Ti-6Al-4V

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Ti-6Al-4V (often Ti64 ) is a high-strength titanium alloy and consists of titanium , 6 percent by mass aluminum and 4% vanadium . The alloy is by far the most frequently used titanium alloy and is characterized by high strength and good resistance to corrosion .

use

The alloy is used in many industries because of its specific properties. Thus, compressor blades , housing and bolts for engines made of her. In the automotive industry , the alloy finds its place in the manufacture of valves or connecting rods . In medical technology, containers or implants made of this alloy are mainly used because of their very good biocompatibility .

Chemical composition

Figures in percent of the total mass
proportion of Ti Al V Fe O C. N H
Min. Main ingredient 5.5 3.5 - - - - -
Max. Main ingredient 6.75 4.5 0.4 0.2 0.08 0.05 0.015

For many areas of application there are more stringent specifications that are defined in the relevant standards. However, the materials are always within the above proportions of the Ti64 material group.

Mechanical properties

Mechanical properties for Ti-6Al-4V.

Surname Hardness [ HV ] Modulus of elasticity [GPa] Tensile strength [MPa] Elongation at break [%]
Ti-6Al-4V 300-400 110-140 900-1200 13-16

structure

Micrograph of a structure (globular) magnified 1000 times. The alpha phase is light, the beta phase is dark

The alloy has a two-phase structure (α + β). Aluminum stabilizes the hexagonally arranged α-phase and vanadium the body-centered cubic β-phase. By simply cooling down, a lamellar (layered) structure is formed, which can be transformed into a globular (granular) structure through a recrystallization process. The structure can have over 90% of the α-phase, which appears light in the cut . The different structures have a major influence on the mechanical properties of the material.

Standards used

The following standards apply to the material Ti-6Al-4V in the aerospace industry:

  • DIN EN 3310: Forging stock for annealed forgings
  • DIN EN 3311: Bars for machining
  • DIN EN 3312: Annealed forgings
  • DIN EN 3354: Sheets for superplastic forming
  • DIN EN 3456: Hot-rolled sheets and strips
  • DIN EN 3464: Annealed panels between 6 mm and 100 mm thick
  • DIN EN 3813: Connecting elements made of bars and wires for hot head forging

Individual evidence

  1. ↑ a b c d e titanium and titanium alloys . September 27, 2002, doi : 10.1002 / 9783527611089 ( wiley.com [accessed June 16, 2018]).
  2. ↑ Material data sheet. HSM, accessed on June 16, 2018 (German).
  3. ↑ Titanium and titanium alloys . September 27, 2002, p. 20 , doi : 10.1002 / 9783527611089 ( wiley.com [accessed June 16, 2018]).
  4. ↑ Robert Pederson: Microstructure and phase transformation of Ti-6Al-4V. Retrieved June 26, 2018 .
  5. ↑ Perinorm specialist database. Accessed June 21, 2018 (German, English).