This near-alpha alloy was designed primarily for creep resistance up to 430°C (805°F). As such it has been used in aeroengine applications such as forged fan or compressor blades. The Ti-8-1-1 alloy has the highest tensile modulus and lowest density of any commercial titanium alloy.
Composition

Table 1. The composition of Ti8Al1Mo1V.




Content

C


<0.08%

Fe


<0.3%

N2


<0.05%

O2


<0.12%

Al


7.35-8.35%

Mo


0.75-1.25%

V


0.75-1.75%

H2 (bar)


<0.0125

H2 (forging)


<0.015%

Ti


Balance
Designations

Other designations for Ti5Al2.5Sn include:

· AMS 4915

· AMS 4916

· AMS 4972

· AMS 4973

· MIL –T-9046

· MIL –T-9047

· UNS R54810
Key Properties
Physical Properties

Table 2. Typical physical properties for T Ti8Al1Mo1V.

Property


Typical Value

Density g/cm3 (lb/ cu in)


4.37 (0.157)

Melting Range °C±15°C (°F)


1538 (2800)

Volume Electrical Resistivity ohm.cm (ohm.in)


198 (78)

Thermal Conductivity W/m.K (BTU/ft.h.°F)


6.5 (45)

Mean Co-Efficient of Thermal Expansion 0-100°C /°C (0-212°F /°F)


8.5x10-6 (4.7)

Mean Co-Efficient of Thermal Expansion 0-300°C /°C (0-572°F /°F)


9.0x10-6 (5.3)

Mean Co-Efficient of Thermal Expansion 0-550°C /°C (0-1022°F /°F)


10.1x10-6 (5.6)

Beta Transus °C±15°C (°F)


1038 (1900)
Mechanical Properties

Table 3. Typical mechanical properties for T Ti8Al1Mo1V.

Property


Minimum


Typical Value

Tensile Strength MPa (ksi)


897 (130)


1021 (148)

0.2% Proof Stress MPa (ksi)


828 (120)


924 (134)

Elongation Over 2 Inches %


10


19

Reduction in Area %


20




Elastic Modulus GPa (Msi)





117 (17)

Hardness Rockwell C





36

Specified Bend Radius <0.070 in x Thickness





4.5

Welded Bend Radius x Thickness


6




Charpy, V-Notch Impact J (ft.lbf)


27 (20)



Fabrication

· Weldability – Fair

· Forging – Rough 1010-1038°C (1850-1900°F), finish 1010°C (1850°F)

· Annealing – Single 788°C (1450°F), 8hr, FC, Duplex – single and 788°C (1450°F), 1hr, AC

· Stress Relief Annealing – Bar and forgings – 900 or 1010°C (1650-1850°F), 1hr, WQ or AC and 593°C (1110°F), 8hr, AC, 593-649°C (1100-1200°F), 1hr, AC.