Properties This article has property data, click to view

Titanium Alloys - Ti4Al4Mo2Sn Properties and Applications

Aug 14 2003

Chemical Formula

Ti4Al4Mo2Sn

Background

Also called Ti-4-4-2, this high strength forging alloy is used primarily for engine compressor blades and discs, as well as various airframe forgings. The high silicon content extends its useful strength and creep resistance into the intermediate temperature ranges up to 400°C (750°F).

Composition

Table 1. The composition of Ti4Al4Mo2Sn.

Content

Al

3.0-5.0%

Sn

1.5-2.5%

Mo

3.0-5.0%

Si

0.3-0.7%

O2

0.16-0.2%

Fe

<0.2%

C

<0.05%

N2

<0.03%

H2

<0.015%

Ti

Balance

Designations

Other designations for Ti4Al4Mo2Sn include:

•         BSTA 45 to 51

•         BSTA 57

Key Properties

Physical Properties

Table 2. Typical physical properties for Ti4Al4Mo2Sn.

Property

Typical Value

Density g/cm3 (lb/ cu in)

4.60 (0.166)

Volume Electrical Resistivity µohm.cm (µohm.in)

160 (63)

Thermal Conductivity W/m.K (BTU.in/ft2.hr)

7.6 (53)

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

8.8 (4.9)

Mean Thermal Expansion Co-eff 20-200°C /°C (/°F)

9.0 (5.0)

Mean Thermal Expansion Co-eff 20-300°C /°C (/°F)

9.2 (5.1)

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

9.3 (5.2)

Mean Thermal Expansion Co-eff 20-500°C /°C (/°F)

9.7 (5.4)

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

10.1 (5.6)

Beta Transus °C±15°C (°F)

975 (1787)

Mechanical Properties

Table 3. Typical mechanical properties for Ti4Al4Mo2Sn.

Property

Minimum

Typical

Tensile Strength MPa (ksi) sheet

1104 (160)

1138 (165)

0.2% Proof Stress MPa (ksi)

959 (139)

1035 (150)

Elongation over 2 inches %

9

12

Reduction in Area %

38

Elastic Modulus GPa (Msi)

114 (17)

Fabrication

Related Stories

•         Annealing – 900°C (1650°F), 30 min AC

•         Solution Treating - 900°C (1650°F), 30 min AC or fast AC

•         Ageing - 500°C (900°F), 24 hr AC

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

Applications

As mentioned above, Ti4Al4Mo2Sn is suited to engine compressor blades and discs, as well as various airframe forgings.

Source: The Titanium Information Group

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

Tell Us What You Think

Do you have a review, update or anything you would like to add to this article?

Leave your feedback
(Logout)
Your comment type
Submit

Sponsored Content

Editorial Highlights

The Current State of the Global Semiconductor Market

The Current State of the Global Semiconductor Market

The global semiconductor market has entered an exciting period. Demand for chip technology is both driving the industry as well as hindering it, with current chip shortages predicted to last for some time. Current trends will likely shape the future of the industry, which is set to continue to show

How are Graphene Batteries Made?

How are Graphene Batteries Made?

The primary distinction between graphene-based batteries and solid-state batteries lies in the composition of either electrode. Although the cathode is commonly changed, carbon allotropes can also be employed in fabricating anodes.

Newsletters you may be interested in

See all Newsletters »

Terms

While we only use edited and approved content for Azthena answers, it may on occasions provide incorrect responses. Please confirm any data provided with the related suppliers or authors. We do not provide medical advice, if you search for medical information you must always consult a medical professional before acting on any information provided.

Your questions, but not your email details will be shared with OpenAI and retained for 30 days in accordance with their privacy principles.

Please do not ask questions that use sensitive or confidential information.

Read the full Terms & Conditions.

Provide Feedback