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Development of Titanium-Ruthenium-Aluminum Alloys for Aerospace Propulsion Systems

This research project aims to explore the potential of Ti-Ru-Al alloys for high-temperature applications in aerospace propulsion systems, with the goal of replacing Ni-based superalloys. These alloys offer a 30% lower density and a possible 25-35% increase in specific strength. The phase diagram of Ti-Ru-Al alloys is crucial, but there is limited knowledge about their metallurgical characteristics and properties, making it an unexplored area for structural materials. The presence of ruthenium stabilizes the beta phase of titanium, offering stability at high temperatures. Investigation will focus on structural characteristics, stability at high temperatures, mechanical properties versus temperature, and the effects of heat treatment on these alloys.

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Development of Titanium-Ruthenium-Aluminum Alloys for Aerospace Propulsion Systems

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  1. Development Of Titanium-Ruthenium-Aluminum Alloys For High Temperature Applications In Aerospace Propulsion Systems

  2. Develop potential Ti-Ru-Al alloys for hi T applns in aerospace propulsion systems – replace Ni-base superalloys:

  3. Develop potential Ti-Ru-Al alloys for hi T applns in aerospace propulsion systems – replace Ni-base superalloys: Density ~ 30% lower 25-35% increase in specific strength possible

  4. Ti-Ru-Al alloys:

  5. Ti-Ru-Al alloys: • Phase diagram largely determined

  6. Ti-Ru-Al alloys: • Phase diagram largely determined • Little known about metallurgical characteristics or properties

  7. Ti-Ru-Al alloys: • Phase diagram largely determined • Little known about metallurgical characteristics or properties • Essentially unexplored territory with respect to applns as structural materials

  8. Interesting: • Ru - strong -Ti stabilizer…..stable over significant composition range from room temperature to 1550°C minimum

  9. Interesting: • Ordering rxn in Ti-Ru-Al  phase - possible strengthening beyond solid solution strengthening in titanium alloys

  10. Interesting: • Ti-2Ru-18Al alloy may be stable to ~900°C

  11. Interesting: • Ti-2Ru-18Al alloy may be stable to ~900°C • Ti-Ru-Al alloys with only few % Ru can be quenched from 1250°C to several different types of martensites - possible strengthening avenue

  12. Interesting: • Ti-2Ru-18Al alloy may be stable to ~900°C • Ti-Ru-Al alloys with only few % Ru can be quenched from 1250°C to several different types of martensites - possible strengthening avenue • Diffusion rates quite low, even at 1300°C

  13. Interesting: • Ti-2Ru-18Al alloy may be stable to ~900°C • Ti-Ru-Al alloys with only few % Ru can be quenched from 1250°C to several different types of martensites - possible strengthening avenue • Diffusion rates quite low, even at 1300°C • Excellent oxidation resistance

  14. Investigate selected Ti-Ru-Al alloys (0-5% Ru, 0-20% Al; 20-40% Ru, 0-5% Al): • Structural characteristics (optical & electron microscopy & x-ray diffraction)

  15. Investigate selected Ti-Ru-Al alloys (0-5% Ru, 0-20% Al; 20-40% Ru, 0-5% Al): • Structural characteristics (optical & electron microscopy & x-ray diffraction) • Structural stability at hi T

  16. Investigate selected Ti-Ru-Al alloys (0-5% Ru, 0-20% Al; 20-40% Ru, 0-5% Al): • Structural characteristics (optical & electron microscopy & x-ray diffraction) • Structural stability at hi T • Mechanical properties vs. T

  17. Investigate selected Ti-Ru-Al alloys (0-5% Ru, 0-20% Al; 20-40% Ru, 0-5% Al): • Structural characteristics (optical & electron microscopy & x-ray diffraction) • Structural stability at hi T • Mechanical properties vs. T • Effect of heat treatment on structures • & props

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