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EV31A Magnesium vs. R30021 Cobalt

EV31A magnesium belongs to the magnesium alloys classification, while R30021 cobalt belongs to the cobalt alloys. There are 23 material properties with values for both materials. Properties with values for just one material (10, 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 R30021 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Compressive (Crushing) Strength, MPa 360
1300
Elastic (Young's, Tensile) Modulus, GPa 44
220
Elongation at Break, % 3.5
9.0
Fatigue Strength, MPa 120
250
Poisson's Ratio 0.27
0.29
Shear Modulus, GPa 17
86
Tensile Strength: Ultimate (UTS), MPa 260
700
Tensile Strength: Yield (Proof), MPa 170
500

Thermal Properties

Melting Onset (Solidus), °C 590
1190
Specific Heat Capacity, J/kg-K 1000
450
Thermal Conductivity, W/m-K 86
15
Thermal Expansion, µm/m-K 27
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 18
1.9
Electrical Conductivity: Equal Weight (Specific), % IACS 90
2.1

Otherwise Unclassified Properties

Density, g/cm3 1.8
8.4

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 8.1
57
Resilience: Unit (Modulus of Resilience), kJ/m3 330
570
Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 65
24
Strength to Weight: Axial, points 40
23
Strength to Weight: Bending, points 50
21
Thermal Diffusivity, mm2/s 47
3.8
Thermal Shock Resistance, points 16
21