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WE43A Magnesium vs. R30003 Cobalt

WE43A magnesium belongs to the magnesium alloys classification, while R30003 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 WE43A magnesium and the bottom bar is R30003 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 44
210
Elongation at Break, % 5.2 to 5.4
10 to 73
Fatigue Strength, MPa 85 to 120
320 to 560
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 17
83
Tensile Strength: Ultimate (UTS), MPa 250 to 270
970 to 1720
Tensile Strength: Yield (Proof), MPa 160 to 170
510 to 1090

Thermal Properties

Latent Heat of Fusion, J/g 330
310
Melting Completion (Liquidus), °C 640
1400
Melting Onset (Solidus), °C 570
1440
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

Base Metal Price, % relative 34
95
Density, g/cm3 1.9
8.4
Embodied Carbon, kg CO2/kg material 28
8.0
Embodied Energy, MJ/kg 250
110
Embodied Water, L/kg 910
400

Common Calculations

Resilience: Unit (Modulus of Resilience), kJ/m3 280 to 310
600 to 2790
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 61
24
Strength to Weight: Axial, points 36 to 39
32 to 57
Strength to Weight: Bending, points 46 to 48
26 to 38
Thermal Diffusivity, mm2/s 28
3.3
Thermal Shock Resistance, points 15 to 16
26 to 45

Alloy Composition


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Boron (B), % 0
0 to 0.1
Carbon (C), % 0
0 to 0.15
Chromium (Cr), % 0
19 to 21
Cobalt (Co), % 0
39 to 41
Copper (Cu), % 0 to 0.030
0
Iron (Fe), % 0 to 0.010
10 to 20.5
Lithium (Li), % 0 to 0.2
0
Magnesium (Mg), % 89.5 to 93.5
0
Manganese (Mn), % 0 to 0.15
1.5 to 2.5
Molybdenum (Mo), % 0
6.0 to 8.0
Nickel (Ni), % 0 to 0.0050
14 to 16
Phosphorus (P), % 0
0 to 0.015
Silicon (Si), % 0 to 0.010
0 to 1.2
Sulfur (S), % 0
0 to 0.015
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