Titanium Alloys - Ti4Al4Mo4Sn0.5Si0.1C Physical and Mechanical Properties and Fabrication

Chemical Formula

Ti4Al4Mo4Sn0.5Si0.1C

Background

Ti4Al4Mo4Sn0.5Si0.1C, also known as Timetal 551 is one of the strongest of the commercially available titanium alloys and is creep resistant up to 400°C (750°F). It has a similar composition to Timetal 550, apart from an increase in tin and carbon content, which gives increased strength at room and elevated temperatures.

Composition

Table 1. The composition of Ti4Al4Mo4Sn0.5Si0.1C.

Content

Al

3-5%

Mo

3-5%

Sn

3-5%

Si

0.3-0.7%

C

<0.02%

O2

<0.25%

H2

<0.05%

N2

<0.0125%

Fe

<0.4%

Others

<0.4%

Ti

Balance

Designations

Other designations for Ti4Al4Mo4Sn0.5Si0.1C include:

        TA 38-42

Key Properties

Physical Properties

Table 2. Typical physical properties for Ti4Al4Mo4Sn0.5Si0.1C.

Property

Typical Value

Density g/cm3 (lb/ cu in)

4.62 (0.166)

Mean Co-Eff of Thermal Expansion 20-100°C/°C 68-212°F/°F

8.4x10-6 (4.7)

Mean Co-Eff of Thermal Expansion 20-200°C/°C 68-392°F/°F

9.0x10-6 (5.0)

Mean Co-Eff of Thermal Expansion 20-300°C/°C 68-572°F/°F

9.3x10-6 (5.2)

Mean Co-Eff of Thermal Expansion 20-400°C/°C 68-750°F/°F

9.5x10-6 (5.3)

Mean Co-Eff of Thermal Expansion 20-500°C/°C 68-932°F/°F

9.6x10-6 (5.3)

Mean Co-Eff of Thermal Expansion 20-600°C/°C 68-1112°F/°F

9.7x10-6 (5.4)

Beta Transus °C±15°C (°F)

1050 (1922)

Mechanical Properties

Table 3. Typical mechanical properties for Ti4Al4Mo4Sn0.5Si0.1C.

Property

Typical

0.2% Proof Stress MPa (ksi)

1095 (159)

Tensile Strength MPa (ksi) sheet

1250 (181)

Elongation on 1 inch %

8.0

Reduction in Area %

20

Elastic Modulus GPa (Msi)

115 (17)

Fabrication

Annealing - 900°C (1650°F) 1hr per 25mm section, AC

Solution Treating - 900°C (1650°F) 1hr per 25mm section, AC

Ageing - 500°C (930°F) 24hr, AC

Stress Relief Annealing - 650°C (1200°F) 2hr, AC

Source: The Titanium Information Group

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

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