Titanium Alloy Ti-6Al-4V-ELI

General Characteristics
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.
Typical Chemical Composition

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

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

Mechanical Properties

Form Tensile

Ultimate Yield Elongation Reduction of area

KSI MPa KSI MPa % %

Typical Room-temperature 120 827 110 758 13 22
Specifications
- AMS – 4907
- ASTM – F135(Surgical instruments)
- Military standards – Mil-T-9046
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