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Titanium Ti 6AL 4V - AMS 4911

Titanium Ti 6AL 4V AMS 4911 BilletTi6Al4V, also known as grade 5, Ti-6Al-4V or Ti 6-4, is the most commonly used titanium alloy. It has a chemical composition of 6% aluminum, 4% vanadium, 0.25% (maximum) iron, 0.2% (maximum) oxygen, and the remainder titanium. It is significantly stronger than commercially pure titanium while having the same stiffness and thermal properties (excluding thermal conductivity, which is about 60% lower in Grade 5 Ti than in CP Ti). Among its many advantages, it is heat treatable. This grade is an excellent combination of strength, corrosion resistance, weld and fabric ability. This alpha-beta alloy is the workhorse alloy of the titanium industry. The alloy is fully heat treatable in section sizes up to 15mm and is used up to approximately 400°C (750°F). Over 70% of all alloy grades melted are a sub-grade of Ti6Al4V, its uses vary in many aerospace airframe and engine component uses and also major non-aerospace applications in the marine, offshore and power generation industries in particular.

Generally, Ti-6Al-4V is used in applications up to 400 degrees Celsius. It has a density of roughly 4420 kg/m3, Young's modulus of 110 GPa, and tensile strength of 1000 Mpa. By comparison, annealed type 316 stainless steel has a density of 8000 kg/m3, modulus of 193 GPa, and tensile strength of only 570 Mpa. While tempered 6061 aluminum alloy has 2700 kg/m3, 69 GPa, and 310 MPa, respectively. 

Titanium AMS 4911 BarsMill anneal 1300-1450°F 2 hours, air cool. Re-crystallization anneal bar for better ductility and fatigue strength, 1750°F 2 hours, furnace cool. For maximum fracture toughness and stress corrosion cracking resistance (SCC), Beta anneal 1950°F 1-2 hours, water quench. Then age 1150-1300°F 2 to 4 hours, air cool. For maximum strength, solution-treated and aged (STA) condition is: For sheet, 1675-1725°F 5 to 25 minutes, water quench. Age 975°F 4 to 6 hours, air cool. For bars and forgings, 1675-1725°F 1 hour, water quench. Age 975-1025°F 3 hours, air cool. For increased fracture toughness, but lower tensile strength, precipitation treat (overage) 1150-1250°F 4 hours, air cool. Stress relief annealing is commonly 1000-1200°F 1 to 4 hours, air cool.

Ti 6Al-4V is susceptible to chloride (SCC), although being among the better of the titanium alloys in this regard. For marine environments silver plated bolts are not used, as silver bonds easily with chlorine in this environment. Ti 6Al-4V is also susceptible to SCC in environments such as methyl alcohol, red fuming HNO3, and N2O4. In the case of red fuming nitric acid, the problem is limited to environments containing less than 1.5% water, or more than 6% NO2. Failure in N2O4 has occurred when oxygen and chlorides were present as impurities.

Ti-6Al-4V is the alloy most commonly used in wrought and cast forms. Palladium or ruthenium can be added for increased corrosion resistance. Most properties are affected by the microstructure, which is determined by the thermo-mechanical history. It is highly resistant to general corrosion in sea water. This alloy is available in most common product forms including billet, bar, wire, plate, and sheet. 

Ti-6Al-4V has Excellent biocompatibility, 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.

Chemistry Components

 

Al

V

C

N

O

H

Fe

Y

Others

Each

Ti

MIN

5.5

3.5

_

_

_

_

_

_

_

_

MAX

6.75

4.5

0.08

0.5

0.2

0.0125

0.3

0.005

0.1

Balance

 Applications

  Blades, Rings, and Discs
  Sporting Equipment
  Aircraft Structural Components
  Hand Tools
  Airframes
  Fasteners, Components
  Vessels, Cases, Hubs, Forgings
  Biomedical Implants

Inventory

  Forged Billet
  Sheet
  Plate
  Rectangular Bar
  Bar

Specifications

 

AMS 4911, AMS 4920, AMS 4928, AMS 4934, AMS 4935, AMS 4965, AMS 4967, AMS 6930, AMS 6931, AMS T-9046, AMS T-9047
ASME SB 348, ASME SB 861, ASME SB-265 Grade 5
ASTM B 265, ASTM B 348, ASTM B 381, ASTM B 861, ASTM F 1472
EN 3.7164, EN 3.7165
MIL-T-9046, MIL-T-9047
UNS R56400
Werkstoff 3.7164, Werkstoff 3.7165

   
PHYSICAL PROPERTIES

METRIC

ENGLISH

COMMENTS

 

Density

4.43 g/cc

0.16 lb/in³

 


Mechanical Properties

Hardness, Brinell

334

334

 Estimated from Rockwell C.

Hardness, Knoop

363

363

 Estimated from Rockwell C.

Hardness, Rockwell C

36

36

 

Hardness, Vickers

349

349

 Estimated from Rockwell C.

Tensile Strength, Ultimate

950 MPa

138000 psi

 

Tensile Strength, Yield

880 MPa

128000 psi

 

Elongation at Break

14 %

14 %

 

Reduction of Area

36 %

36 %

 

Modulus of Elasticity

113.8 GPa

16500 ksi

 

Compressive Yield Strength

970 MPa

141000 psi

 

Notched Tensile Strength

1450 MPa

210000 psi

 Kt (stress concentration factor) = 6.7

Ultimate Bearing Strength

1860 MPa

270000 psi

 e/D = 2

Bearing Yield Strength

1480 MPa

215000 psi

 e/D = 2

Poisson's Ratio

0.342

0.342

 

Charpy Impact

17 J

12.5 ft-lb

 V-notch

Fatigue Strength

240 MPa

34800 psi

 at 1E+7 cycles. Kt (stress concentration factor) = 3.3

Fatigue Strength

510 MPa

74000 psi

 Unnotched 10,000,000 Cycles

Fracture Toughness

75 MPa-m½

68.3 ksi-in½

 

Shear Modulus

44 GPa

6380 ksi

 

Shear Strength

550 MPa

79800 psi

 Ultimate shear strength


Electrical Properties

Electrical Resistivity

0.000178 ohm-cm

0.000178 ohm-cm

 

Magnetic Permeability

1.00005

1.00005

 at 1.6kA/m

Magnetic Susceptibility

3.3e-006

3.3e-006

 cgs/g


Thermal Properties

CTE, linear 20°C

8.6 µm/m-°C

4.78 µin/in-°F

 20-100ºC

CTE, linear 250°C

9.2 µm/m-°C

5.11 µin/in-°F

 Average over the range 20-315ºC

CTE, linear 500°C

9.7 µm/m-°C

5.39 µin/in-°F

 Average over the range 20-650ºC

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

 

 


 

ASM Aerospace Specification Metals, Inc.
2501 N.W. 34th Place #B28
Pompano Beach, Florida 33069
www.aerospacemetals.com
Local: 954 977-0666
Toll Free: 800 398-4345


 

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