7178 Aluminum vs. EV31A Magnesium
7178 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 7178 aluminum and the bottom bar is EV31A magnesium.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 71 | |
| 44 |
| Elongation at Break, % | 4.5 to 12 | |
| 3.5 |
| Fatigue Strength, MPa | 120 to 210 | |
| 120 |
| Poisson's Ratio | 0.32 | |
| 0.27 |
| Shear Modulus, GPa | 27 | |
| 17 |
| Shear Strength, MPa | 140 to 380 | |
| 170 |
| Tensile Strength: Ultimate (UTS), MPa | 240 to 640 | |
| 260 |
| Tensile Strength: Yield (Proof), MPa | 120 to 560 | |
| 170 |
Thermal Properties
| Maximum Temperature: Mechanical, °C | 180 | |
| 200 |
| Melting Onset (Solidus), °C | 480 | |
| 590 |
| Specific Heat Capacity, J/kg-K | 860 | |
| 1000 |
| Thermal Conductivity, W/m-K | 130 | |
| 86 |
| Thermal Expansion, µm/m-K | 23 | |
| 27 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 31 | |
| 18 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 91 | |
| 90 |
Otherwise Unclassified Properties
| Density, g/cm3 | 3.1 | |
| 1.8 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 24 to 52 | |
| 8.1 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 110 to 2220 | |
| 330 |
| Stiffness to Weight: Axial, points | 13 | |
| 13 |
| Stiffness to Weight: Bending, points | 45 | |
| 65 |
| Strength to Weight: Axial, points | 21 to 58 | |
| 40 |
| Strength to Weight: Bending, points | 28 to 54 | |
| 50 |
| Thermal Diffusivity, mm2/s | 47 | |
| 47 |
| Thermal Shock Resistance, points | 10 to 28 | |
| 16 |