2219 aluminium alloy
2219 aluminium alloy is an alloy in the wrought aluminium-copper family. It can be heat-treated to produce tempers with higher strength but lower ductility. The aluminium-copper alloys have high strength, but are generally less corrosion resistant and harder to weld than other types of aluminium alloys. To compensate for the lower corrosion resistance, 2219 aluminium can be clad in a commercially pure alloy such as 1050 or painted. This alloy is commonly formed by both extrusion and forging, but is not used in casting.
The 2219 aluminium alloy in particular has high fracture toughness, is weldable and resistant to stress corrosion cracking, therefore it is widely used in supersonic aircraft skin and structural members. The Space Shuttle Standard Weight Tank was also fabricated from the 2219 alloy.
Alternate designations include AlCu6Mn and A92219. It is described in the following standards:
- ASTM B 209: Standard Specification for Aluminum and Aluminum-Alloy Sheet and Plate
- ASTM B 211: Standard Specification for Aluminum and Aluminum-Alloy Bar, Rod, and Wire
- ASTM B 221: Standard Specification for Aluminum and Aluminum-Alloy Extruded Bars, Rods, Wire, Profiles, and Tubes
- ISO 6361: Wrought Aluminium and Aluminium Alloy Sheets, Strips and Plates
The alloy composition of 2219 aluminium is:
- Aluminium: 91.5 to 93.8%
- Copper: 5.8 to 6.8%
- Iron: 0.3% max
- Magnesium: 0.02% max
- Manganese: 0.2 to 0.4%
- Silicon: 0.2% max
- Titanium: 0.02 to 0.10%
- Vanadium: 0.05 to 0.15%
- Zinc: 0.1% max
- Zirconium: 0.10 to 0.25%
- Residuals: 0.15% max
