening after the 400C treatment, and the Ti-13Cr-1Fe-3Al(wt.%) alloy exhibited the best balance of strength and ductility. 400C in-situ Resonant Ultrasound Spectroscopy measurements revealed the evolution of the elastic modulus, consistent with the phase transformations.
||Titanium, Phase Transformations,