Ti6Al4V

Ti-6Al-4V, commonly called Ti-6Al-4V or Ti-6-4, is a widely used titanium alloy consisting of about 6% aluminum and 4% vanadium by weight, with the remainder titanium. It is an α+β alloy, forming a two-phase microstructure that provides a favorable balance of strength, toughness, and corrosion resistance for a light-weight material.

The alloy offers high specific strength and good fatigue resistance, along with excellent corrosion resistance in many environments and good fracture toughness for a titanium alloy. It has relatively high stiffness among structural metals and maintains performance at elevated temperatures within its range. It can be welded and formed with appropriate procedures; machining and finishing are common steps in production.

Processing typically involves solution treatment and aging to tailor strength, with the option of annealing to improve ductility. The Extra-Low-Interstitial (ELI) variant reduces interstitial elements and is widely used for biomedical implants due to enhanced fracture toughness and long-term performance.

Applications include aerospace components such as airframes and engine parts, as well as medical implants (orthopaedic and dental), dental implants, and surgical instruments. Variants include Grade 5, the standard alloy in many structural applications, and Grade 23, the ELI variant used for implants.