7075-T73 Aluminum
7075-T73 aluminum is 7075 aluminum in the T73 temper. To achieve this temper, the metal is solution heat-treated and stabilized by artificial overaging. The degree of overaging is chosen so as to maximize stress corrosion resistance.
The graph bars on the material properties cards below compare 7075-T73 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
Brinell Hardness
140
Elastic (Young's, Tensile) Modulus
70 GPa 10 x 106 psi
Elongation at Break
7.1 %
Fatigue Strength
160 MPa 23 x 103 psi
Poisson's Ratio
0.32
Shear Modulus
26 GPa 3.8 x 106 psi
Shear Strength
290 MPa 42 x 103 psi
Tensile Strength: Ultimate (UTS)
500 MPa 72 x 103 psi
Tensile Strength: Yield (Proof)
410 MPa 60 x 103 psi
Thermal Properties
Latent Heat of Fusion
380 J/g
Maximum Temperature: Mechanical
200 °C 400 °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
130 W/m-K 75 BTU/h-ft-°F
Thermal Expansion
23 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
33 % IACS
Electrical Conductivity: Equal Weight (Specific)
98 % IACS
Otherwise Unclassified Properties
Base Metal Price
10 % relative
Calomel Potential
-750 mV
Density
3.0 g/cm3 190 lb/ft3
Embodied Carbon
8.3 kg CO2/kg material
Embodied Energy
150 MJ/kg 64 x 103 BTU/lb
Embodied Water
1120 L/kg 130 gal/lb
Common Calculations
Resilience: Ultimate (Unit Rupture Work)
33 MJ/m3
Resilience: Unit (Modulus of Resilience)
1230 kJ/m3
Stiffness to Weight: Axial
13 points
Stiffness to Weight: Bending
46 points
Strength to Weight: Axial
46 points
Strength to Weight: Bending
46 points
Thermal Diffusivity
50 mm2/s
Thermal Shock Resistance
22 points
Alloy Composition
| Al | 86.9 to 91.4 | |
| Zn | 5.1 to 6.1 | |
| Mg | 2.1 to 2.9 | |
| Cu | 1.2 to 2.0 | |
| Fe | 0 to 0.5 | |
| Cr | 0.18 to 0.28 | |
| Si | 0 to 0.4 | |
| Mn | 0 to 0.3 | |
| Zr | 0 to 0.25 | |
| Ti | 0 to 0.2 | |
| res. | 0 to 0.15 |
All values are % weight. Ranges represent what is permitted under applicable standards.
Followup Questions
Further Reading
EN 586-2: Aluminium and aluminium alloys. Forgings. Mechanical properties and additional property requirements.
ASTM B247: Standard Specification for Aluminum and Aluminum-Alloy Die Forgings, Hand Forgings, and Rolled Ring Forgings
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
EN 754-2: Aluminium and aluminium alloys. Cold drawn rod/bar and tube. Mechanical properties
ASTM B209: Standard Specification for Aluminum and Aluminum-Alloy Sheet and Plate
Pressure Vessels: External Pressure Technology, 2nd ed., Carl T. F. Ross, 2011
EN 755-2: Aluminium and aluminium alloys. Extruded rod/bar, tube and profiles. Mechanical properties
EN 485-2: Aluminium and aluminium alloys. Sheet, strip and plate. Mechanical properties