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EQ21A Magnesium vs. R30008 Cobalt

EQ21A magnesium belongs to the magnesium alloys classification, while R30008 cobalt belongs to the cobalt alloys. There are 22 material properties with values for both materials. Properties with values for just one material (12, 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 R30008 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 44
210
Elongation at Break, % 2.4
1.1 to 73
Fatigue Strength, MPa 110
320 to 530
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 17
83
Tensile Strength: Ultimate (UTS), MPa 250
950 to 1700
Tensile Strength: Yield (Proof), MPa 190
500 to 1080

Thermal Properties

Latent Heat of Fusion, J/g 340
320
Melting Completion (Liquidus), °C 640
1400
Melting Onset (Solidus), °C 560
1330
Specific Heat Capacity, J/kg-K 980
450
Thermal Expansion, µm/m-K 27
13

Otherwise Unclassified Properties

Base Metal Price, % relative 80
95
Density, g/cm3 1.9
8.4
Embodied Carbon, kg CO2/kg material 27
8.1
Embodied Energy, MJ/kg 210
110

Common Calculations

Resilience: Unit (Modulus of Resilience), kJ/m3 410
590 to 2720
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 63
24
Strength to Weight: Axial, points 37
31 to 56
Strength to Weight: Bending, points 47
25 to 37
Thermal Shock Resistance, points 15
25 to 44

Alloy Composition


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Boron (B), % 0
0 to 0.0010
Carbon (C), % 0
0 to 0.15
Chromium (Cr), % 0
18.5 to 21.5
Cobalt (Co), % 0
39 to 42
Copper (Cu), % 0.050 to 0.1
0
Iron (Fe), % 0
7.6 to 20
Magnesium (Mg), % 93.9 to 96.8
0
Manganese (Mn), % 0
1.0 to 2.0
Molybdenum (Mo), % 0
6.5 to 7.5
Nickel (Ni), % 0 to 0.010
15 to 18
Phosphorus (P), % 0
0 to 0.015
Silicon (Si), % 0
0 to 1.2
Silver (Ag), % 1.3 to 1.7
0
Sulfur (S), % 0
0 to 0.015
Unspecified Rare Earths, % 1.5 to 3.0
0
Zirconium (Zr), % 0.4 to 1.0
0
Residuals, % 0 to 0.3
0