A.4.2. Timetal 6-4 (IMI 318)
PRODUCT
Type			Metal Alloy
Chemical Composition			6% Al, 4% V, Rem. Ti
Manufacturer	Timet PO Box 704, Witton Birmingham B6 7UR UK			Tel: +44 121 356-1155 Fax: +44 121 356-5413 Email: EuroSales@timet.com www.timet.com
EXPERIENCE & AVAILABILITY
Development Status			Commercial Product
Cost Range			Low to Medium
Lot Reproducibility			AMS 4911; 4928, BS TA10; 11, AFNOR TA6V, Werk. No. 3.7164
Space Experience			Good
GENERAL PROPERTIES (Physical, Mechanical, Thermal, Electrical, Optical)
Nature			Typical Value		Remarks
Specific Gravity			4.42		@ Room Temperature
Ultimate Tensile Strength			924 to 1155 MPa		@ Room Temperature
Proof Stress (0.2%)			847 to 1078 MPa		@ Room Temperature
Elongation at Break			10 to 12%		@ Room Temperature
Thermal Expansion Coefficient			7.9 x 10^-6 °C^-1		@ Room Temperature
Thermal Conductivity			6 W m^-1 °C^-1		@ Room Temperature
Electrical Resistivity			1.68 x 10^-6 W m		@ Room Temperature
PROPERTIES RELEVANT TO SPACE USE
Nature		Typical Value				Type of Test
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		High resistance (see note).
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.