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EQ21A Magnesium vs. R31539 Cobalt

EQ21A magnesium belongs to the magnesium alloys classification, while R31539 cobalt belongs to the cobalt alloys. There are 26 material properties with values for both materials. Properties with values for just one material (10, 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 EQ21A magnesium and the bottom bar is R31539 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 44
220
Elongation at Break, % 2.4
13 to 22
Fatigue Strength, MPa 110
310 to 480
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 17
86
Tensile Strength: Ultimate (UTS), MPa 250
1000 to 1340
Tensile Strength: Yield (Proof), MPa 190
590 to 940

Thermal Properties

Latent Heat of Fusion, J/g 340
320
Melting Completion (Liquidus), °C 640
1360
Melting Onset (Solidus), °C 560
1290
Specific Heat Capacity, J/kg-K 980
450
Thermal Conductivity, W/m-K 110
13
Thermal Expansion, µm/m-K 27
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 25
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 120
2.1

Otherwise Unclassified Properties

Density, g/cm3 1.9
8.4
Embodied Carbon, kg CO2/kg material 27
8.2
Embodied Energy, MJ/kg 210
110

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 5.6
140 to 190
Resilience: Unit (Modulus of Resilience), kJ/m3 410
780 to 2000
Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 63
24
Strength to Weight: Axial, points 37
33 to 44
Strength to Weight: Bending, points 47
27 to 32
Thermal Diffusivity, mm2/s 62
3.5
Thermal Shock Resistance, points 15
24 to 32

Alloy Composition


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Aluminum (Al), % 0
0.3 to 1.0
Carbon (C), % 0
0 to 0.14
Chromium (Cr), % 0
26 to 30
Cobalt (Co), % 0
57.7 to 68.7
Copper (Cu), % 0.050 to 0.1
0
Iron (Fe), % 0
0 to 0.75
Lanthanum (La), % 0
0.030 to 0.2
Magnesium (Mg), % 93.9 to 96.8
0
Manganese (Mn), % 0
0 to 1.0
Molybdenum (Mo), % 0
5.0 to 7.0
Nickel (Ni), % 0 to 0.010
0 to 1.0
Nitrogen (N), % 0
0 to 0.25
Silicon (Si), % 0
0 to 1.0
Silver (Ag), % 1.3 to 1.7
0
Unspecified Rare Earths, % 1.5 to 3.0
0
Zirconium (Zr), % 0.4 to 1.0
0
Residuals, % 0 to 0.3
0