Sep 26 2012
Topics Covered
Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Other Designations
Fabrication and Heat Treatment
Annealing
Cold Working
Welding
Forging
Forming
Machinability
Heat Treatment
Hot Working
Hardening
Aging
Applications
Introduction
Aluminium / Aluminum alloys feature strong corrosion resistance
characteristics. These alloys are defined as good low-temperature
alloys with high electrical conductivity. Aluminium / Aluminum alloys
gain strength when exposed to subzero temperatures and lose strength
when these alloys are exposed to high temperatures. Aluminium /
Aluminum alloys are sensitive to high temperatures ranging between 200
and 250°C (392 and 482°F).
The following datasheet provides an overview of Aluminium / Aluminum
2124 alloy.
Chemical Composition
The chemical composition of Aluminium / Aluminum 2124 alloy is
outlined in the following table.
| Element |
Content
(%) |
| Aluminium / Aluminum, Al |
93.50 |
| Copper, Cu |
4.4 |
| Magnesium, Mg |
1.5 |
| Manganese, Mn |
0.6 |
Physical Properties
The following table shows the physical properties of Aluminium /
Aluminum 2124 alloy.
| Properties |
Metric |
Imperial |
| Density |
2.6-2.8 g/cm3 |
0.0939-0.1011 lb/in3 |
| Melting point |
510°C |
950°F |
Mechanical Properties
The mechanical properties of Aluminium / Aluminum 2124 alloy are
displayed in the following table.
| Properties |
Metric |
Imperial |
| Elastic modulus |
70-80 GPa |
10152-11603 ksi |
| Poisson's ratio |
0.33 |
0.33 |
Thermal Properties
The thermal properties of Aluminium / Aluminum 2124 alloy are given
in the following table.
| Properties |
Conditions |
| T
(ºC) |
Treatment |
| Thermal conductivity |
191 (W/mK) |
25 |
O |
Other Designations
Equivalent materials to Aluminium / Aluminum 2124 alloy are:
- AMS 4221
- ASTM B209
- QQ A-250/29
- QQ A250/9
Fabrication and Heat Treatment
Annealing
Aluminium / Aluminum 2124 alloy is annealed at 413°C (775°F) for 2
to 3 hours. The alloys is then cooled at 10°C (50°F) per hour to 260°C
(500°F) and finally cooled in air.
Cold Working
Aluminium / Aluminum 2124 alloy is cold worked to a limited extent
in comparison to other Aluminium / Aluminum alloys.
Welding
Resistance welding is recommended for Aluminium / Aluminum 2124
alloy. Arc welding and gas welding are not recommended for this alloy.
Forging
Aluminium / Aluminum 2124 alloy can be forged.
Forming
Aluminium / Aluminum 2124 alloy can be formed in a limited manner
and severe cold working is not recommended for this alloy.
Machinability
Conventional methods are used for the machining process of Aluminium
/ Aluminum 2124 alloy.
Heat Treatment
Aluminium / Aluminum 2124 alloy can be solution annealed at 493°C
(920°F) and then water quenched. The T 851 temper is produced when
precipitation hardening is performed for 12 hours at 190°C (375°F) that
is followed by air cooling.
Hot Working
Hot working for Aluminium / Aluminum 2124 alloy is not recommended
as this alloy has the tendency to crack due to heat input.
Hardening
Aluminium / Aluminum 2124 alloy is hardened by the precipitation
hardening method for 12 hours at 190°C (375°F) and then cooled in air.
Aging
Aging for Aluminium / Aluminum 2124 alloy is done at 190°C (375°F)
for about 12 hours and the alloy is then cooled in air.
Applications
Aluminium / Aluminum 2124 alloy is used in aircraft structures
amongst other things.