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EQ21A Magnesium vs. R30035 Cobalt

EQ21A magnesium belongs to the magnesium alloys classification, while R30035 cobalt belongs to the cobalt alloys. There are 27 material properties with values for both materials. Properties with values for just one material (8, 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 R30035 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 44
220 to 230
Elongation at Break, % 2.4
9.0 to 46
Fatigue Strength, MPa 110
170 to 740
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 17
84 to 89
Tensile Strength: Ultimate (UTS), MPa 250
900 to 1900
Tensile Strength: Yield (Proof), MPa 190
300 to 1650

Thermal Properties

Latent Heat of Fusion, J/g 340
320
Melting Completion (Liquidus), °C 640
1440
Melting Onset (Solidus), °C 560
1320
Specific Heat Capacity, J/kg-K 980
440
Thermal Conductivity, W/m-K 110
11
Thermal Expansion, µm/m-K 27
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 25
1.7
Electrical Conductivity: Equal Weight (Specific), % IACS 120
1.8

Otherwise Unclassified Properties

Base Metal Price, % relative 80
100
Density, g/cm3 1.9
8.7
Embodied Carbon, kg CO2/kg material 27
10
Embodied Energy, MJ/kg 210
140

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 5.6
160 to 320
Resilience: Unit (Modulus of Resilience), kJ/m3 410
210 to 5920
Stiffness to Weight: Axial, points 13
14 to 15
Stiffness to Weight: Bending, points 63
23 to 24
Strength to Weight: Axial, points 37
29 to 61
Strength to Weight: Bending, points 47
24 to 39
Thermal Diffusivity, mm2/s 62
3.0
Thermal Shock Resistance, points 15
23 to 46

Alloy Composition


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Boron (B), % 0
0 to 0.015
Carbon (C), % 0
0 to 0.025
Chromium (Cr), % 0
19 to 21
Cobalt (Co), % 0
29.1 to 39
Copper (Cu), % 0.050 to 0.1
0
Iron (Fe), % 0
0 to 1.0
Magnesium (Mg), % 93.9 to 96.8
0
Manganese (Mn), % 0
0 to 0.15
Molybdenum (Mo), % 0
9.0 to 10.5
Nickel (Ni), % 0 to 0.010
33 to 37
Phosphorus (P), % 0
0 to 0.015
Silicon (Si), % 0
0 to 0.15
Silver (Ag), % 1.3 to 1.7
0
Sulfur (S), % 0
0 to 0.010
Titanium (Ti), % 0
0 to 1.0
Unspecified Rare Earths, % 1.5 to 3.0
0
Zirconium (Zr), % 0.4 to 1.0
0
Residuals, % 0 to 0.3
0