Method for fabricating a beryllium fiber reinforced composite having a titanium matrix

Abstract

Abstract A process for forming fibrous beryllium/titanium composites from separate beryllium and titanium materials wherein the resultant composite consists of continuous Be fibers of selective size, array, placement, and geometry in a matrix of continuous Ti or Ti alloy phase. The process is characterized by surrounding discrete preformed Be shapes or fiber precursor bodies with either powdered or preformed Ti material and extruding a cannister containing this assembled body at a temperature of from 1,350* to 1,525*F. to a reduction ratio of from 6/1 to 100/1 or greater to form a consolidated Be/Ti composite having a very limited but discernible intermetallic reaction zone of titanium beryllide formed in situ. After extrusion and cooling, the yield strength of the composite can, if desired, be substantially improved by cold working at 70% to 80% of the ultimate tensile strength. Composite beryllium titanium bodies so fabricated have tensile properties superior to those of Be/Ti composites fabricated up to 1,300*F. and superior ductility, toughness and strength to those of Be/Ti composites made from blended Be and Ti powders hot extruded at 1,350*F. to 1,525*F. Furthermore, because of the capability of controlling the geometry of the array of fibers in composite sections, it is possible to ''''design'''' properties to specific applications. These materials may be fabricated by known techniques into aircraft engine parts, e.g., gas turbine compressor blades, vanes and shafts. They would also be useful in other shaft applications requiring high modulus and low weight such as high speed machinery.

Inventors

• 👤 V Goodwin

Bibliographic Details