A.1.2. Aluminium-Copper Alloy (ISO AlCu4Mg1)
PRODUCT
Type			Metal Alloy
Chemical Composition			4.5% Cu, 1.5% Mg, 0.6% Mn, Rem. Al
Manufacturer	Corus 30 Millbank London SW1 4WY UK			Tel: 0800 008 400 Fax: Email: customer-services@corusgroup.com www.corusgroup.com
	Aluminium Pechiney Usine de Mercus 09400 Mercus Garrabet France			Tel: +33 (0)5 61 02 42 00 Fax: +33 (0)5 61 02 42 01 Email: www.aluminium-pechiney.com
	Corus Metallversteib Deutschland Kennedydamm 17 D-40476 Dusseldorf Germany			Tel: +49 211 4926-0 Fax: +49 211 4926-282 Email:
EXPERIENCE & AVAILABILITY
Development Status			Commercial Product
Cost Range			Very Low
Lot Reproducibility			BS L97, BS L98, AFNOR A-U4G1, DIN 1725, AA 2024
Space Experience			Good
GENERAL PROPERTIES (Physical, Mechanical, Thermal, Electrical, Optical)
Nature			Typical Value		Remarks
Specific Gravity			2.77		@ Room Temperature
Ultimate Tensile Strength			385 to 495 MPa		@ Room Temperature
Proof Stress (0.2%)			260 to 470 MPa		@ Room Temperature
Elongation at Break			3% to 16%		@ Room Temperature
Thermal Conductivity			150 to 180 W m^-1 °C^-1		@ Room Temperature
Thermal Expansion Coefficient			22 to 24 x 10^-6 °C^-1		@ Room Temperature
Electrical Resistivity			8.9 x 10^-8 W m		@ Room Temperature
PROPERTIES RELEVANT TO SPACE USE
Nature		Typical Value				Type of Test
Corrosion		Relatively poor resistance to atmospheric corrosion and should always be anodised or chromated and painted.
Stress Corrosion		Only limited forms and temper conditions have high resistance to stress corrosion cracking. (Refer to ECSS-Q-70-36 for approval of this alloy). Furthermore, only rod and bar forms in the T8 condition have a high resistance. Plate, extrusions and forgings have moderate to low resistance.
SPECIAL RECOMMENDATIONS
· For precipitation hardened parts, heating above the precipitation temperature may result in susceptibility to intergranular and stress corrosion. · The room-temperature-aged conditions may become susceptible to intergranular corrosion if the alloy is heated above 65°C.