7021 Aluminum vs. EV31A Magnesium
7021 aluminum belongs to the aluminum alloys classification, while EV31A magnesium belongs to the magnesium alloys. There are 24 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown.
For each property being compared, the top bar is 7021 aluminum and the bottom bar is EV31A magnesium.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 69 | |
| 44 |
| Elongation at Break, % | 9.4 | |
| 3.5 |
| Fatigue Strength, MPa | 150 | |
| 120 |
| Poisson's Ratio | 0.32 | |
| 0.27 |
| Shear Modulus, GPa | 26 | |
| 17 |
| Shear Strength, MPa | 270 | |
| 170 |
| Tensile Strength: Ultimate (UTS), MPa | 460 | |
| 260 |
| Tensile Strength: Yield (Proof), MPa | 390 | |
| 170 |
Thermal Properties
| Maximum Temperature: Mechanical, °C | 200 | |
| 200 |
| Melting Onset (Solidus), °C | 510 | |
| 590 |
| Specific Heat Capacity, J/kg-K | 870 | |
| 1000 |
| Thermal Conductivity, W/m-K | 150 | |
| 86 |
| Thermal Expansion, µm/m-K | 24 | |
| 27 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 38 | |
| 18 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 120 | |
| 90 |
Otherwise Unclassified Properties
| Density, g/cm3 | 2.9 | |
| 1.8 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 41 | |
| 8.1 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 1110 | |
| 330 |
| Stiffness to Weight: Axial, points | 13 | |
| 13 |
| Stiffness to Weight: Bending, points | 47 | |
| 65 |
| Strength to Weight: Axial, points | 44 | |
| 40 |
| Strength to Weight: Bending, points | 45 | |
| 50 |
| Thermal Diffusivity, mm2/s | 59 | |
| 47 |
| Thermal Shock Resistance, points | 20 | |
| 16 |