Aluminum 7075-T73; 7075-T735x

Aluminum 7075-T73; 7075-T735x

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: AA7075-T73; AA7075-T735, UNS A97075; ISO AlZn5.5MgCu; Aluminium 7075-T73; Aluminium 7075-T735x

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 135 135  500 kg load with 10 mm ball. Calculated value.
Hardness, Knoop 120 120  Converted from Brinell Hardness Value
Hardness, Rockwell A 50.5 50.5  Converted from Brinell Hardness Value
Hardness, Rockwell B 82 82  Converted from Brinell Hardness Value
Hardness, Vickers 155 155  Converted from Brinell Hardness Value
Tensile Strength, Ultimate 505 MPa 73200 psi
Tensile Strength, Yield 435 MPa 63100 psi
Elongation at Break 13 % 13 %  In 5 cm; Sample 1.6 mm thick
Modulus of Elasticity 72 GPa 10400 ksi  Average of Tension and Compression. In Aluminum alloys, the compressive modulus is typically 2% greater than the tensile modulus
Poisson’s Ratio 0.33 0.33
Fatigue Strength 150 MPa 21800 psi  500,000,000 Cycles
Fracture Toughness 20 MPa-m½ 18.2 ksi-in½  Plate. K(IC) in SL direction
Fracture Toughness 20 MPa-m½ 18.2 ksi-in½  Plate. K(IC) in T-L direction
Fracture Toughness 32 MPa-m½ 29.1 ksi-in½  Plate. K(IC) in L-T Direction
Machinability 70 % 70 %  0-100 Scale of Aluminum Alloys
Shear Modulus 26.9 GPa 3900 ksi
Shear Strength 300 MPa 43500 psi  Calculated value.

Electrical Properties

Electrical Resistivity 4.3e-006 ohm-cm 4.3e-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 155 W/m-K 1080 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
Aging Temperature 107 °C 225 °F  two stage treatment – second stage 325 to 350°F