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PRODUCT DATA of Ti 6Al 4V
MaterialTi 6Al 4V
Product DatasheetTimet6-4
TIMETAL_6-4
General InformationA 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 SpacecraftMost widely used general purpose structural Ti-alloy, as both sheet and forgings
Processing and AssemblyThe alloy is age hardenable by heat treatment to achieve higher strengths
PrecautionsStrong affinity for hydrogen (above 130 C), nitrogen (above 800 C) and oxygen above 700 C which cause embrittlement
Chemical Composition6% Al, 4% V, Rem. Ti
Name of ManufacturerTIMET
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 StatusCommercial Product
Cost RangeLow to Medium
Equivalent DesignationsTimetal 6-4, IMI318, UNS R56400, UNS R56401, grade 5, Werk No. 3.7164, Ti6Al4V,Ti-6Al4V
Space ExperienceGood
PHYSICAL PROPERTIES
Specific Gravity4.42
Phase changesThe alloy transforms on cooling from beta to alpha+beta at 954 to 982 C for sheet, 968 to 1010 C for bar
Magnetic PropertiesNonmagnetic
ELASTIC PROPERTIES
Tensile Modulus110 GPa
Shear Modulus41 to 45 GPa
Poisson Ratio0.31
ELECTRICAL PROPERTIES
Electrical Volume Resistivity1.68e-8 ohm.m
THERMAL PROPERTIES
Thermal Conductivity6 W/m.K
Thermal Expansion Coefficient9.0 μstrain/°C
Melting Range1604 to 1660 °C
Specific Heat0.526 J/g.K
RELEVANT PROPERTIES FOR USE IN SPACE COMMUNITY
Corrosion/ThermalOxidation 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 StatusHigh Resistance to SCC: Table 1
Data Quality: Design Data
EMF vs SCE-0.24 V
Remark:measured in 3.5% NaCl solution
Bimetallic CorrosionCan 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
Weldingvery 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 RecommendationsAlloy 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 LearnedWelding 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.