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One of the most commonly used titanium alloys is an alpha-beta alloy containing 6% Al and 4% V. This alloy, usually referred to as Ti 6Al-4V, exhibits an excellent combination of corrosion resistance, strength and toughness. Typical uses include medical devices or implants, aerospace applications and pressure vessels. In the case of medical applications, stringent user specifications require controlled microstructures and freedom from melt imperfections. The interstitial elements of iron and oxygen are carefully controlled to improve ductility and fracture toughness. Controlled interstitial element levels are designated ELI (extra low interstitials). Hence the designation Ti 6Al-4V ELI.
| Weight % | Al | C | H | Fe | N | O | Ti | V | Other (each) | Other (total) |
|---|---|---|---|---|---|---|---|---|---|---|
| minimum | 5.50 | — | — | — | — | — | Bal. | 3.50 | — | — |
| maximum | 6.75 | 0.08 | 0.0125 | 0.25 | 0.03 | 0.13 | 4.50 | 0.05 | 0.30 |
| Characteristics | English | Metric | |
|---|---|---|---|
| Nominal density | 25°C / 78°F | 0.160 lbs/in3 | 4.43 g/cm3 |
| Melting range | 2919-3020 °F | 1604-1660 °C | |
| Specific heat | 25°C / 78°F | 0.1258 BTU/lb- °F | 526 J/Kg- °K |
| Coefficient of thermal
expansion From 20°C to temperature |
100°C / 212°F | 4.78 µin/in- °F | 8.60 µm/m- °K |
| 315°C / 599°F | 5.11 µin/in- °F | 9.20 µm/m- °K | |
| 650°C /1200°F | 5.39 µin/in- °F | 9.70 µm/m- °K | |
| Thermal conductivity | 100-300°C
(212-572°F) |
3.87 BTU/ft- hr – °F | 6.70 W/m – °K |
| Electrical resistivity | 25°C / 78°F | 1780 nΩ · m | |
| Form | Tensile | |||||||
|---|---|---|---|---|---|---|---|---|
| Ultimate | Yield | Elongation | Reduction of area | |||||
| KSI | MPa | KSI | MPa | % | % | |||
| Typical Room-temperature | 120 | 827 | 110 | 758 | 13 | 22 | ||
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