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

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 0.25 
OMax 0.2 

Material Notes:
Information provided by Allvac and the references. Solution Treated 900-955C, Aged 540C. Alpha-Beta Alloy.

Applications: Blades, discs, rings, airframe, fasteners, components. Vessels, cases, hubs, forgings.. 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, Brinell379379 Estimated from Rockwell C.
Hardness, Knoop414414 Estimated from Rockwell C.
Hardness, Rockwell C4141 
Hardness, Vickers396396 Estimated from Rockwell C.
Tensile Strength, Ultimate1170 MPa170000 psi 
Tensile Strength, Yield1100 MPa160000 psi 
Elongation at Break10 %10 % 
Modulus of Elasticity114 GPa16500 ksi Average of tension and compression
Compressive Yield Strength1070 MPa155000 psi 
Notched Tensile Strength1550 MPa225000 psi Kt (stress concentration factor) = 6.7
Ultimate Bearing Strength2140 MPa310000 psi e/D = 2
Bearing Yield Strength1790 MPa260000 psi e/D = 2
Poisson's Ratio0.330.33 
Charpy Impact23 J17 ft-lb V-notch
Fatigue Strength160 MPa23200 psi at 1E+7 cycles. Kt (stress concentration factor) = 3.3
Fatigue Strength700 MPa102000 psi Unnotched 10,000,000 Cycles
Fracture Toughness43 MPa-m39.1 ksi-in 
Shear Modulus44 GPa6380 ksi 
Shear Strength760 MPa110000 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 
Beta Transus980 C1800 F 

References for this datasheet.

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