Development of a 900 F Titanium Alloy.
Final rept. May 71-Sep 72,
RMI CO NILES OHIO RESEARCH AND DEVELOPMENT DEPT
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The goal was to achieve an improved combination of elevated temperature properties, particularly high elevated temperature tensile strength. The alloy Ti-5Al-5Sn-2Zr-4Mo-0.25Si comes close to meeting the objectives of the contract. This alloy has the capability of achieving 120 ksi 900 F yield strength and high creep strength. At a creep exposure of 1000 F and 55 ksi for 96 hours the alloy has a permanent deformation of -0.23 percent. It also shows good stability as determined by post-creep ductility. Additional thermo-mechanical treatments show promise for improving the high-temperature properties further. Various alloying elements were studied in the investigation. Author Modified Abstract
- Metallurgy and Metallography