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Titanium Alloys - Ti15V3Cr3Sn3Al Properties and Fabrication

May 13 2003

Chemical Formula

Ti15V3Cr3Sn3Al

Background

This metastable beta alloy is used primarily in sheet metal applications, since it is strip producible, age hardenable and highly cold formable. It is used in a variety of airframe applications, in many vases replacing hot formed Ti6Al4V. It can also be produced as foil and is an excellent casting alloy. Ti15V3Cr3Sn3Al has also been evaluated for aerospace tankage applications, high strength hydraulic tubing and fasteners.

Composition

Table 1. The composition of Ti15V3Cr3Sn3Al.

Content

C

<0.05%

N2

<0.03%

O2

<0.13%

Al

2.5-3.5%

Fe

<0.3%

V

14-16.0%

Cr

2.5-3.5%

Sn

2.5-3.5%

H2

<0.15%%

Ti

Balance

Designations

Other designations for Ti15V3Cr3Sn3Al include:

•         AMS 4914

Key Properties

Physical Properties

Table 2. Typical physical properties for Ti15V3Cr3Sn3Al.

Property

Typical Value

Density g/cm3 (lb/ cu in)

4.17 (0.15)

Melting Range °C±15°C (°F)

1524 (2775)

Specific Heat J/kg/°C (BTU/lb°F)

500 (.119)

Volume Electrical Resistivity µohm.cm (µohm.in)

147 (58)

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

8.1 (56)

Beta Transus °C±15°C (°F)

790 (1400)

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

9.7x10-6 (5.4)

Mechanical Properties

Table 3. Typical mechanical properties for Ti15V3Cr3Sn3Al.

Property

Minimum

Typical Value

Tensile Strength MPa (ksi)

1000 (145)

1131 (164)

0.2% Proof Stress MPa (ksi)

966 (140)

1035 (150)

Elongation over 2 inches %

7

11

Elastic Modulus GPa (msi)

103 (15)

Specified bend Radius <0.070in x thickness

2.0

Specified bend Radius >0.070in x thickness

2.5

Related Stories

Fabrication

•         Forging – Rough 982-1093°C (1800-2000°F), Finish 816-927°C (1500-1700°F)

•         Solution Treating – 788-816°C (1450-1500°F), 3-30min, AC.

•         Ageing – 538°C (1000°F), 8 hrs, AC.

•         Stress Relief Annealing – 538-649°C (1000-1200°F)

•         Weldability - Good

Source: The Titanium Information Group

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

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