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	PRODUCT DATA of Ti 6Al 4V

Material

Ti 6Al 4V

Product Datasheet

Timet6-4 TIMETAL_6-4

General Information

A two-phase alloy, containing both alpha and beta phase crystalline structures. This high strength alloy can be used at cryogenic temperatures to about 427°C.

Use in Spacecraft

Most widely used general purpose structural Ti-alloy, as both sheet and forgings

Processing and Assembly

The alloy is age hardenable by heat treatment to achieve higher strengths

Precautions

Strong affinity for hydrogen (above 130 C), nitrogen (above 800 C) and oxygen above 700 C which cause embrittlement

Chemical Composition

6% Al, 4% V, Rem. Ti

Name of Manufacturer

TIMET The Hub,Holford Road, Witton, Birmingham B6 7AX, UK +44 121 356-1155 EuroSales@timet.com +44 121 356-5413 www.timet.com RMI Titanium 1000 Warren Avenue, Niles, Ohio 44446 (330) 544-7633 (330) 544-7796 www.rmititanium.com Riverside Estate, Fazeley, Tamworth, Staffordshire B78 3RW, UK 44-1-827-262266 44-1-827-262367

	EXPERIENCE IN PRACTICE

Development Status

Commercial Product

Cost Range

Low to Medium

Equivalent Designations

Timetal 6-4, IMI318, UNS R56400, UNS R56401, grade 5, Werk No. 3.7164, Ti6Al4V,Ti-6Al4V

Space Experience

Good

	PHYSICAL PROPERTIES

Specific Gravity

4.42

Phase changes

The alloy transforms on cooling from beta to alpha+beta at 954 to 982 C for sheet, 968 to 1010 C for bar

Magnetic Properties

Nonmagnetic

	ELASTIC PROPERTIES

Tensile Modulus

110 GPa

Shear Modulus

41 to 45 GPa

Poisson Ratio

0.31

	ELECTRICAL PROPERTIES

Electrical Volume Resistivity

1.68e-8 ohm.m

	THERMAL PROPERTIES

Thermal Conductivity

6 W/m.K

Thermal Expansion Coefficient

9.0 μstrain/°C

Specific Heat

0.526 J/g.K

Melting Range

1604 to 1660 °C

	RELEVANT PROPERTIES FOR USE IN SPACE COMMUNITY

Corrosion/Thermal

Oxidation resistant with retention of useful strength and creep resistance up to 500°C. Strong affinity for H2 (above 130°C), N2 (above 800°C) and O2 (above 700°C), which cause embrittlement.

Stress Corrosion Status

High Resistance to SCC: Table 1 Data Quality: Design Data

EMF vs SCE

-0.24 V Remark:measured in 3.5% NaCl solution

Bimetallic Corrosion

Can be connected without any restriction to: Cr, Cu, Brass, Cu-Ni alloys, Al-bronzes, Si-bronzes, Gun metal, P-bronzes, Sn-bronzes, Ag, 300 and 400 series stainless steel, low alloy steel, Au, Pt, C, Rh Can be connected in a non-controlled environment to the above and Ni, Monel, Inconel, Ni-Mo alloys Can be connected in a clean room environment to above and Cd, Al-Cu alloys Needs specific measures: All others Test:ECSS-Q-ST-70C Rev.1 Table 5.1 Data Quality: Design Data

Welding

very good Nitrogen, hydrogen, carbon dioxide, and mixtures containing these gases shall not be used Welding with alloy-matching fillers is recommended, preferably using extra Low Interstitial (ELI) filler wires

	SPECIAL RECOMMENDATIONS

Special Recommendations

Alloy possesses poor notch sensitivity characteristics, so considerable care should be taken to avoid the presence of stress raisers. Methyl alcohol should not be used in the pressure testing of tanks since failure can occur due to stress-corrosion cracking.

Lessons Learned

Welding procedures should always be checked. Argon or helium protection is essential on trailing direction and opposite side. Specifications for Ti 6Al-4V mill products typically specify a maximum hydrogen limit of about 150 ppm.