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Titanium Alloys - Ti8Al1Mo1V

Sep 12 2002

Chemical Formula

Ti8Al1Mo1V

Background

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.

Applications

As mentioned previously, this alloy is used in aeroengines for components such as fan or compressor blades due to its creep resistant properties.

Source: Titanium Information Group.

For more information on this source please visit Titanium Information Group.

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