Ti-6Al-4V, UNS R56400, is the nominal composition of titanium alloy Grade 5 which is the most widely used titanium alloy grade. Many other titanium alloys are improved version of this grade. Ti-6Al-4V, is a typical alpha+beta alloy which is primarily furnished in annealed condition. It has useful creep resistance up to 300°C (570°F) and excellent fatigue strength. It can also be used for cryogenic applications at extremely low temperatures.
ASTM B348 Ti-6Al-4V Dia. 300mm*115mm – Sep. 7, 2022
Ti-6Al-4V alloys can be used for a variety of applications such as aircraft gas turbine disks and blades, airframe structural components, oil and gas offshore platforms, bolts & nuts, and surgical implants, etc. They are available in product forms of strip, sheet, plate, bar, rod, tube, fitting and forging.
Ti-6Al-4V has good corrosion resistance to atmosphere, oxygen, seawater, as well as pure hydrocarbons. It can be produced by metal or remelting process such as vacuum arc remelting(VAR), electron beam(EB), and plasma arc hearth melting(PAM), etc.
Chemical Composition of Ti-6Al-4V
| C | O | N | H | Fe | Al | V | *Other1 | *Other2 |
|---|---|---|---|---|---|---|---|---|
| ≤0.08 | ≤0.20 | ≤0.05 | ≤0.015 | ≤0.40 | 5.5~6.75 | 3.5~4.5 | ≤0.1 | ≤0.4 |
Typecial Mechanical Properties
| Tensile Strength, min. | Yield Strength, min. | Elongation in 4D | Reduction of Area | ||
|---|---|---|---|---|---|
| ksi | MPa | ksi | MPa | min. % | min. % |
| 130 | 895 | 120 | 828 | 10 | 25 |
*Mechanical properties may vary in different product forms, sizes and heat treatment conditions.
Microstructure
Ti-6Al-4V is a typical α+β alloy. Aluminum is the primarily alpha stabilizer in this titanium alloy. It increases tensile strength, creep strength, and the elastic modulus. Vanadium is a beta stabilizer which is completely miscible in the beta phase.
Microstructure of Ti-6Al-4V
The physical properties
- Density: 4.5 g/cm3
- Melting range: 1536°C~1650°C
- Beta transus temperature: 1800°F~1850°F
- Electrical resistivity at room temperature(73.4°F): 1053 ohm-cir-mil/ft;
- Modulus of elasticity: 110 GPa