7049-T73 Aluminum
7049-T73 aluminum is 7049 aluminum in the T73 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 stress corrosion resistance.
The graph bars on the material properties cards below compare 7049-T73 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
Brinell Hardness
140
Elastic (Young's, Tensile) Modulus
70 GPa 10 x 106 psi
Elongation at Break
6.2 %
Fatigue Strength
170 MPa 24 x 103 psi
Poisson's Ratio
0.32
Shear Modulus
27 GPa 3.8 x 106 psi
Shear Strength
310 MPa 44 x 103 psi
Tensile Strength: Ultimate (UTS)
530 MPa 76 x 103 psi
Tensile Strength: Yield (Proof)
450 MPa 65 x 103 psi
Thermal Properties
Latent Heat of Fusion
370 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
860 J/kg-K 0.2 BTU/lb-°F
Thermal Conductivity
130 W/m-K 77 BTU/h-ft-°F
Thermal Expansion
23 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
36 % IACS
Electrical Conductivity: Equal Weight (Specific)
110 % IACS
Otherwise Unclassified Properties
Base Metal Price
10 % relative
Density
3.1 g/cm3 190 lb/ft3
Embodied Carbon
8.1 kg CO2/kg material
Embodied Energy
140 MJ/kg 62 x 103 BTU/lb
Embodied Water
1110 L/kg 130 gal/lb
Common Calculations
Resilience: Ultimate (Unit Rupture Work)
31 MJ/m3
Resilience: Unit (Modulus of Resilience)
1440 kJ/m3
Stiffness to Weight: Axial
13 points
Stiffness to Weight: Bending
45 points
Strength to Weight: Axial
47 points
Strength to Weight: Bending
47 points
Thermal Diffusivity
51 mm2/s
Thermal Shock Resistance
23 points
Alloy Composition
| Al | 85.7 to 89.5 | |
| Zn | 7.2 to 8.2 | |
| Mg | 2.0 to 2.9 | |
| Cu | 1.2 to 1.9 | |
| Fe | 0 to 0.35 | |
| Cr | 0.1 to 0.22 | |
| Si | 0 to 0.25 | |
| Mn | 0 to 0.2 | |
| Ti | 0 to 0.1 | |
| res. | 0 to 0.15 |
All values are % weight. Ranges represent what is permitted under applicable standards.
Followup Questions
Further Reading
ASTM B247: Standard Specification for Aluminum and Aluminum-Alloy Die Forgings, Hand Forgings, and Rolled Ring Forgings
Aluminum Standards and Data, Aluminum Association Inc., 2013
Properties and Selection: Nonferrous Alloys and Special-Purpose Materials, ASM Handbook vol. 2, ASM International, 1993