Data sheet AA7075
General properties
Aluminium-zinc - magnesium - copper alloy, coming from aerospace (where it is still widely used in T7xx tempers), used also for other demanding applications, whose main properties are high strength, and very good machinability. In general machinery it is traditionally used in T6xx tempers (T651 for plates), that gives peak strength but can show problems with SCC. The alloy is rather quench sensitive, and therefore strength decreases quickly with increasing thickness.
Generally used in form of sheets, plates, rods, bars, tubes.
Ex stock the following tempers are available:
- T6 (sheets, bars and tubes)
- T651 (plates).
- T7351 (plates)
- T7651 (plates)
Other tempers are delivered upon request; sheets are manufactured also with cladding.
Typical applications
Structural components with demanding requirements in terms of strength; critical parts.
Minimum mechanical properties at room temperature
Sheets and plates
| Stato | Thickness (mm) | Rm (MPa) | Rp0.2 (MPa) | A % | Bending radius (1) (2) | BHN (1) | |
T6 T651 |
0.04 | 0.08 | 525 | 460 | 6 | 4.5 x s | 157 |
| 0.08 | 1.05 | 540 | 460 | 6 | 5.5 x s | 160 | |
| 1.05 | 3 | 540 | 470 | 7 | 6.5 x s | 161 | |
| 3 | 6 | 545 | 475 | 8 | 8 x s | 163 | |
| 6 | 12.05 | 540 | 460 | 8 | 12 x s | 160 | |
| 12.05 | 25 | 540 | 470 | 6 | 161 | ||
| 25 | 50 | 530 | 460 | 5 | 158 | ||
| 50 | 60 | 525 | 440 | 4 | 155 | ||
| 60 | 80 | 495 | 420 | 4 | 147 | ||
| 80 | 90 | 490 | 390 | 4 | 144 | ||
| 90 | 100 | 460 | 360 | 3 | 135 | ||
| 100 | 120 | 410 | 300 | 2 | 119 | ||
| 120 | 150 | 360 | 260 | 2 | 5.0 x s | 104 | |
| T7351 | 12.05 | 25 | 475 | 390 | 6 | 140 | |
| 25 | 50 | 475 | 390 | 5 | 140 | ||
| 50 | 60 | 455 | 360 | 5 | 133 | ||
| 60 | 76 | 440 | 340 | 5 | 129 | ||
| 76 | 89 | 433 | 336 | 5 | 127 | ||
| 89 | 101 | 420 | 330 | 5 | 123 | ||
| T7651 | 12.05 | 25 | 487 | 412 | 6 | 143 | |
| 25 | 38 | 487 | 412 | 5 | 143 | ||
| 38 | 50 | 487 | 412 | 5 | 143 | ||
(1) Reference values
(2)Bending at 90°
Bars
Temper |
Thickness (mm) |
Rm (MPa) | Rp0.2 (MPa) |
A % |
T6 |
Up to 25 | 540 | 480 | 7 |
| From 25 to 100 | 560 | 500 | 7 | |
| From 100 to 150 | 530 | 470 | 6 | |
| From 150 to 200 | 470 | 400 | 5 |
Tubes
Temper |
Thickness (mm) |
Rm (MPa) | Rp0.2 (MPa) |
A % |
T6 |
Up to 5 | 540 | 485 | 6 |
| From 5 to 10 | 560 | 505 | 5 | |
| From 10 to 50 | 560 | 495 | 4 |
Physical properties
Specific gravity 2.81 g/cm3 at 20 °C
Thermal conductivity at 20 °C: 117 W/m °C
Elastic modulus: 71100 Mpa
Linear thermal expansion coefficient
Temperature °C |
10-6 mm/mm °C |
-50 > 20 |
21.8 |
20 > 100 |
23.6 |
100 > 200 |
24.5 |
200 > 300 |
|
Technological properties
Ease of machining: good
Ease of cold forming; very poor in T6 and T7 temper; good in 0 temper
Ease of welding: avoid welding (TIG - MIG)