7129 (AlZn4.5Mg1.5Cu(A), A97129) Aluminum
7129 Aluminum is a 7000-series aluminum alloy: the main alloying addition is zinc and it is formulated for primary forming into wrought products. 7129 is the Aluminum Association (AA) designation for this material. In European standards, it will be given as EN AW-7129. A97129 is the UNS number. Additionally, the EN chemical designation is AlZn4,5Mg1,5Cu(A).
It originally received its standard designation in 1977.
The properties of 7129 Aluminum include two common variations. This page shows summary ranges across both of them. For more specific values, follow the links immediately below. The graph bars on the material properties cards further below compare 7129 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
69 GPa 10 x 106 psi
Elongation at Break
9.0 to 9.1 %
Fatigue Strength
150 to 190 MPa 22 to 27 x 103 psi
Poisson's Ratio
0.33
Shear Modulus
26 GPa 3.8 x 106 psi
Shear Strength
250 to 260 MPa 37 x 103 psi
Tensile Strength: Ultimate (UTS)
430 MPa 62 to 63 x 103 psi
Tensile Strength: Yield (Proof)
380 to 390 MPa 55 to 56 x 103 psi
Thermal Properties
Latent Heat of Fusion
380 J/g
Maximum Temperature: Mechanical
180 °C 350 °F
Melting Completion (Liquidus)
630 °C 1170 °F
Melting Onset (Solidus)
510 °C 960 °F
Specific Heat Capacity
880 J/kg-K 0.21 BTU/lb-°F
Thermal Conductivity
150 W/m-K 86 BTU/h-ft-°F
Thermal Expansion
24 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
40 % IACS
Electrical Conductivity: Equal Weight (Specific)
120 % IACS
Otherwise Unclassified Properties
Base Metal Price
9.5 % relative
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)
37 to 38 MJ/m3
Resilience: Unit (Modulus of Resilience)
1050 to 1090 kJ/m3
Stiffness to Weight: Axial
13 points
Stiffness to Weight: Bending
47 points
Strength to Weight: Axial
41 points
Strength to Weight: Bending
43 to 44 points
Thermal Diffusivity
58 mm2/s
Thermal Shock Resistance
19 points
Alloy Composition
Among wrought aluminum alloys, the composition of 7129 Aluminum is notable for including gallium (Ga) and vanadium (V). Gallium is used to improve corrosion resistance and to modify an alloy's response to etching, brightening, and similar treatments. Vanadium is used to reduce grain size and increase recrystallization temperature.
| Al | 91 to 94 | |
| Zn | 4.2 to 5.2 | |
| Mg | 1.3 to 2.0 | |
| Cu | 0.5 to 0.9 | |
| Fe | 0 to 0.3 | |
| Si | 0 to 0.15 | |
| Mn | 0 to 0.1 | |
| Cr | 0 to 0.1 | |
| Ti | 0 to 0.050 | |
| V | 0 to 0.050 | |
| Ga | 0 to 0.030 | |
| 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
Advanced Materials in Automotive Engineering, Jason Rowe (editor), 2012
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