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

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Presentation transcript:

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

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

Ti-Ru-Al alloys:

Phase diagram largely determined

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

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

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

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

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

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

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

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

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)

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

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

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