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. Density ~ 30% lower 25-35% increase in specific strength possible

4. Ti-Ru-Al alloys:

5. 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