Method for developing enhanced texture in titanium alloys,...

C - Chemistry – Metallurgy – 22 – F

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148/35.7

C22F 1/18 (2006.01) C22C 14/00 (2006.01)

Patent

CA 2019529

13DV10049 METHOD FOR DEVELOPING ENHANCED TEXTURE IN TITANIUM ALLOYS, and ARTICLES MADE THEREBY ABSTRACT OF THE DISCLOSURE Enhanced crystallographic texture is developed in an alpha or alpha-beta titanium alloy having a dispersion of particles therein, by heating the alloy to essentially the all beta phase range and mechanically hot working the alloy in this range. The mechanical working is preferably accomplished by extrusion, rolling, or forging. The particles are stable during working, and prevent the formation of random texture in recrystallized beta phase grains at the working temperature. The particles are preferably oxides formed from rare earth elements such as erbium or yttrium, that are introduced into the alloy during manufacture. The alloys processed according to the invention are preferably prepared by powder metallurgy to achieve a uniform microstructure prior to working. A particularly suitable alpha-beta (but near alpha) titanium alloy contains aluminum, zirconium, hafnium, tin, columbium, molybdenum, tungsten, ruthenium, germanium, silicon, and erbium.

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