Sep 18 2012
Topics Covered
IntroductionChemical CompositionPhysical PropertiesMechanical PropertiesThermal PropertiesOther DesignationsFabrication and Heat Treatment Forming Welding Heat Treatment Cold Working Aging HardeningApplications
Introduction
Aluminum alloys have high strength at subzero temperatures. However, their strength can be reduced at high temperatures.
Aluminium / Aluminum 7050 alloy is a heat treatable alloy. It has high toughness, strong mechanical strength, and good stress corrosion cracking resistance. The following datasheet gives an overview of Aluminium / Aluminum 7050 alloy.
Chemical Composition
The following table shows the chemical composition of Aluminium / Aluminum 7050 alloy.
| Element |
Content (%) |
| Aluminum, Al |
89 |
| Copper, Cu |
2.3 |
| Magnesium, Mg |
2.3 |
| Zinc, Zn |
6.2 |
| Zirconium, Zr |
0.12 |
Physical Properties
The physical properties of Aluminium / Aluminum 7050 alloy are tabulated below.
| Properties |
Metric |
Imperial |
| Density |
2.6-2.8 g/cm3 |
0.0939-0.101 lb/in3 |
| Melting point |
494°C |
920°F |
Mechanical Properties
The mechanical properties of Aluminium / Aluminum 7050 alloy are outlined in the following table.
| Properties |
Metric |
Imperial |
| Tensile strength |
515 MPa |
74695 psi |
| Yield strength |
455 MPa |
65992 psi |
| Fatigue strength |
240 MPa |
34809 psi |
| Elastic modulus |
70-80 GPa |
10153-11603 ksi |
| Poisson's ratio |
0.33 |
0.33 |
| Elongation |
11% |
11% |
Thermal Properties
The thermal properties of Aluminium / Aluminum 7050 alloy are given in the following table.
| Properties |
Conditions |
| T (ºC) |
Treatment |
| Thermal conductivity |
180 W/mK |
25 |
- |
Other Designations
Other designations that are equivalent to Aluminium / Aluminum 7050 alloy include:
- AMS 4108
- AMS 4201
- ASTM B247
- ASTM B316
- QQ A-430
Fabrication and Heat Treatment
Forming
Aluminium / Aluminum 7050 alloy can be formed in O temper or heat treated conditions.
Welding
Aluminium / Aluminum 7050 alloy should not be welded in order to prevent cracking and development of porosity. The weld joint produced will be weaker than the parent metal. Gas tungsten or gas metal arc welding methods are not preferred for welding this alloy.
Heat Treatment
Aluminium / Aluminum 7050 alloy can be heat treated at 477°C (890°F). The time taken for this process is based upon the thickness of the section.
Cold Working
Aluminium / Aluminum 7050 alloy can be cold worked using conventional methods.
Aging
Aluminium / Aluminum 7050 alloy is aged using two-stage heat treatment. It is heated at 122°C (250°F) for 3 to 6 h. It is again heated at 163°C (325°F) for 15 h followed by cooling in air.
Hardening
Aluminium / Aluminum 7050 alloy can be hardened by precipitation heat treatment.
Applications
Aluminium / Aluminum 7050 alloy is mainly used in manufacturing aircraft and other structures.