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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

Aluminum (Al) 85.4 to 89.5
Zinc (Zn) 6.3 to 7.3
Magnesium (Mg) 2.4 to 3.1
Copper (Cu) 1.6 to 2.4
Iron (Fe) 0 to 0.5
Chromium (Cr) 0.18 to 0.28
Silicon (Si) 0 to 0.4
Manganese (Mn) 0 to 0.3
Titanium (Ti) 0 to 0.2
Residuals 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