7021 Aluminum vs. 7108A Aluminum
Both 7021 aluminum and 7108A aluminum are aluminum alloys. Their average alloy composition is basically identical.
For each property being compared, the top bar is 7021 aluminum and the bottom bar is 7108A aluminum.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 69 | |
| 69 |
| Elongation at Break, % | 9.4 | |
| 11 to 13 |
| Fatigue Strength, MPa | 150 | |
| 120 to 130 |
| Poisson's Ratio | 0.32 | |
| 0.33 |
| Shear Modulus, GPa | 26 | |
| 26 |
| Shear Strength, MPa | 270 | |
| 210 |
| Tensile Strength: Ultimate (UTS), MPa | 460 | |
| 350 |
| Tensile Strength: Yield (Proof), MPa | 390 | |
| 290 to 300 |
Thermal Properties
| Latent Heat of Fusion, J/g | 380 | |
| 380 |
| Maximum Temperature: Mechanical, °C | 200 | |
| 210 |
| Melting Completion (Liquidus), °C | 630 | |
| 630 |
| Melting Onset (Solidus), °C | 510 | |
| 520 |
| Specific Heat Capacity, J/kg-K | 870 | |
| 870 |
| Thermal Conductivity, W/m-K | 150 | |
| 150 |
| Thermal Expansion, µm/m-K | 24 | |
| 24 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 38 | |
| 36 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 120 | |
| 110 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 9.5 | |
| 10 |
| Density, g/cm3 | 2.9 | |
| 2.9 |
| Embodied Carbon, kg CO2/kg material | 8.3 | |
| 8.3 |
| Embodied Energy, MJ/kg | 150 | |
| 150 |
| Embodied Water, L/kg | 1140 | |
| 1150 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 41 | |
| 38 to 44 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 1110 | |
| 610 to 640 |
| Stiffness to Weight: Axial, points | 13 | |
| 13 |
| Stiffness to Weight: Bending, points | 47 | |
| 47 |
| Strength to Weight: Axial, points | 44 | |
| 33 to 34 |
| Strength to Weight: Bending, points | 45 | |
| 38 |
| Thermal Diffusivity, mm2/s | 59 | |
| 59 |
| Thermal Shock Resistance, points | 20 | |
| 15 to 16 |
Alloy Composition
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| Aluminum (Al), % | 90.7 to 93.7 | |
| 91.6 to 94.4 |
| Chromium (Cr), % | 0 to 0.050 | |
| 0 to 0.040 |
| Copper (Cu), % | 0 to 0.25 | |
| 0 to 0.050 |
| Gallium (Ga), % | 0 | |
| 0 to 0.030 |
| Iron (Fe), % | 0 to 0.4 | |
| 0 to 0.3 |
| Magnesium (Mg), % | 1.2 to 1.8 | |
| 0.7 to 1.5 |
| Manganese (Mn), % | 0 to 0.1 | |
| 0 to 0.050 |
| Silicon (Si), % | 0 to 0.25 | |
| 0 to 0.2 |
| Titanium (Ti), % | 0 to 0.1 | |
| 0 to 0.030 |
| Zinc (Zn), % | 5.0 to 6.0 | |
| 4.8 to 5.8 |
| Zirconium (Zr), % | 0.080 to 0.18 | |
| 0.15 to 0.25 |
| Residuals, % | 0 to 0.15 | |
| 0 to 0.15 |