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Titanium Alloys - Ti5Al2Sn4Mo2Zr4Cr Properties and Applications

Chemical Formula

Ti5Al2Sn4Mo2Zr4Cr

Background

This near-beta, high strength, deep hardenable forging alloy was developed primarily for gas turbine applications such as discs for fan and compressor stages. In addition to offering superior strength properties over Ti6Al4V, the alloy also provides higher creep resistance in the intermediate temperature ranges.

Composition

Table 1. The composition of Ti5Al2Sn4Mo2Zr4Cr.

Content

Al

4.5-5.5%

Sn

1.6-2.4%

Mo

3.5-4.5%

Zr

1.6-2.4%

Cr

3.5-4.5%

O2

0.08-0.13%

Fe

<0.25%

H2

<0.0125%

C

<0.05%

N2

<0.05%

Ti

Balance

Designations

Other designations for Ti5Al2Sn4Mo2Zr4Cr include:

        C50TF44

        C50TF57

        C50TF62

        UNS R58650

Key Properties

Physical Properties

Table 2. Typical physical properties for Ti5Al2Sn4Mo2Zr4Cr.

Property

Typical Value

Density g/cm3 (lb/ cu in)

4.65 (0.167)

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

9.0x10-6 (5.0)

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

9.4x10-6 (5.2)

Mean Thermal Expansion Co-eff 0-500°C /°C (0-932°F /°F)

9.7x10-6 (5.4)

Beta Transus °C±15°C (°F)

891 (1636)

Mechanical Properties

Table 3. Typical mechanical properties for T Ti5Al2Sn4Mo2Zr4Cr.

Property

Minimum

Typical

Tensile Strength MPa (ksi) sheet

1124 (163)

1172 (170)

0.2% Proof Stress MPa (ksi)

1055 (153)

1104 (160)

Reduction in Area %

35

Elastic Modulus GPa (Msi)

110 (16)

Fabrication

        Solution Treating - 802°C (1475°F), 4hr, WQ

        Ageing – 593-672°C (1100-1250°F), 8 hr AC

        Stress Relief Annealing - 549°C (1020°F), 4hr AC

Applications

As mentioned above, Ti5Al2Sn4Mo2Zr4Cr is suited to gas turbine applications such as discs for fan and compressor stages.

Source: The Titanium Information Group

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

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