7178-T76 Aluminum
7178-T76 aluminum is 7178 aluminum in the T76 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 exfoliation corrosion resistance.
The graph bars on the material properties cards below compare 7178-T76 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
71 GPa 10 x 106 psi
Elongation at Break
8.2 %
Fatigue Strength
200 MPa 29 x 103 psi
Poisson's Ratio
0.32
Shear Modulus
27 GPa 3.9 x 106 psi
Shear Strength
340 MPa 49 x 103 psi
Tensile Strength: Ultimate (UTS)
580 MPa 84 x 103 psi
Tensile Strength: Yield (Proof)
510 MPa 74 x 103 psi
Thermal Properties
Latent Heat of Fusion
370 J/g
Maximum Temperature: Mechanical
180 °C 350 °F
Melting Completion (Liquidus)
630 °C 1170 °F
Melting Onset (Solidus)
480 °C 890 °F
Specific Heat Capacity
860 J/kg-K 0.2 BTU/lb-°F
Thermal Conductivity
130 W/m-K 72 BTU/h-ft-°F
Thermal Expansion
23 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
31 % IACS
Electrical Conductivity: Equal Weight (Specific)
91 % IACS
Otherwise Unclassified Properties
Base Metal Price
10 % relative
Density
3.1 g/cm3 190 lb/ft3
Embodied Carbon
8.2 kg CO2/kg material
Embodied Energy
150 MJ/kg 62 x 103 BTU/lb
Embodied Water
1110 L/kg 130 gal/lb
Common Calculations
Resilience: Ultimate (Unit Rupture Work)
46 MJ/m3
Resilience: Unit (Modulus of Resilience)
1830 kJ/m3
Stiffness to Weight: Axial
13 points
Stiffness to Weight: Bending
45 points
Strength to Weight: Axial
52 points
Strength to Weight: Bending
50 points
Thermal Diffusivity
47 mm2/s
Thermal Shock Resistance
25 points
Alloy Composition
| Al | 85.4 to 89.5 | |
| Zn | 6.3 to 7.3 | |
| Mg | 2.4 to 3.1 | |
| Cu | 1.6 to 2.4 | |
| Fe | 0 to 0.5 | |
| Cr | 0.18 to 0.28 | |
| Si | 0 to 0.4 | |
| Mn | 0 to 0.3 | |
| 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
ASTM B221: Standard Specification for Aluminum and Aluminum-Alloy Extruded Bars, Rods, Wire, Profiles, and Tubes
Handbook of Aluminum vol. 2: Alloy Production and Materials Manufacturing, George Totten and D. Scott MacKenzie (editors), 2003
ASTM B209: Standard Specification for Aluminum and Aluminum-Alloy Sheet and Plate
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