May 21 2013
Topics Covered
Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Applications
Introduction
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 |
- |
Applications
Aluminium / aluminum 2218 alloy is chiefly used in areas such as electrical conductors and transport.