Aluminum 7075-O

Aluminum 7075-O

Subcategory: 7000 Series Aluminum Alloy; Aluminum Alloy; Metal; Nonferrous Metal

Close Analogs:

Composition Notes:
A Zr + Ti limit of 0.25 percent maximum may be used with this alloy designation for extruded and forged products only, but only when the supplier or producer and the purchaser have mutually so agreed. Agreement may be indicated, for example, by reference to a standard, by letter, by order note, or other means which allow the Zr + Ti limit.
Aluminum content reported is calculated as remainder.
Composition information provided by the Aluminum Association and is not for design.

Key Words: UNS A97075; ISO AlZn5.5MgCu(A); Aluminium 7075-O; AA7075-O

Component    Wt. %
Al 87.1 – 91.4
Cr 0.18 – 0.28
Cu 1.2 – 2
Fe Max 0.5
Component    Wt. %
Mg 2.1 – 2.9
Mn Max 0.3
Other, each Max 0.05
Other, total Max 0.15
Component    Wt. %
Si Max 0.4
Ti Max 0.2
Zn 5.1 – 6.1

Material Notes: 
General 7075 characteristics and uses (from Alcoa): Very high strength material used for highly stressed structural parts. The T7351 temper offers improved stress-corrosion cracking resistance.

Uses: Aircraft fittings, gears and shafts, fuse parts, meter shafts and gears, missile parts, regulating valve parts, worm gears, keys, aircraft, aerospace and defense applications.

Data points with the AA note have been provided by the Aluminum Association, Inc. and are NOT FOR DESIGN.

Physical Properties

Physical Properties Metric English Comments
Density 2.81 g/cc 0.102 lb/in³  AA; Typical

Mechanical Properties

Hardness, Brinell 60 60  AA; Typical; 500 g load; 10 mm ball
Hardness, Knoop 80 80  Converted from Brinell Hardness Value
Hardness, Vickers 68 68  Converted from Brinell Hardness Value
Ultimate Tensile Strength 228 MPa 33000 psi  AA; Typical
Tensile Yield Strength 103 MPa 15000 psi  AA; Typical
Elongation at Break 16 % 16 %  AA; Typical; 1/2 in. (12.7 mm) Diameter
Elongation at Break 17 % 17 %  AA; Typical; 1/16 in. (1.6 mm) Thickness
Modulus of Elasticity 71.7 GPa 10400 ksi  AA; Typical; Average of tension and compression. Compression modulus is about 2% greater than tensile modulus.
Poisson’s Ratio 0.33 0.33
Shear Modulus 26.9 GPa 3900 ksi
Shear Strength 152 MPa 22000 psi  AA; Typical

Electrical Properties

Electrical Resistivity 3.8e-006 ohm-cm 3.8e-006 ohm-cm

Thermal Properties

CTE, linear 68°F 23.6 µm/m-°C 13.1 µin/in-°F  AA; Typical; Average over 68-212°F range.
CTE, linear 250°C 25.2 µm/m-°C 14 µin/in-°F  Average over the range 20-300ºC
Specific Heat Capacity 0.96 J/g-°C 0.229 BTU/lb-°F
Thermal Conductivity 173 W/m-K 1200 BTU-in/hr-ft²-°F
Melting Point 477 – 635 °C 890 – 1175 °F  AA; Typical range based on typical composition for wrought products 1/4 inch thickness or greater. Homogenization may raise eutectic melting temperature 20-40°F but usually does not eliminate eutectic melting.
Solidus 477 °C 890 °F  AA; Typical
Liquidus 635 °C 1175 °F  AA; Typical

Processing Properties

Annealing Temperature 413 °C 775 °F
Solution Temperature 466 – 482 °C 870 – 900 °F