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Titanium Alloys - Ti5Al2.5Sn Grade 6

Chemical Formula

Ti5Al2.5Sn

Background

This alloy is most commonly used for airframe and jet engine applications requiring good weldability, stability and strength at elevated temperatures.

Ti5Al2.5Sn ELI

Ti5Al2.5Sn ELI has had extended use for liquid gas and propellant containment for rockets and space vehicles.

Composition

Table 1. The composition of Ti5Al2.5Sn Grade 6.

Content

C

<0.08%

Fe

<0.5%

N2

<0.05%

O2

<0.2%

Al

4.0-6.0%

Sn

2.0-3.0%

H2

<0.02%

Ti

Balance

Designations

Other designations for Ti5Al2.5Sn include:

        AMS 4910

        AMS 4926

        AMS 4966

        ASTM B265 Gr6

        ASTM B348 Gr6

        ASTM B381 Gr6

        MIL –T-9046 2A or ELI 2B

        MIL –T-9047 2A or ELI 2B

Key Properties

Physical Properties

Table 2. Typical physical properties for Ti5Al2.5Sn Grade 6.

Property

Typical Value

Density g/cm3 (lb/ cu in)

4.48 (0.161)

Melting Range °C±15°C (°F)

1571 (3860)

Specific Heat J/kg.°C (BTU/lb/°F)

540 (0.129)

Volume Electrical Resistivity ohm.cm (ohm.in)

157 (62)

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

7.7 (53)

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

9.5x10-6 (5.3)

Beta Transus °C±15°C (°F)

1038 (1900)

Mechanical Properties

Table 3. Typical mechanical properties for Ti5Al2.5Sn Grade 6.

Property

Minimum

Typical Value

Tensile Strength MPa (ksi)

828 (120)

972 (141)

0.2% Proof Stress MPa (ksi)

779 (113)

897 (130)

Elongation Over 2 Inches %

10

16

Reduction in Area %

25

Elastic Modulus GPa (Msi)

110 (16)

Hardness Rockwell C

36

Specified Bend Radius <0.070 in x Thickness

4.0

Specified Bend Radius >0.070 in x Thickness

4.5

Post-weld stress relieved
Welded Bend Radius x Thickness

5.0

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

26 (19)

Fabrication

        Weldability – Excellent

        Forging – Rough 1010-1030°C (1850-1900°F), finish 954-1010°C (1750-1850°F)

        Annealing – 718-843°C (1325-1550°F), 10 min-4hr, AC

        Stress Relief Annealing – 538-650°C (1000-1200°F), 15-60 mins, A.C.

Applications

As mentioned previously, this alloy is most commonly used for airframes and jet engines applications requiring good weldability, stability and strength at elevated temperatures.

The ELI grade has been used for liquid gas and propellant containment for rockets and space vehicles.

Source: Titanium Information Group.

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

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