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WE43A Magnesium vs. R31538 Cobalt

WE43A magnesium belongs to the magnesium alloys classification, while R31538 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 WE43A magnesium and the bottom bar is R31538 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 44
220
Elongation at Break, % 5.2 to 5.4
13 to 23
Fatigue Strength, MPa 85 to 120
310 to 480
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 17
86
Tensile Strength: Ultimate (UTS), MPa 250 to 270
1020 to 1360
Tensile Strength: Yield (Proof), MPa 160 to 170
580 to 930

Thermal Properties

Latent Heat of Fusion, J/g 330
320
Melting Completion (Liquidus), °C 640
1360
Melting Onset (Solidus), °C 570
1290
Specific Heat Capacity, J/kg-K 960
450
Thermal Conductivity, W/m-K 51
13
Thermal Expansion, µm/m-K 27
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 12
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 55
2.1

Otherwise Unclassified Properties

Density, g/cm3 1.9
8.4
Embodied Carbon, kg CO2/kg material 28
8.1
Embodied Energy, MJ/kg 250
110
Embodied Water, L/kg 910
530

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 12
140 to 200
Resilience: Unit (Modulus of Resilience), kJ/m3 280 to 310
750 to 1920
Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 61
24
Strength to Weight: Axial, points 36 to 39
34 to 45
Strength to Weight: Bending, points 46 to 48
27 to 32
Thermal Diffusivity, mm2/s 28
3.5
Thermal Shock Resistance, points 15 to 16
25 to 33

Alloy Composition


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Carbon (C), % 0
0.15 to 0.35
Chromium (Cr), % 0
26 to 30
Cobalt (Co), % 0
58.7 to 68.9
Copper (Cu), % 0 to 0.030
0
Iron (Fe), % 0 to 0.010
0 to 0.75
Lithium (Li), % 0 to 0.2
0
Magnesium (Mg), % 89.5 to 93.5
0
Manganese (Mn), % 0 to 0.15
0 to 1.0
Molybdenum (Mo), % 0
5.0 to 7.0
Nickel (Ni), % 0 to 0.0050
0 to 1.0
Nitrogen (N), % 0
0 to 0.25
Silicon (Si), % 0 to 0.010
0 to 1.0
Unspecified Rare Earths, % 2.4 to 4.4
0
Yttrium (Y), % 3.7 to 4.3
0
Zinc (Zn), % 0 to 0.2
0
Zirconium (Zr), % 0.4 to 1.0
0
Residuals, % 0 to 0.3
0