7475-T61 Aluminum
7475-T61 aluminum is 7475 aluminum in the T61 temper. To achieve this temper, the metal is solution heat-treated and artificially underaged. The degree of underaging is different from T64 and T65. The graph bars on the material properties cards below compare 7475-T61 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
11 %
Fatigue Strength
200 MPa 29 x 103 psi
Poisson's Ratio
0.32
Shear Modulus
26 GPa 3.8 x 106 psi
Shear Strength
340 MPa 49 x 103 psi
Tensile Strength: Ultimate (UTS)
570 MPa 82 x 103 psi
Tensile Strength: Yield (Proof)
490 MPa 71 x 103 psi
Thermal Properties
Latent Heat of Fusion
380 J/g
Maximum Temperature: Mechanical
180 °C 350 °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
140 W/m-K 80 BTU/h-ft-°F
Thermal Expansion
23 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
34 % IACS
Electrical Conductivity: Equal Weight (Specific)
100 % IACS
Otherwise Unclassified Properties
Base Metal Price
10 % relative
Density
3.0 g/cm3 190 lb/ft3
Embodied Carbon
8.2 kg CO2/kg material
Embodied Energy
150 MJ/kg 63 x 103 BTU/lb
Embodied Water
1130 L/kg 130 gal/lb
Common Calculations
Resilience: Ultimate (Unit Rupture Work)
59 MJ/m3
Resilience: Unit (Modulus of Resilience)
1720 kJ/m3
Stiffness to Weight: Axial
13 points
Stiffness to Weight: Bending
46 points
Strength to Weight: Axial
52 points
Strength to Weight: Bending
51 points
Thermal Diffusivity
53 mm2/s
Thermal Shock Resistance
25 points
Alloy Composition
| Al | 88.6 to 91.6 | |
| Zn | 5.1 to 6.2 | |
| Mg | 1.9 to 2.6 | |
| Cu | 1.2 to 1.9 | |
| Cr | 0.18 to 0.25 | |
| Fe | 0 to 0.12 | |
| Si | 0 to 0.1 | |
| Mn | 0 to 0.060 | |
| Ti | 0 to 0.060 | |
| res. | 0 to 0.15 |
All values are % weight. Ranges represent what is permitted under applicable standards.
Followup Questions
Further Reading
Aluminum Standards and Data, Aluminum Association Inc., 2013
ASM Specialty Handbook: Aluminum and Aluminum Alloys, J. R. Davis (editor), 1993
EN 573-3: Aluminium and aluminium alloys. Chemical composition and form of wrought products. Chemical composition and form of products