7005 (AlZn4.5Mg1.5Mn, A97005) Aluminum
7005 aluminum is a 7000-series aluminum alloy: the main alloying addition is zinc and it is formulated for primary forming into wrought products. 7005 is the Aluminum Association (AA) designation for this material. In European standards, it will be given as EN AW-7005. A97005 is the UNS number. Additionally, the EN chemical designation is AlZn4,5Mg1,5Mn.
It has been in use since 1960, but has only received its standard designation in 1962.
It can have the highest ductility and the highest thermal conductivity among 7000-series alloys.
The properties of 7005 aluminum include four common variations. This page shows summary ranges across all of them. For more specific values, follow the links immediately below. The graph bars on the material properties cards further below compare 7005 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
Elastic (Young's, Tensile) Modulus
70 GPa 10 x 106 psi
Elongation at Break
10 to 20 %
Fatigue Strength
100 to 190 MPa 15 to 28 x 103 psi
Poisson's Ratio
0.33
Shear Modulus
26 GPa 3.8 x 106 psi
Shear Strength
120 to 230 MPa 17 to 34 x 103 psi
Tensile Strength: Ultimate (UTS)
200 to 400 MPa 28 to 57 x 103 psi
Tensile Strength: Yield (Proof)
95 to 350 MPa 14 to 50 x 103 psi
Thermal Properties
Latent Heat of Fusion
380 J/g
Maximum Temperature: Mechanical
200 °C 400 °F
Melting Completion (Liquidus)
640 °C 1190 °F
Melting Onset (Solidus)
610 °C 1120 °F
Specific Heat Capacity
880 J/kg-K 0.21 BTU/lb-°F
Thermal Conductivity
140 to 170 W/m-K 79 to 96 BTU/h-ft-°F
Thermal Expansion
23 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
35 to 43 % IACS
Electrical Conductivity: Equal Weight (Specific)
110 to 130 % IACS
Otherwise Unclassified Properties
Base Metal Price
9.5 % relative
Calomel Potential
-850 mV
Density
2.9 g/cm3 180 lb/ft3
Embodied Carbon
8.3 kg CO2/kg material
Embodied Energy
150 MJ/kg 65 x 103 BTU/lb
Embodied Water
1150 L/kg 140 gal/lb
Common Calculations
Resilience: Ultimate (Unit Rupture Work)
32 to 57 MJ/m3
Resilience: Unit (Modulus of Resilience)
65 to 850 kJ/m3
Stiffness to Weight: Axial
13 points
Stiffness to Weight: Bending
47 points
Strength to Weight: Axial
19 to 38 points
Strength to Weight: Bending
26 to 41 points
Thermal Diffusivity
54 to 65 mm2/s
Thermal Shock Resistance
8.7 to 18 points
Alloy Composition
Among wrought aluminum alloys, the composition of 7005 aluminum is notable for containing a comparatively high amount of zinc (Zn) and including zirconium (Zr). Zinc is used to achieve significant increases in strength, at the cost of increased susceptibility to stress corrosion cracking. Among other things, this limits weldability. Zirconium is used to increase an alloy's recrystallization temperature, which increases the temperature at which the alloy can be used without permanent loss of mechanical properties.
| Al | 91 to 94.7 | |
| Zn | 4.0 to 5.0 | |
| Mg | 1.0 to 1.8 | |
| Mn | 0.2 to 0.7 | |
| Fe | 0 to 0.4 | |
| Si | 0 to 0.35 | |
| Zr | 0.080 to 0.2 | |
| Cr | 0.060 to 0.2 | |
| Cu | 0 to 0.1 | |
| Ti | 0.010 to 0.060 | |
| res. | 0 to 0.15 |
All values are % weight. Ranges represent what is permitted under applicable standards.
Followup Questions
Similar Alloys
Further Reading
ASTM B221: Standard Specification for Aluminum and Aluminum-Alloy Extruded Bars, Rods, Wire, Profiles, and Tubes
EN 755-2: Aluminium and aluminium alloys. Extruded rod/bar, tube and profiles. Mechanical properties
Aluminum Standards and Data, Aluminum Association Inc., 2013
EN 573-3: Aluminium and aluminium alloys. Chemical composition and form of wrought products. Chemical composition and form of products
Properties and Selection: Nonferrous Alloys and Special-Purpose Materials, ASM Handbook vol. 2, ASM International, 1993