Titanium 6Al-2Sn-4Zr-6Mo (Ti-6-2-4-6) is a high-strength alpha-beta titanium alloy developed for heavily loaded aerospace structural components. It offers very high strength, deep hardenability, and excellent fracture toughness, positioning it between Ti-6Al-4V and near-beta titanium alloys.
Material Classification
| UNS | R56260 |
|---|---|
| Alloy Type | Alpha-Beta Titanium Alloy |
| Key Position | High-strength aerospace structural alloy |
| Heat Treatable | Yes (Solution Treated & Aged) |
Mechanical Properties (Typical)
| Property | Value |
|---|---|
| Tensile Strength | 1100 – 1250 MPa |
| Yield Strength | 1000 – 1150 MPa |
| Elongation | 8 – 12% |
| Density | ~4.54 g/cm³ |
High-Temperature & Fatigue Performance
Ti-6-2-4-6 retains strength up to approximately 400 °C and offers better creep resistance than Ti-6Al-4V. It exhibits excellent low-cycle and high-cycle fatigue resistance and high resistance to stress-corrosion cracking.
Fabrication & Processing
✔ Fully heat treatable with tailored strength and toughness
✔ Good forgeability for large and thick aerospace forgings
✔ Machining is more difficult than Ti-6Al-4V due to higher strength
✔ Weldable with proper procedures; post-weld heat treatment recommended
Corrosion Resistance
Titanium 6-2-4-6 offers excellent resistance to marine environments, aircraft fuels, hydraulic fluids, and atmospheric corrosion, supported by a stable titanium oxide passive film.
Applications
Aerospace: Landing gear components, wing carry-through structures, fuselage frames, engine mounts
Defense & Space: Missile airframes, load-bearing space vehicle components, high-strength fasteners
High-Performance Engineering: Motorsport structural components, high-load mechanical systems
Advantages
✔ Very high structural strength
✔ Deep hardenability for thick sections
✔ Excellent fracture toughness
✔ Superior fatigue resistance
✔ Significant weight savings versus steel
Ti-6-2-4-6 vs Ti-6Al-4V
| Feature | Ti-6-2-4-6 | Ti-6Al-4V |
|---|---|---|
| Strength | Much higher | Lower |
| Hardenability | Deep | Limited |
| Toughness | Excellent | Very good |
| Cost | Higher | Lower |
| Typical Use | Heavy structural | General aerospace |
Summary:
Titanium 6Al-2Sn-4Zr-6Mo (Ti-6-2-4-6) is a premium aerospace-grade alpha-beta
titanium alloy optimized for thick, highly loaded structures. It delivers
exceptional strength, toughness, fatigue resistance, and deep hardenability,
making it the preferred choice when Ti-6Al-4V is not strong enough.