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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.

Fatigue strength in tension

Fatigue strength in tension

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

Crack propagation rate

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