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EN-MC21230 Magnesium vs. R30021 Cobalt

EN-MC21230 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-MC21230 magnesium and the bottom bar is R30021 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 45
220
Elongation at Break, % 10
9.0
Fatigue Strength, MPa 99
250
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 18
86
Tensile Strength: Ultimate (UTS), MPa 220
700
Tensile Strength: Yield (Proof), MPa 140
500

Thermal Properties

Latent Heat of Fusion, J/g 350
330
Melting Completion (Liquidus), °C 600
1350
Melting Onset (Solidus), °C 520
1190
Specific Heat Capacity, J/kg-K 1000
450
Thermal Conductivity, W/m-K 72
15
Thermal Expansion, µm/m-K 27
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 12
1.9
Electrical Conductivity: Equal Weight (Specific), % IACS 63
2.1

Otherwise Unclassified Properties

Density, g/cm3 1.7
8.4
Embodied Carbon, kg CO2/kg material 23
8.0
Embodied Energy, MJ/kg 160
110
Embodied Water, L/kg 990
520

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 19
57
Resilience: Unit (Modulus of Resilience), kJ/m3 200
570
Stiffness to Weight: Axial, points 15
15
Stiffness to Weight: Bending, points 71
24
Strength to Weight: Axial, points 36
23
Strength to Weight: Bending, points 48
21
Thermal Diffusivity, mm2/s 43
3.8
Thermal Shock Resistance, points 13
21

Alloy Composition


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Aluminum (Al), % 5.5 to 8.5
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 0.010
0
Iron (Fe), % 0 to 0.0050
0 to 3.0
Magnesium (Mg), % 90.5 to 94.4
0
Manganese (Mn), % 0.1 to 0.6
0
Molybdenum (Mo), % 0
4.5 to 6.0
Nickel (Ni), % 0 to 0.0020
2.0 to 3.0
Silicon (Si), % 0 to 0.1
0 to 1.5
Zinc (Zn), % 0 to 0.3
0
Residuals, % 0 to 0.010
0