|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Materials for High Temperature Applications: Next Generation Superalloys and Beyond
||Design and Production of bcc Titanium-molybdenum-based Alloys Strengthened by Ordered Intermetallic Precipitates
||Alexander Knowles, Nick Jones, Neil Jones, Howard Stone, David Dye
|On-Site Speaker (Planned)
Reinforcement of alloys with ordered intermetallic precipitates is an effective strategy for obtaining high strengths alongside damage tolerance, exemplified by nickel-based superalloys. There has been a desire to exploit this strategy in bcc-based systems; with success in some maraging steels. However, design and production challenges have limited the utilisation of ordered intermetallic precipitates within refractory-metal-based or titanium-based alloys. This work has developed alloys with a bcc (A2) titanium-molybdenum matrix strengthened by B2 structured TiFe ordered intermetallic precipitates, by two-step heat treatments. Instructed by study of the phase equilibria in the Ti-Fe-Mo system, alloys were designed within the extensive A2-B2 phase field. Detailed characterisation showed that these contained ultra-fine A2-B2 microstructures, while compression testing has demonstrated exceptional strengths. The prospects for extending the capability of these alloys to higher temperatures will be discussed. This work was supported through the EPSRC-DARE project (EP/L025213/1) and Rolls-Royce/EPSRC Strategic Partnership (EP/H022309/1 and EP/H500375/1).