Aluminium alloy 2024
is an aluminium alloy
, with copper
as the alloying elements. It is used in applications requiring high strength to weight ratio, as well as good fatigue
resistance. It is not weldable
, and has average machinability
. Due to poor corrosion
resistance, it is often clad with aluminium
or Al-1Zn for protection, although this may reduce the fatigue strength.
Aluminum alloy 2024 has a density
of 2.73 g/cm³ (0.098 lb/in³).
The mechanical properties of 2024 depend greatly on the temper
of the material.
2024-O temper aluminium has no heat treating. It has a maximum tensile strength
of 30,000-32,000 psi (207-220 MPa), and maximum yield strength
of no more than 14,000 psi (96 MPa). The material has elongation (stretch before ultimate failure) of 10-12%.
T3 temper 2024 sheet has an ultimate tensile strength of 58,000-62,000 psi (400-427 MPa) and yield strength of at least 39,000-40,000 psi (269-276 MPa). It has elongation of 10-15%.
T351 temper 2024 plate has an ultimate tensile strength of 68 ksi (470 MPa) and yield strength of 41 kpsi (280 MPa). It has elongation of 19%.
Due to its high strength and fatigue resistance, 2024 is widely used in aircraft
structures, especially wing
structures under tension.