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ISO-WD43150 Magnesium vs. R30021 Cobalt

ISO-WD43150 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 (5, 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 ISO-WD43150 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, % 2.8
9.0
Fatigue Strength, MPa 100
250
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 18
86
Tensile Strength: Ultimate (UTS), MPa 250
700
Tensile Strength: Yield (Proof), MPa 150
500

Thermal Properties

Latent Heat of Fusion, J/g 350
330
Melting Completion (Liquidus), °C 610
1350
Melting Onset (Solidus), °C 590
1190
Specific Heat Capacity, J/kg-K 990
450
Thermal Conductivity, W/m-K 140
15
Thermal Expansion, µm/m-K 27
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 31
1.9
Electrical Conductivity: Equal Weight (Specific), % IACS 170
2.1

Otherwise Unclassified Properties

Density, g/cm3 1.7
8.4
Embodied Carbon, kg CO2/kg material 24
8.0
Embodied Energy, MJ/kg 160
110
Embodied Water, L/kg 970
520

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 6.1
57
Resilience: Unit (Modulus of Resilience), kJ/m3 250
570
Stiffness to Weight: Axial, points 15
15
Stiffness to Weight: Bending, points 71
24
Strength to Weight: Axial, points 41
23
Strength to Weight: Bending, points 52
21
Thermal Diffusivity, mm2/s 81
3.8
Thermal Shock Resistance, points 14
21

Alloy Composition


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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 0.050
0
Iron (Fe), % 0
0 to 3.0
Magnesium (Mg), % 97.5 to 98.8
0
Manganese (Mn), % 1.2 to 2.0
0
Molybdenum (Mo), % 0
4.5 to 6.0
Nickel (Ni), % 0 to 0.010
2.0 to 3.0
Silicon (Si), % 0 to 0.1
0 to 1.5
Residuals, % 0 to 0.3
0