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7175 (AlZn5.5MgCu(B), 3.4334) Aluminum

7175 aluminum is a 7000-series aluminum alloy: the main alloying addition is zinc and it is formulated for primary forming into wrought products. 7175 is the Aluminum Association (AA) designation for this material. In European standards, it will be given as EN AW-7175. Additionally, the EN chemical designation is AlZn5,5MgCu(B). And the UNS number is A97175.

It originally received its standard designation in 1957.

The properties of 7175 aluminum include three common variations. This page shows summary ranges across all of them. For more specific values, follow the links immediately below. The graph bars on the material properties cards further below compare 7175 aluminum to: 7000-series alloys (top), all aluminum alloys (middle), and the entire database (bottom). A full bar means this is the highest value in the relevant set. A half-full bar means it's 50% of the highest, and so on.

Mechanical Properties

Elastic (Young's, Tensile) Modulus

70 GPa 10 x 106 psi

Elongation at Break

3.8 to 5.9 %

Fatigue Strength

150 to 180 MPa 22 to 26 x 103 psi

Poisson's Ratio

0.32

Shear Modulus

26 GPa 3.8 x 106 psi

Shear Strength

290 to 330 MPa 42 to 48 x 103 psi

Tensile Strength: Ultimate (UTS)

520 to 570 MPa 75 to 82 x 103 psi

Tensile Strength: Yield (Proof)

430 to 490 MPa 62 to 71 x 103 psi

Thermal Properties

Latent Heat of Fusion

380 J/g

Maximum Temperature: Mechanical

180 °C 350 °F

Melting Completion (Liquidus)

640 °C 1180 °F

Melting Onset (Solidus)

480 °C 890 °F

Specific Heat Capacity

870 J/kg-K 0.21 BTU/lb-°F

Thermal Conductivity

140 W/m-K 80 BTU/h-ft-°F

Thermal Expansion

23 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

33 % IACS

Electrical Conductivity: Equal Weight (Specific)

99 % IACS

Otherwise Unclassified Properties

Base Metal Price

10 % relative

Density

3.0 g/cm3 190 lb/ft3

Embodied Carbon

8.2 kg CO2/kg material

Embodied Energy

150 MJ/kg 63 x 103 BTU/lb

Embodied Water

1130 L/kg 130 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

18 to 29 MJ/m3

Resilience: Unit (Modulus of Resilience)

1310 to 1730 kJ/m3

Stiffness to Weight: Axial

13 points

Stiffness to Weight: Bending

46 points

Strength to Weight: Axial

48 to 52 points

Strength to Weight: Bending

48 to 51 points

Thermal Diffusivity

53 m2/s

Thermal Shock Resistance

23 to 25 points

Alloy Composition

Among wrought aluminum alloys, the composition of 7175 aluminum is notable for containing comparatively high amounts of zinc (Zn) and copper (Cu). Zinc is used to achieve significant increases in strength, at the cost of increased susceptibility to stress corrosion cracking. Among other things, this limits weldability. Copper is used to improve strength. This comes at the cost of a decrease in corrosion resistance and weldability.

Aluminum (Al) 88 to 91.4
Zinc (Zn) 5.1 to 6.1
Magnesium (Mg) 2.1 to 2.9
Copper (Cu) 1.2 to 2.0
Chromium (Cr) 0.18 to 0.28
Iron (Fe) 0 to 0.2
Silicon (Si) 0 to 0.15
Manganese (Mn) 0 to 0.1
Titanium (Ti) 0 to 0.1
Residuals 0 to 0.15

All values are % weight. Ranges represent what is permitted under applicable standards.

Followup Questions

Similar Alloys

Further Reading

ASTM B247: Standard Specification for Aluminum and Aluminum-Alloy Die Forgings, Hand Forgings, and Rolled Ring Forgings

Aluminum Standards and Data, Aluminum Association Inc., 2013

ASM Specialty Handbook: Aluminum and Aluminum Alloys, J. R. Davis (editor), 1993

EN 573-3: Aluminium and aluminium alloys. Chemical composition and form of wrought products. Chemical composition and form of products

CRC Materials Science and Engineering Handbook, 4th ed., James F. Shackelford et al. (editors), 2015