Titanium Ti-6Al-4V (Grade 5), ELI, Annealed

Subcategory: Alpha/Beta Titanium Alloy; Metal; Nonferrous Metal; Titanium Alloy

Close Analogs: 4 other heat treatments of this alloy are listed in MatWeb.

Key Words: Ti-6-4; UNS R56400; ASTM Grade 5 titanium; UNS R56401 (ELI); Ti6Al4V, biomaterials, biomedical implants, biocompatibility

Component   Wt. %
FeMax 0.14 
OMax 0.13 

Material Notes:
Information provided by Allvac and the references. Annealing Temperature 700-785C. ELI (Extra Low Interstitial) grade has lower impurity limits, especially oxygen and iron. Alpha-Beta Alloy

Applications: Applications requiring excellent fracture toughness and fatigue strength; aircraft, structural components, biomedical.. Biomedical implants.

Biocompatibility: Excellent, especially when direct contact with tissue or bone is required. Ti-6Al-4V's poor shear strength makes it undesirable for bone screws or plates. It also has poor surface wear properties and tends to seize when in sliding contact with itself and other metals. Surface treatments such as nitriding and oxidizing can improve the surface wear properties.

Physical PropertiesMetricEnglishComments
Density4.43 g/cc0.16 lb/in 

Mechanical Properties
Hardness, Brinell326326 Estimated from Rockwell C.
Hardness, Knoop354354 Estimated from Rockwell C.
Hardness, Rockwell C3535 
Hardness, Vickers341341 Estimated from Rockwell C.
Tensile Strength, Ultimate860 MPa125000 psi 
Tensile Strength, Yield790 MPa115000 psi 
Elongation at Break15 %15 % 
Modulus of Elasticity113.8 GPa16500 ksi 
Compressive Yield Strength860 MPa125000 psi 
Notched Tensile Strength1170 MPa170000 psi Kt (stress concentration factor) = 3.5
Ultimate Bearing Strength1740 MPa252000 psi e/D = 2
Bearing Yield Strength1430 MPa207000 psi e/D = 2
Poisson's Ratio0.3420.342 
Charpy Impact24 J17.7 ft-lb V-notch
Fatigue Strength140 MPa20300 psi at 1E+7 cycles. Kt (stress concentration factor) = 3.1
Fatigue Strength300 MPa43500 psi 1E+7 cycles, Unnotched
Fracture Toughness100 MPa-m91 ksi-in KIC
Shear Modulus44 GPa6380 ksi 
Shear Strength550 MPa79800 psi Ultimate shear strength

Electrical Properties
Electrical Resistivity0.000178 ohm-cm0.000178 ohm-cm 
Magnetic Permeability1.000051.00005 at 1.6 kA/m
Magnetic Susceptibility3.3e-0063.3e-006 cgs/g

Thermal Properties
CTE, linear 20C8.6 m/m-C4.78 in/in-F 20-100C
CTE, linear 250C9.2 m/m-C5.11 in/in-F Average over the range 20-315C
CTE, linear 500C9.7 m/m-C5.39 in/in-F Average over the range 20-650C
Specific Heat Capacity0.5263 J/g-C0.126 BTU/lb-F 
Thermal Conductivity6.7 W/m-K46.5 BTU-in/hr-ft-F 
Melting Point1604 - 1660 C2920 - 3020 F 
Solidus1604 C2920 F 
Liquidus1660 C3020 F 

References for this datasheet.

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