EV31A Magnesium vs. R30155 Cobalt
EV31A magnesium belongs to the magnesium alloys classification, while R30155 cobalt belongs to the iron alloys. There are 23 material properties with values for both materials. Properties with values for just one material (13, in this case) are not shown. Please note that the two materials have significantly dissimilar densities. This means that additional care is required when interpreting the data, because some material properties are based on units of mass, while others are based on units of area or volume.
For each property being compared, the top bar is EV31A magnesium and the bottom bar is R30155 cobalt.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 70 | |
| 220 |
| Elastic (Young's, Tensile) Modulus, GPa | 44 | |
| 210 |
| Elongation at Break, % | 3.5 | |
| 34 |
| Fatigue Strength, MPa | 120 | |
| 310 |
| Poisson's Ratio | 0.27 | |
| 0.29 |
| Shear Modulus, GPa | 17 | |
| 81 |
| Shear Strength, MPa | 170 | |
| 570 |
| Tensile Strength: Ultimate (UTS), MPa | 260 | |
| 850 |
| Tensile Strength: Yield (Proof), MPa | 170 | |
| 390 |
Thermal Properties
| Maximum Temperature: Mechanical, °C | 200 | |
| 1100 |
| Melting Onset (Solidus), °C | 590 | |
| 1420 |
| Specific Heat Capacity, J/kg-K | 1000 | |
| 450 |
| Thermal Conductivity, W/m-K | 86 | |
| 12 |
| Thermal Expansion, µm/m-K | 27 | |
| 14 |
Otherwise Unclassified Properties
| Density, g/cm3 | 1.8 | |
| 8.5 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 8.1 | |
| 230 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 330 | |
| 370 |
| Stiffness to Weight: Axial, points | 13 | |
| 14 |
| Stiffness to Weight: Bending, points | 65 | |
| 23 |
| Strength to Weight: Axial, points | 40 | |
| 28 |
| Strength to Weight: Bending, points | 50 | |
| 24 |
| Thermal Diffusivity, mm2/s | 47 | |
| 3.2 |
| Thermal Shock Resistance, points | 16 | |
| 21 |