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EN-MC21120 Magnesium vs. R30021 Cobalt

EN-MC21120 magnesium belongs to the magnesium alloys classification, while R30021 cobalt belongs to the cobalt alloys. There are 27 material properties with values for both materials. Properties with values for just one material (6, 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 EN-MC21120 magnesium and the bottom bar is R30021 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 46
220
Elongation at Break, % 2.2 to 6.7
9.0
Fatigue Strength, MPa 84 to 96
250
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 18
86
Tensile Strength: Ultimate (UTS), MPa 200 to 270
700
Tensile Strength: Yield (Proof), MPa 130 to 170
500

Thermal Properties

Latent Heat of Fusion, J/g 350
330
Melting Completion (Liquidus), °C 600
1350
Melting Onset (Solidus), °C 490
1190
Specific Heat Capacity, J/kg-K 990
450
Thermal Conductivity, W/m-K 76
15
Thermal Expansion, µm/m-K 26
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 11
1.9
Electrical Conductivity: Equal Weight (Specific), % IACS 59
2.1

Otherwise Unclassified Properties

Density, g/cm3 1.7
8.4
Embodied Carbon, kg CO2/kg material 22
8.0
Embodied Energy, MJ/kg 160
110
Embodied Water, L/kg 990
520

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 5.0 to 15
57
Resilience: Unit (Modulus of Resilience), kJ/m3 180 to 320
570
Stiffness to Weight: Axial, points 15
15
Stiffness to Weight: Bending, points 69
24
Strength to Weight: Axial, points 31 to 43
23
Strength to Weight: Bending, points 43 to 53
21
Thermal Diffusivity, mm2/s 44
3.8
Thermal Shock Resistance, points 11 to 16
21

Alloy Composition


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Aluminum (Al), % 8.3 to 9.7
0
Carbon (C), % 0
0.2 to 0.35
Chromium (Cr), % 0
26 to 29
Cobalt (Co), % 0
61.7 to 67.3
Copper (Cu), % 0 to 0.030
0
Iron (Fe), % 0 to 0.0050
0 to 3.0
Magnesium (Mg), % 88.6 to 91.3
0
Manganese (Mn), % 0.1 to 0.5
0
Molybdenum (Mo), % 0
4.5 to 6.0
Nickel (Ni), % 0 to 0.0020
2.0 to 3.0
Silicon (Si), % 0 to 0.2
0 to 1.5
Zinc (Zn), % 0.35 to 1.0
0
Residuals, % 0 to 0.010
0