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Titanium Alloys - Ti6Al6V2Sn

Oct 15 2002

Chemical Formula

Ti6Al6V2Sn

Background

Ti6Al6V2Sn is a heat treatable to higher strengths and heavier section sizes than Ti6Al4V. It is used primarily in plate and forging applications for airframes. The alloy is considered to be very difficult to weld.

Composition

Table 1. The composition of Ti6Al6V2Sn.

Content

C

<0.05%

N2

<0.04%

O2

<0.2%

V

5.0-6.0%

Al

5.0-6.0%

Sn

1.5-2.5%

Fe

0.35-1.0%

Cu

0.35-1.0%

H2(bar)

<0.015%

H2(sheet)

<0.015%

H2(plate)

<0.015%

Ti

Balance

Designations

Other designations for Ti6Al6V2Sn include:

•         AMS 4918

•         AMS 4936

•         AMS 4971

•         AMS 4978

•         MIL –T-9046

•         MIL-T-9047

•         UNS R56620

Key Properties

Physical Properties

Table 2. Typical physical properties for Ti6Al6V2Sn.

Property

Typical Value

Density g/cm3 (lb/ cu in)

4.54 (0.163)

Melting Range °C±15°C (°F)

1704 (3099)

Specific Heat J/kg.°C (BTU/lb/°F)

650 (.155)

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

7.2 (50)

Mean Co-Efficient of Thermal Expansion 20-400°C /°C (0-212°F /°F)

9.0x10-6 (5.0)

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

9.4x10-6 (5.2)

Beta Transus °C±15°C (°F)

946 (1735)

Mechanical Properties

Table 3. Typical mechanical properties for Ti6Al2Sn4Zr6Mo (data obtained for bar and plate 1” (25.4mm) thick, annealed.

Property

Minimum

Typical Value

Tensile Strength MPa (ksi)

1035 (150)

1090 (158)

0.2% Proof Stress MPa (ksi)

966 (140)

1021 (148)

Elongation Over 2 Inches %

8

17

Reduction in Area %

15

Hardness Rockwell C

38

Specified Bend Radius <0.070 in x Thickness

4.5

Specified Bend Radius >0.070 in x Thickness

5.0

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

20 (15)

Fabrication

Related Stories

•         Weldability – Limited

•         Forging – Rough 932°C (1710°F), finish 843°C (1550°F)

•         Annealing – 704°C (1300°F), 2hr, AC

•         Solution Treating – 843-913°C (1550-1675°F), 1hr, WQ.

•         Ageing – 538-621°C (1000-1150°F), 4-8hr, AC.

•         Stress Relief Annealing – 593°C (1100°F), 2 hrs, AC.

Applications

As mentioned previously, this alloy is primarily used in airframes.

Source: Titanium Information Group.

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

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