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. %
Al87.1 - 91.4 
Cr0.18 - 0.28 
Cu1.2 - 2 
FeMax 0.5 
Component   Wt. %
Mg2.1 - 2.9 
MnMax 0.3 
Other, eachMax 0.05 
Other, totalMax 0.15 
Component   Wt. %
SiMax 0.4 
TiMax 0.2 
Zn5.1 - 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 PropertiesMetricEnglishComments
Density2.81 g/cc0.102 lb/in AA; Typical

Mechanical Properties
Hardness, Brinell135135 500 kg load with 10 mm ball. Calculated value.
Hardness, Knoop120120 Converted from Brinell Hardness Value
Hardness, Rockwell A50.550.5 Converted from Brinell Hardness Value
Hardness, Rockwell B8282 Converted from Brinell Hardness Value
Hardness, Vickers155155 Converted from Brinell Hardness Value
Tensile Strength, Ultimate505 MPa73200 psi 
Tensile Strength, Yield435 MPa63100 psi 
Elongation at Break13 %13 % In 5 cm; Sample 1.6 mm thick
Modulus of Elasticity72 GPa10400 ksi Average of Tension and Compression. In Aluminum alloys, the compressive modulus is typically 2% greater than the tensile modulus
Poisson's Ratio0.330.33 
Fatigue Strength150 MPa21800 psi 500,000,000 Cycles
Fracture Toughness20 MPa-m18.2 ksi-in Plate. K(IC) in SL direction
Fracture Toughness20 MPa-m18.2 ksi-in Plate. K(IC) in T-L direction
Fracture Toughness32 MPa-m29.1 ksi-in Plate. K(IC) in L-T Direction
Machinability70 %70 % 0-100 Scale of Aluminum Alloys
Shear Modulus26.9 GPa3900 ksi 
Shear Strength300 MPa43500 psi Calculated value.

Electrical Properties
Electrical Resistivity4.3e-006 ohm-cm4.3e-006 ohm-cm 

Thermal Properties
CTE, linear 68F23.6 m/m-C13.1 in/in-F AA; Typical; Average over 68-212F range.
CTE, linear 250C25.2 m/m-C14 in/in-F Average over the range 20-300C
Specific Heat Capacity0.96 J/g-C0.229 BTU/lb-F 
Thermal Conductivity155 W/m-K1080 BTU-in/hr-ft-F 
Melting Point477 - 635 C890 - 1175 F AA; Typical range based on typical composition for wrought products 1/4 inch thickness or greater. Homogenization may raise eutectic melting temperature 20-40F but usually does not eliminate eutectic melting.
Solidus477 C890 F AA; Typical
Liquidus635 C1175 F AA; Typical

Processing Properties
Annealing Temperature413 C775 F 
Solution Temperature466 - 482 C870 - 900 F 
Aging Temperature107 C225 F two stage treatment - second stage 325 to 350F

References for this datasheet.


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