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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:

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)

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