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Titanium Alloys - Ti2.5Cu Properties and Applications

May 13 2003

Chemical Formula

Ti2.5Cu

Background

Ti2.5Cu combines the formability and weldability of unalloyed titanium with improved mechanical properties and a useful creep resistance up to 350°C (660°F). It has primarily found applications in the aerospace industry for components such as the keel and fan casing in the Tornado, airframe sheet in the Jaguar and fan casing in the Rolls Royce RB 211-524. It is also used for the firewalls and forgings in Airbus’.

Composition

Table 1. The composition of Ti2.5Cu.

Content

Cu

2.0-3.0%

Fe

<0.02%

H2

<0.02%

Ti

Balance

Designations

Other designations for Ti2.5Cu include:

•         BS TA21 Sheet

•         BS TA22 Bar

•         BS TA23 Forging Stock

•         BS TA24 Forgings

•         BS TA52 Sheet

•         BS TA53 Bar to 75mm

•         BS TA54 Forging Stock to 75mm

•         BS TA55 Forgings to 75mm ruling section

•         BS TA 58 Plate

Key Properties

Physical Properties

Table 2. Typical physical properties for Ti2.5Cu.

Property

Typical Value

Density g/cm3 (lb/ cu in)

4.54 (0.164)

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

8.73x10-6 (4.8)

Mean Thermal Expansion Co-Efficient 20-200°C/°C (68-360°F/°F)

9.02x10-6 (4.8)

Mean Thermal Expansion Co-Efficient 20-300°C/°C (68-572°F/°F)

9.10x10-6 (4.8)

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

9.29x10-6 (4.8)

Mean Thermal Expansion Co-Efficient 20-500°C/°C (68-932°F/°F)

9.47x10-6 (4.8)

Mean Thermal Expansion Co-Efficient 20-600°C/°C (68-1080°F/°F)

9.46x10-6 (5.4)

Beta Transus °C±15°C (°F)

895 (1643)

Mechanical Properties

Table 3. Typical mechanical properties for Ti2.5Cu.

Property

Minimum

Typical Value

Tensile Strength MPa (ksi) sheet

540 (78)

Tensile Strength MPa (ksi) bar

540 (78)

Tensile Strength MPa (ksi) plate

520 (75)

0.2% Proof Stress MPa (ksi) sheet

460 (67)

1035 (150)

0.2% Proof Stress MPa (ksi) bar

400 (58)

0.2% Proof Stress MPa (ksi) plate

420 (61)

Elongation over 5D % bar

16

Elongation over 5D % plate

20

Reduction in Area % bar

35

Bend Radius 180° x Thickness (sheet)

2

Solution heat treated and aged, Tensile Strength MPa (ksi) sheet

690 (100)

Tensile Strength MPa (ksi) forging

650 (94)

0.2% Proof Stress MPa (ksi) sheet

550 (80)

0.2% Proof Stress MPa (ksi) forging

525 (76)

Elongation over 5D % forging

10

Reduction in Area % forging

25

Source: The Titanium Information Group

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

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