Data sheet AA7050
General properties
Aluminium - zinc - magnesium - copper alloy, aerospace, whose main properties are top values of mechanical strength, both static and fatigue, low quench sensitivity (that allows reaching high strength also on thick sections), high fracture toughness, good resistance to SCC, very good machinability associated to fair dimensional stability.
Generally used in form of plate.
Ex stock T451 temper is available; other tempers can be delivered on demand.
Typical applications
Critical parts, with complex shape, highly stressed both statically and in fatigue, specially for outdoor service.
Minimum mechanical properties at room temperature
Temper |
Thickness (mm) |
Rm (MPa) |
Rp0.2 (MPa) |
A % |
BHN (1) |
|
T7451 |
6 | 38 | 508 | 439 | 9 | 160 |
| 38 | 50 | 508 | 439 | 9 | 160 | |
| 50 | 76 | 501 | 432 | 6 | 160 | |
| 76 | 101 | 494 | 425 | 6 | 155 | |
| 101 | 127 | 487 | 418 | 5 | 155 | |
| 127 | 152 | 480 | 411 | 4 | 155 | |
(1) Typical values
Physical properties
Specific gravity 2.83 g/cm3 at 20 °C
Thermal conductivity at 20 °C: 157 W/m °C
Elastic modulus: 70700 Mpa
Elastic modulus (shear): 26800 Mpa
Poisson's ratio: 0.33
Linear thermal expansion coefficient
Temperature °C |
10-6 mm/mm °C |
-50 > 20 |
21.7 |
20 > 100 |
23.5 |
100 > 200 |
24.4 |
200 > 300 |
|
Technological properties
Ease of machining: very good
Ease of welding: avoid welding (TIG - MIG)
Fatigue strength:
The following graphs show fatigue data in tension for different notch factors and stress ratios, following the US data presentation tradition.
For info on symbols see section Info.
Fracture toughness
The following graph shows crack propagation data versus stress intensity factor range, following the US data presentation tradition.
For info on symbols see section INFO
