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DISPERSION STRENGTHENED ALPHA TITANIUM ALLOYS.
Annual rept. 1 Mar 65-28 Feb 66,
GENERAL ELECTRIC CO CINCINNATI OH MATERIALS DEVELOPMENT LAB OPERATION
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The high-temperature strength and stability characteristics of complex alpha titanium Ti-6Al-3Sn-3Zr alloys which contain dispersions of silicide, carbide, and boride particles were investigated. Boride dispersions were coarse and generally ineffective with respect to strength. Carbide dispersions increased high-temperature strength but simultaneously reduced low-temperature toughness and ductility to dangerously low levels after creep exposure. Carbon was found to be an exceptionally potent strengthener at temperatures as high as 1000 F, the mechanisms apparently involving both solid-solution effects and strain-enhanced precipitation. Silicide dispersions increased the high-temperature tensile strength of the matrix in the alpha-worked condition, but alpha-beta andor beta heat treatments were required to increase high temperature creep strength. Silicide dispersion quality was only fair in alphs processed alloys. However, improved dispersion quality is probable with more sophisticated thermal-mechanical processing techniques.
APPROVED FOR PUBLIC RELEASE