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ISO-WD32250 Magnesium vs. R31537 Cobalt

ISO-WD32250 magnesium belongs to the magnesium alloys classification, while R31537 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-WD32250 magnesium and the bottom bar is R31537 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 45
220
Elongation at Break, % 4.5 to 8.6
14 to 23
Fatigue Strength, MPa 170 to 210
310 to 480
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 17
87
Tensile Strength: Ultimate (UTS), MPa 310 to 330
1000 to 1340
Tensile Strength: Yield (Proof), MPa 240 to 290
590 to 940

Thermal Properties

Latent Heat of Fusion, J/g 340
320
Melting Completion (Liquidus), °C 600
1360
Melting Onset (Solidus), °C 550
1290
Specific Heat Capacity, J/kg-K 980
450
Thermal Conductivity, W/m-K 130
13
Thermal Expansion, µm/m-K 26
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 25
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 130
2.1

Otherwise Unclassified Properties

Density, g/cm3 1.8
8.4
Embodied Carbon, kg CO2/kg material 24
8.1
Embodied Energy, MJ/kg 160
110
Embodied Water, L/kg 950
530

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 14 to 26
140 to 200
Resilience: Unit (Modulus of Resilience), kJ/m3 630 to 930
780 to 1990
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 67
24
Strength to Weight: Axial, points 49 to 51
33 to 44
Strength to Weight: Bending, points 58 to 60
26 to 32
Thermal Diffusivity, mm2/s 72
3.4
Thermal Shock Resistance, points 19 to 20
24 to 32

Alloy Composition


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Carbon (C), % 0
0 to 0.14
Chromium (Cr), % 0
26 to 30
Cobalt (Co), % 0
58.9 to 69
Iron (Fe), % 0
0 to 0.75
Magnesium (Mg), % 94.9 to 97.1
0
Manganese (Mn), % 0
0 to 1.0
Molybdenum (Mo), % 0
5.0 to 7.0
Nickel (Ni), % 0
0 to 1.0
Nitrogen (N), % 0
0 to 0.25
Silicon (Si), % 0
0 to 1.0
Zinc (Zn), % 2.5 to 4.0
0
Zirconium (Zr), % 0.45 to 0.8
0
Residuals, % 0 to 0.3
0