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EN-MC21220 Magnesium vs. R30012 Cobalt

EN-MC21220 magnesium belongs to the magnesium alloys classification, while R30012 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-MC21220 magnesium and the bottom bar is R30012 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 45
220
Elongation at Break, % 11
1.0
Fatigue Strength, MPa 89
320
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 17
86
Tensile Strength: Ultimate (UTS), MPa 210
830
Tensile Strength: Yield (Proof), MPa 120
650

Thermal Properties

Latent Heat of Fusion, J/g 350
320
Melting Completion (Liquidus), °C 600
1470
Melting Onset (Solidus), °C 540
1280
Specific Heat Capacity, J/kg-K 1000
440
Thermal Conductivity, W/m-K 65
15
Thermal Expansion, µm/m-K 27
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 16
1.8
Electrical Conductivity: Equal Weight (Specific), % IACS 87
1.8

Otherwise Unclassified Properties

Density, g/cm3 1.7
8.8
Embodied Carbon, kg CO2/kg material 23
8.3
Embodied Energy, MJ/kg 160
120
Embodied Water, L/kg 990
480

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 20
7.7
Resilience: Unit (Modulus of Resilience), kJ/m3 160
960
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 71
23
Strength to Weight: Axial, points 34
26
Strength to Weight: Bending, points 46
22
Thermal Diffusivity, mm2/s 39
3.8
Thermal Shock Resistance, points 12
23

Alloy Composition


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Aluminum (Al), % 4.4 to 5.5
0
Carbon (C), % 0
1.4 to 2.0
Chromium (Cr), % 0
27 to 32
Cobalt (Co), % 0
47.5 to 64.1
Copper (Cu), % 0 to 0.010
0
Iron (Fe), % 0 to 0.0050
0 to 3.0
Magnesium (Mg), % 93.5 to 95.5
0
Manganese (Mn), % 0.1 to 0.6
0
Molybdenum (Mo), % 0
0 to 1.0
Nickel (Ni), % 0 to 0.0020
0 to 3.0
Silicon (Si), % 0 to 0.1
0 to 2.0
Tungsten (W), % 0
7.5 to 9.5
Zinc (Zn), % 0 to 0.3
0
Residuals, % 0 to 0.010
0