Aluminum 2218 Alloy (UNS A92218)

Topics Covered

Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties


Aluminium / aluminum is a very useful material and over the years its range of application has widened immensely. It is a very malleable and ductile such that it is possible to roll it into sheets as thin as 0.0017 in. It can also be drawn into wire 0.004 in. in diameter.

In the aluminium / aluminum 2xxx series, copper is the chief alloying element. These alloys have very high mechanical strength after heat treatment. Aluminium / aluminum 2218 alloy is a heat treatable wrought alloy.

The following datasheet will provide more details about aluminium / aluminum 2218 alloy.

Chemical Composition

The following table shows the chemical composition of aluminium / aluminum 2218 alloy.

Element Content (%)
Aluminum, Al 92.50
Copper, Cu 4
Nickel, Ni 2
Magnesium, Mg 1.5

Physical Properties

The physical properties of aluminium / aluminum 2218-T71 alloy are outlined in the following table.

Properties Metric Imperial
Density 2.82 g/cm³ 0.102 lb/in³
Melting point 507 - 638°C 945 - 1180°F

Mechanical Properties

The mechanical properties of aluminium / aluminum 2218 –T71 alloy are tabulated below.

Properties Metric Imperial
Tensile strength 345 MPa 50000 psi
Yield strength 280 MPa 40600 psi
Elongation at break 11% 11%
Poisson’s ratio 0.33 0.33
Elastic modulus 74.4 GPa 10800 ksi
Shear strength 207 MPa 30000 psi
Hardness, Brinell (@load 500 kg; thickness 10.0 mm/1100 lb;0.394 in) 105 105
Hardness, Knoop (converted from Brinell hardness value) 132 132
Hardness, Rockwell A (converted from Brinell hardness value) 43 43
Hardness, Rockwell B (converted from Brinell hardness value) 66 66
Hardness, Vickers (converted from Brinell hardness value) 118 118

Thermal Properties

The thermal properties of aluminum 2218 alloy are provided below.

Properties Conditions
T (°C) Treatment
Thermal conductivity 148 W/mK 25 T61
Thermal expansion 22.3 x 10-6/°C 20-100 -


Aluminium / aluminum 2218 alloy is chiefly used in areas such as electrical conductors and transport.

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