7021 Aluminum vs. 7475 Aluminum
Both 7021 aluminum and 7475 aluminum are aluminum alloys. They have a very high 97% of their average alloy composition in common.
For each property being compared, the top bar is 7021 aluminum and the bottom bar is 7475 aluminum.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 69 | |
| 70 |
| Elongation at Break, % | 9.4 | |
| 10 to 12 |
| Fatigue Strength, MPa | 150 | |
| 190 to 210 |
| Poisson's Ratio | 0.32 | |
| 0.32 |
| Shear Modulus, GPa | 26 | |
| 26 |
| Shear Strength, MPa | 270 | |
| 320 to 350 |
| Tensile Strength: Ultimate (UTS), MPa | 460 | |
| 530 to 590 |
| Tensile Strength: Yield (Proof), MPa | 390 | |
| 440 to 520 |
Thermal Properties
| Latent Heat of Fusion, J/g | 380 | |
| 380 |
| Maximum Temperature: Mechanical, °C | 200 | |
| 180 |
| Melting Completion (Liquidus), °C | 630 | |
| 640 |
| Melting Onset (Solidus), °C | 510 | |
| 480 |
| Specific Heat Capacity, J/kg-K | 870 | |
| 870 |
| Thermal Conductivity, W/m-K | 150 | |
| 140 to 160 |
| Thermal Expansion, µm/m-K | 24 | |
| 23 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 38 | |
| 33 to 42 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 120 | |
| 98 to 120 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 9.5 | |
| 10 |
| Density, g/cm3 | 2.9 | |
| 3.0 |
| Embodied Carbon, kg CO2/kg material | 8.3 | |
| 8.2 |
| Embodied Energy, MJ/kg | 150 | |
| 150 |
| Embodied Water, L/kg | 1140 | |
| 1130 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 41 | |
| 53 to 68 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 1110 | |
| 1390 to 1920 |
| Stiffness to Weight: Axial, points | 13 | |
| 13 |
| Stiffness to Weight: Bending, points | 47 | |
| 46 |
| Strength to Weight: Axial, points | 44 | |
| 49 to 55 |
| Strength to Weight: Bending, points | 45 | |
| 48 to 52 |
| Thermal Diffusivity, mm2/s | 59 | |
| 53 to 63 |
| Thermal Shock Resistance, points | 20 | |
| 23 to 26 |
Alloy Composition
| Aluminum (Al), % | 90.7 to 93.7 | |
| 88.6 to 91.6 |
| Chromium (Cr), % | 0 to 0.050 | |
| 0.18 to 0.25 |
| Copper (Cu), % | 0 to 0.25 | |
| 1.2 to 1.9 |
| Iron (Fe), % | 0 to 0.4 | |
| 0 to 0.12 |
| Magnesium (Mg), % | 1.2 to 1.8 | |
| 1.9 to 2.6 |
| Manganese (Mn), % | 0 to 0.1 | |
| 0 to 0.060 |
| Silicon (Si), % | 0 to 0.25 | |
| 0 to 0.1 |
| Titanium (Ti), % | 0 to 0.1 | |
| 0 to 0.060 |
| Zinc (Zn), % | 5.0 to 6.0 | |
| 5.1 to 6.2 |
| Zirconium (Zr), % | 0.080 to 0.18 | |
| 0 |
| Residuals, % | 0 | |
| 0 to 0.15 |