2024 aluminium alloy
2024 aluminium alloy is an aluminium alloy, with copper as the primary alloying element. It is used in applications requiring a high strength-to-weight ratio, as well as good fatigue resistance. It is weldable only through friction welding because of the likelihood of solidification defects that may arise during fusion welding. Due to poor corrosion resistance, it is often clad with aluminium or Al-1Zn for protection, although this may reduce the fatigue strength. Its machinability is average. In older systems of terminology, 2XXX series alloys were known as duralumin, and this alloy was named 24ST.
2024 is commonly extruded, and also available in alclad sheet and plate forms. It is not commonly forged; the related 2014 aluminium alloy is, though.
Basic properties
Aluminium alloy 2024 has a density of 2.78 g/cm3, electrical conductivity of 30% IACS, Young's modulus of 73 GPa across all tempers, and begins to melt at.Chemical composition
The alloy composition of 2024 is:- Aluminium
- Silicon no minimum, maximum 0.5% by weight
- Iron no minimum, maximum 0.5%
- Copper minimum 3.8%, maximum 4.9%
- Manganese minimum 0.3%, maximum 0.9%
- Magnesium minimum 1.2%, maximum 1.8%
- Chromium no minimum, maximum 0.1%
- Zinc no minimum, maximum 0.25%
- Titanium no minimum, maximum 0.15%
- Other elements no more than 0.05% each, 0.15% total