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Research to Conduct an Exploratory Experimental and Analytical Investigation of Alloys
Final rept. Apr 1979-Aug 1980
PRATT AND WHITNEY WEST PALM BEACH FL GOVERNMENT PRODUCTS DIV
Pagination or Media Count:
Alloys based on the TiAl Gamma and Ti3Al alpha-two intermetallic phases have attractive elevated temperature properties for gas turbine applications. However, certain processing and property problems will have to be overcome before such materials are qualified for the projected applications. The current program evaluated processing and heat treatments for three alpha-two and three gamma alloys. The basic compositions were Ti-Al-Nb V and Ti-Al-V, respectively. The effect of various interstitial elements, H2, O2 and C were also evaluated. MEchanical properties measured were smooth and notched tensile strength up to 650C 1200F, room temperature notched stress rupture, and creep- rupture over the range 593C 1100F to 982C 1800F. Test results indicate that useful engineering alloys are evolving in both systems, although melting and processing of the gamma phase alloys is not as advanced as that of alpha-two alloys.
APPROVED FOR PUBLIC RELEASE