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EN-MC21120 Magnesium vs. R30035 Cobalt

EN-MC21120 magnesium belongs to the magnesium alloys classification, while R30035 cobalt belongs to the cobalt alloys. There are 28 material properties with values for both materials. Properties with values for just one material (4, 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 R30035 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 46
220 to 230
Elongation at Break, % 2.2 to 6.7
9.0 to 46
Fatigue Strength, MPa 84 to 96
170 to 740
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 18
84 to 89
Tensile Strength: Ultimate (UTS), MPa 200 to 270
900 to 1900
Tensile Strength: Yield (Proof), MPa 130 to 170
300 to 1650

Thermal Properties

Latent Heat of Fusion, J/g 350
320
Melting Completion (Liquidus), °C 600
1440
Melting Onset (Solidus), °C 490
1320
Specific Heat Capacity, J/kg-K 990
440
Thermal Conductivity, W/m-K 76
11
Thermal Expansion, µm/m-K 26
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 11
1.7
Electrical Conductivity: Equal Weight (Specific), % IACS 59
1.8

Otherwise Unclassified Properties

Base Metal Price, % relative 12
100
Density, g/cm3 1.7
8.7
Embodied Carbon, kg CO2/kg material 22
10
Embodied Energy, MJ/kg 160
140
Embodied Water, L/kg 990
410

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 5.0 to 15
160 to 320
Resilience: Unit (Modulus of Resilience), kJ/m3 180 to 320
210 to 5920
Stiffness to Weight: Axial, points 15
14 to 15
Stiffness to Weight: Bending, points 69
23 to 24
Strength to Weight: Axial, points 31 to 43
29 to 61
Strength to Weight: Bending, points 43 to 53
24 to 39
Thermal Diffusivity, mm2/s 44
3.0
Thermal Shock Resistance, points 11 to 16
23 to 46

Alloy Composition


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Aluminum (Al), % 8.3 to 9.7
0
Boron (B), % 0
0 to 0.015
Carbon (C), % 0
0 to 0.025
Chromium (Cr), % 0
19 to 21
Cobalt (Co), % 0
29.1 to 39
Copper (Cu), % 0 to 0.030
0
Iron (Fe), % 0 to 0.0050
0 to 1.0
Magnesium (Mg), % 88.6 to 91.3
0
Manganese (Mn), % 0.1 to 0.5
0 to 0.15
Molybdenum (Mo), % 0
9.0 to 10.5
Nickel (Ni), % 0 to 0.0020
33 to 37
Phosphorus (P), % 0
0 to 0.015
Silicon (Si), % 0 to 0.2
0 to 0.15
Sulfur (S), % 0
0 to 0.010
Titanium (Ti), % 0
0 to 1.0
Zinc (Zn), % 0.35 to 1.0
0
Residuals, % 0 to 0.010
0