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WE43A Magnesium vs. R30012 Cobalt

WE43A magnesium belongs to the magnesium alloys classification, while R30012 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 R30012 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 44
220
Elongation at Break, % 5.2 to 5.4
1.0
Fatigue Strength, MPa 85 to 120
320
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 17
86
Tensile Strength: Ultimate (UTS), MPa 250 to 270
830
Tensile Strength: Yield (Proof), MPa 160 to 170
650

Thermal Properties

Latent Heat of Fusion, J/g 330
320
Melting Completion (Liquidus), °C 640
1470
Melting Onset (Solidus), °C 570
1280
Specific Heat Capacity, J/kg-K 960
440
Thermal Conductivity, W/m-K 51
15
Thermal Expansion, µm/m-K 27
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 12
1.8
Electrical Conductivity: Equal Weight (Specific), % IACS 55
1.8

Otherwise Unclassified Properties

Density, g/cm3 1.9
8.8
Embodied Carbon, kg CO2/kg material 28
8.3
Embodied Energy, MJ/kg 250
120
Embodied Water, L/kg 910
480

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 12
7.7
Resilience: Unit (Modulus of Resilience), kJ/m3 280 to 310
960
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 61
23
Strength to Weight: Axial, points 36 to 39
26
Strength to Weight: Bending, points 46 to 48
22
Thermal Diffusivity, mm2/s 28
3.8
Thermal Shock Resistance, points 15 to 16
23

Alloy Composition


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Carbon (C), % 0
1.4 to 2.0
Chromium (Cr), % 0
27 to 32
Cobalt (Co), % 0
47.5 to 64.1
Copper (Cu), % 0 to 0.030
0
Iron (Fe), % 0 to 0.010
0 to 3.0
Lithium (Li), % 0 to 0.2
0
Magnesium (Mg), % 89.5 to 93.5
0
Manganese (Mn), % 0 to 0.15
0
Molybdenum (Mo), % 0
0 to 1.0
Nickel (Ni), % 0 to 0.0050
0 to 3.0
Silicon (Si), % 0 to 0.010
0 to 2.0
Tungsten (W), % 0
7.5 to 9.5
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