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EV31A Magnesium vs. R30035 Cobalt

EV31A magnesium belongs to the magnesium alloys classification, while R30035 cobalt belongs to the cobalt alloys. There are 22 material properties with values for both materials. Properties with values for just one material (12, 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 R30035 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 44
220 to 230
Elongation at Break, % 3.5
9.0 to 46
Fatigue Strength, MPa 120
170 to 740
Poisson's Ratio 0.27
0.29
Shear Modulus, GPa 17
84 to 89
Tensile Strength: Ultimate (UTS), MPa 260
900 to 1900
Tensile Strength: Yield (Proof), MPa 170
300 to 1650

Thermal Properties

Melting Onset (Solidus), °C 590
1320
Specific Heat Capacity, J/kg-K 1000
440
Thermal Conductivity, W/m-K 86
11
Thermal Expansion, µm/m-K 27
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 18
1.7
Electrical Conductivity: Equal Weight (Specific), % IACS 90
1.8

Otherwise Unclassified Properties

Density, g/cm3 1.8
8.7

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 8.1
160 to 320
Resilience: Unit (Modulus of Resilience), kJ/m3 330
210 to 5920
Stiffness to Weight: Axial, points 13
14 to 15
Stiffness to Weight: Bending, points 65
23 to 24
Strength to Weight: Axial, points 40
29 to 61
Strength to Weight: Bending, points 50
24 to 39
Thermal Diffusivity, mm2/s 47
3.0
Thermal Shock Resistance, points 16
23 to 46