Titanium Alloys – Ti5.5Al3.5Sn3Zr1Nb Physical and Mechanical Properties, Fabrication and Applications

 

Chemical Formula

Ti5.5Al3.5Sn3Zr1Nb

Background

Also known as Timetal 829, this is a weldable, creep resistant alloy developed for gas turbine engine components, offering creep resistance up to 540°C (1000°F) with good oxidation resistance. It is a near alpha alloy but includes additional alpha and beta stabilising alloying elements. Ti5.5Al3.5Sn3Zr1Nb also has good forgeability

Composition

Table 1. The composition of Ti5.5Al3.5Sn3Zr1Nb.

Content

Al

5.2-5.7%

Sn

3.0-4.0%

Zr

2.50-3.50%

Nb

0.70-1.30%

Mo

0.25-0.35%

Si

0.25-0.50%

C

<0.08%

O2

0.09-0.15%

N2

<0.03%

H2

<0.006%

Others

<0.20%

Ti

Balance

Key Properties

Physical Properties

Table 2. Typical physical properties for Ti5.5Al3.5Sn3Zr1Nb.

Property

Typical Value

Density g/cm3 (lb/ cu in)

4.54 (0.163)

Mean Thermal Expansion Co-eff 20-100°C /°C (68-212°F /°F)

9.5x10-6 (5.3)

Mean Thermal Expansion Co-eff 20-400°C /°C (68-752°F /°F)

9.8x10-6 (5.4)

Mean Thermal Expansion Co-eff 20-600°C /°C (68-1112°F /°F)

10x10-6 (5.6)

Beta Transus °C±15°C (°F)

1015 (1859)

Mechanical Properties

Table 3. Typical mechanical properties for Ti5.5Al3.5Sn3Zr1Nb.

Property

Typical

0.2% Proof Stress MPa (ksi)

820 (119)

Tensile Strength MPa (ksi) sheet

930 (135)

Elongation on 5D %

9

Reduction in Area %

15

Elastic Modulus GPa (Msi)

120 (17)

Fabrication

        Weldability – Good

        Forging – Beta 1030 - 1050°C (1886-1922°F), Alpha-beta 980-10o0°C (1796-1830°F)

        Solution Treating - 1050°C (1922°F), 30 min OQ

        Ageing - 625°C (1157°F), 2hr AC

Applications

As mentioned above Ti5.5Al3.5Sn3Zr1Nb was designed for use in gas turbine engines.

Source: The Titanium Information Group

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

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