Grade 5 Titanium

Properties of Titanium Ti-6Al-4V (Grade 5):

 

Grade 5 Titanium is one of the most popular alloys in the titanium industry and makes up almost half of the titanium used in the world.  Commonly referred to as Ti-6AL-4V (or Ti 6-4), this designation refers to its chemical composition of almost 90% titanium, 6% aluminum, 4% vanadium, 0.25% (max) iron  and 0.2% (max) oxygen.  It has excellent strength, low modulus of elasticity, high corrosion resistance, good weldability and it is heat treatable.  The addition of aluminum and vanadium increases the hardness of the material in the alloy matrix, improving its physical and mechanical properties.

  • High tensile strength—Ti 6Al-4V’s strength nears
    that of stainless steel, requiring high cutting
    forces.
  • Low thermal conductivity—Heat does not readily
    transfer into the chip but rather flows into the
    cutting tool, which makes the cutting edge very
    hot during the machining process.
  • High modulus of elasticity—Titanium is very
    “springy.” For a given force, it will deflect more
    than steel, which results in a higher likelihood of
    vibration, chatter, and poor chip formation.
  • Shear mechanism—Titanium requires a sharp
    cutting edge to cut the material and avoid tearing
    and smearing, which will quickly lead to tool
    failure
Mechanical Properties Metric English
Hardness, Brinell 379 379
Hardness, Knoop 414 414
Hardness, Rockwell C 41 41
Hardness, Vickers 396 396
Tensile Strength, Ultimate 1170 MPa 170000 psi
Tensile Strength, Yield 1100 MPa 160000 psi
Elongation at Break 10 % 10 %
Modulus of Elasticity 114 GPa 16500 ksi
Compressive Yield Strength 1070 MPa 155000 psi
Notched Tensile Strength 1550 MPa 225000 psi
Ultimate Bearing Strength 2140 MPa 310000 psi
Bearing Yield Strength 1790 MPa 260000 psi
Poisson’s Ratio 0.33 0.33
Charpy Impact 23 J 17 ft-lb
Fatigue Strength 160 MPa 23200 psi
Fatigue Strength 700 MPa 102000 psi
Fracture Toughness 43 MPa-m½ 39.1 ksi-in½
Shear Modulus 44 GPa 6380 ksi
Shear Strength 760 MPa 110000 psi

 

 

Electrical Properties Metric English
Electrical Resistivity 0.000178 ohm-cm 0.000178 ohm-cm
Magnetic Permeability 1.00005 1.00005
Magnetic Susceptibility 3.3e-006 3.3e-006
Thermal Properties Metric English
CTE, linear 20°C 8.6 µm/m-°C 4.78 µin/in-°F
CTE, linear 250°C 9.2 µm/m-°C 5.11 µin/in-°F
CTE, linear 500°C 9.7 µm/m-°C 5.39 µin/in-°F
Specific Heat Capacity 0.5263 J/g-°C 0.126 BTU/lb-°F
Thermal Conductivity 6.7 W/m-K 46.5 BTU-in/hr-ft²-°F
Melting Point 1604 – 1660 °C 2920 – 3020 °F
Solidus 1604 °C 2920 °F
Liquidus 1660 °C 3020 °F
Beta Transus 980 °C 1800 °F

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