7075 (AlZn5.5MgCu, 3.4365, 2L95, A97075) Aluminum

7075 aluminum is an alloy of aluminum, further classified within the AA 7000 series (aluminum-zinc wrought alloy). 7075 is the Aluminum Association (AA) designation for this material. In European standards, it will typically be given as EN AW-7075. A97075 is the UNS number. 2L95 is the British Standard (BS) designation. Additionally, the EN chemical designation is AlZn5,5MgCu.

It has 17 common variants, each represented as a separate material.

Material Properties

Base Metal Price17 % rel

Calomel Potential-750 mV

Density3.1 g/cm3 (190 lb/ft3)

Elastic (Young's, Tensile) Modulus72 GPa (10 x 106 psi)

Electrical Conductivity33 % IACS

Electrical Resistivity Order of Magnitude-7 10x Ω-m

Elongation at Break1.7 to 12 %

Melting Onset (Solidus)480 °C (900 °F)

Poisson's Ratio0.32

Shear Modulus27 GPa (3.9 x 106 psi)

Specific Heat Capacity910 J/kg-K

Strength to Weight Ratio74 to 190 kN-m/kg

Tensile Strength: Ultimate (UTS)230 to 590 MPa (33 to 86 x 103 psi)

Tensile Strength: Yield (Proof)130 to 520 MPa (19 to 75 x 103 psi)

Thermal Conductivity130 W/m-K

Thermal Diffusivity46

Thermal Expansion23 µm/m-K

Alloy Composition

Aluminum (Al)86.9 to 91.4 %

Zinc (Zn)5.1 to 6.1 %

Magnesium (Mg)2.1 to 2.9 %

Copper (Cu)1.2 to 2.0 %

Iron (Fe)0 to 0.5 %

Chromium (Cr)0.18 to 0.28 %

Silicon (Si)0 to 0.4 %

Manganese (Mn)0 to 0.3 %

Zirconium (Zr)0 to 0.25 %

Titanium (Ti)0 to 0.2 %

Residuals0 to 0.15 %

Further Reading

Aluminum Standards and Data, Aluminum Association Inc., 2013

ASTM B209: Standard Specification for Aluminum and Aluminum-Alloy Sheet and Plate

ASTM B210: Standard Specification for Aluminum and Aluminum-Alloy Drawn Seamless Tubes

ASTM B211: Standard Specification for Aluminum and Aluminum-Alloy Bar, Rod, and Wire

ASTM B221: Standard Specification for Aluminum and Aluminum-Alloy Extruded Bars, Rods, Wire, Profiles, and Tubes

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

EN 485-2: Aluminium and aluminium alloys. Sheet, strip and plate. Mechanical properties

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

EN 586-2: Aluminium and aluminium alloys. Forgings. Mechanical properties and additional property requirements.

EN 754-2: Aluminium and aluminium alloys. Cold drawn rod/bar and tube. Mechanical properties

EN 755-2: Aluminium and aluminium alloys. Extruded rod/bar, tube and profiles. Mechanical properties

ISO 6361: Wrought Aluminium and Aluminium Alloy Sheets, Strips and Plates