7003 Aluminum vs. 7021 Aluminum
Both 7003 aluminum and 7021 aluminum are aluminum alloys. Their average alloy composition is basically identical.
For each property being compared, the top bar is 7003 aluminum and the bottom bar is 7021 aluminum.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 70 | |
| 69 |
| Elongation at Break, % | 11 | |
| 9.4 |
| Fatigue Strength, MPa | 130 to 150 | |
| 150 |
| Poisson's Ratio | 0.32 | |
| 0.32 |
| Shear Modulus, GPa | 26 | |
| 26 |
| Shear Strength, MPa | 210 to 230 | |
| 270 |
| Tensile Strength: Ultimate (UTS), MPa | 350 to 390 | |
| 460 |
| Tensile Strength: Yield (Proof), MPa | 300 to 310 | |
| 390 |
Thermal Properties
| Latent Heat of Fusion, J/g | 380 | |
| 380 |
| Maximum Temperature: Mechanical, °C | 200 | |
| 200 |
| Melting Completion (Liquidus), °C | 630 | |
| 630 |
| Melting Onset (Solidus), °C | 510 | |
| 510 |
| 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 | 36 | |
| 38 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 110 | |
| 120 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 9.5 | |
| 9.5 |
| Density, g/cm3 | 2.9 | |
| 2.9 |
| Embodied Carbon, kg CO2/kg material | 8.1 | |
| 8.3 |
| Embodied Energy, MJ/kg | 150 | |
| 150 |
| Embodied Water, L/kg | 1140 | |
| 1140 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 37 to 41 | |
| 41 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 630 to 710 | |
| 1110 |
| Stiffness to Weight: Axial, points | 13 | |
| 13 |
| Stiffness to Weight: Bending, points | 47 | |
| 47 |
| Strength to Weight: Axial, points | 33 to 37 | |
| 44 |
| Strength to Weight: Bending, points | 37 to 40 | |
| 45 |
| Thermal Diffusivity, mm2/s | 59 | |
| 59 |
| Thermal Shock Resistance, points | 15 to 17 | |
| 20 |
Alloy Composition
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| Aluminum (Al), % | 90.6 to 94.5 | |
| 90.7 to 93.7 |
| Chromium (Cr), % | 0 to 0.2 | |
| 0 to 0.050 |
| Copper (Cu), % | 0 to 0.2 | |
| 0 to 0.25 |
| Iron (Fe), % | 0 to 0.35 | |
| 0 to 0.4 |
| Magnesium (Mg), % | 0.5 to 1.0 | |
| 1.2 to 1.8 |
| Manganese (Mn), % | 0 to 0.3 | |
| 0 to 0.1 |
| Silicon (Si), % | 0 to 0.3 | |
| 0 to 0.25 |
| Titanium (Ti), % | 0 to 0.2 | |
| 0 to 0.1 |
| Zinc (Zn), % | 5.0 to 6.5 | |
| 5.0 to 6.0 |
| Zirconium (Zr), % | 0.050 to 0.25 | |
| 0.080 to 0.18 |
| Residuals, % | 0 to 0.15 | |
| 0 to 0.15 |