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EN-MC21320 Magnesium vs. R31233 Cobalt

EN-MC21320 magnesium belongs to the magnesium alloys classification, while R31233 cobalt belongs to the cobalt alloys. There are 27 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-MC21320 magnesium and the bottom bar is R31233 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 45
220
Elongation at Break, % 7.5
17
Fatigue Strength, MPa 95
220
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 18
85
Tensile Strength: Ultimate (UTS), MPa 230
1020
Tensile Strength: Yield (Proof), MPa 140
420

Thermal Properties

Latent Heat of Fusion, J/g 370
320
Melting Completion (Liquidus), °C 600
1350
Melting Onset (Solidus), °C 530
1330
Specific Heat Capacity, J/kg-K 1000
440
Thermal Conductivity, W/m-K 66
12
Thermal Expansion, µm/m-K 26
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 17
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 91
2.1

Otherwise Unclassified Properties

Density, g/cm3 1.6
8.6
Embodied Carbon, kg CO2/kg material 23
8.4
Embodied Energy, MJ/kg 160
110
Embodied Water, L/kg 980
480

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 15
140
Resilience: Unit (Modulus of Resilience), kJ/m3 200
410
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 72
23
Strength to Weight: Axial, points 38
33
Strength to Weight: Bending, points 50
26
Thermal Diffusivity, mm2/s 40
3.2
Thermal Shock Resistance, points 13
25

Alloy Composition


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Aluminum (Al), % 3.5 to 5.0
0
Boron (B), % 0
0 to 0.015
Carbon (C), % 0
0.020 to 0.1
Chromium (Cr), % 0
23.5 to 27.5
Cobalt (Co), % 0
44.7 to 63.3
Copper (Cu), % 0 to 0.010
0
Iron (Fe), % 0 to 0.0050
1.0 to 5.0
Magnesium (Mg), % 92.5 to 95.9
0
Manganese (Mn), % 0.1 to 0.7
0.1 to 1.5
Molybdenum (Mo), % 0
4.0 to 6.0
Nickel (Ni), % 0 to 0.0020
7.0 to 11
Nitrogen (N), % 0
0.030 to 0.12
Phosphorus (P), % 0
0 to 0.030
Silicon (Si), % 0.5 to 1.5
0.050 to 1.0
Sulfur (S), % 0
0 to 0.020
Tungsten (W), % 0
1.0 to 3.0
Zinc (Zn), % 0 to 0.2
0
Residuals, % 0 to 0.010
0