Titanium 5Al-2.5V ELI

Annealing Procedure

Heat to 718-843 C (1325-1550 F),hold for 4 hours follow by air cooling. For intermediate stress relieving, heat to 538-650 C(1000-1200 F) hold for 1 hour and air cool.

Applications

Primarily employed in aircraft engine and airframe applications.

Cold Workability

The cold work characteristics of this material is similar to that of a moderately tempered austenitic stainless steel. In multiple cold forming operations, intermediate stress relief is recommended to prevent tearing or other material damage. Post-work annealing is required to reattain optimum performance characteristics.

Forgeability

Rough work can be performed at 900 C (1650 F), while finishing operations should be performed at 843 C (1550 F).

Formability

May be hot or cold formed using hydropress, power brake, stretch or drop hammer methods. Similar in characteristics to 300 series stainless steels.

Heat Treatability

This alloy is not hardenable by heat treatment.

Hot Workability

Hot forming will reduce both the springback and required forming forces, and will increase the overall ductility of the material.

Machinability

As a family, titanium and its alloys have developed a mystique as a nightmare to machine. This is simply not the case. Experienced operators have compared its characteristics to those found in 316 stainless steel. Recommended practice includes high coolant flow(to offset the material's low thermal conductivity), slow speeds and relatively high feed rates. Tooling should be tungsten carbide designations C1-C4 or cobalt type high speed tools.

Other Physical Properties

Beta Transus (F +/- 25) 1900

Principle Design Features

This non-heat treatable, alpha alloy combines good weldability with stability and excellent strength from cryogenic through elevated temperatures. It is available at the mill level in sheet, strip, plate, bar, billet, extrusions and wire. Beta Transus (F +/- 25) 1900.

Weldability

Rated as "good" in terms of weldability.