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QE22A Magnesium vs. R30016 Cobalt

QE22A magnesium belongs to the magnesium alloys classification, while R30016 cobalt belongs to the cobalt alloys. There are 27 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 QE22A magnesium and the bottom bar is R30016 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Compressive (Crushing) Strength, MPa 350
1600
Elastic (Young's, Tensile) Modulus, GPa 44
220
Elongation at Break, % 2.4
8.4
Fatigue Strength, MPa 110
290
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 17
85
Tensile Strength: Ultimate (UTS), MPa 250
1010
Tensile Strength: Yield (Proof), MPa 190
580

Thermal Properties

Latent Heat of Fusion, J/g 340
320
Melting Completion (Liquidus), °C 640
1360
Melting Onset (Solidus), °C 570
1270
Specific Heat Capacity, J/kg-K 970
450
Thermal Conductivity, W/m-K 110
15
Thermal Expansion, µm/m-K 27
14

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 25
1.9
Electrical Conductivity: Equal Weight (Specific), % IACS 120
2.0

Otherwise Unclassified Properties

Density, g/cm3 2.0
8.5
Embodied Carbon, kg CO2/kg material 27
7.7
Embodied Energy, MJ/kg 220
110

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 5.5
72
Resilience: Unit (Modulus of Resilience), kJ/m3 400
770
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 60
24
Strength to Weight: Axial, points 36
33
Strength to Weight: Bending, points 46
26
Thermal Diffusivity, mm2/s 59
3.9
Thermal Shock Resistance, points 15
24

Alloy Composition


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Carbon (C), % 0
0.9 to 1.4
Chromium (Cr), % 0
28 to 32
Cobalt (Co), % 0
49.6 to 66.9
Copper (Cu), % 0 to 0.1
0
Iron (Fe), % 0
0 to 3.0
Magnesium (Mg), % 93.1 to 95.8
0
Manganese (Mn), % 0
0.5 to 2.0
Molybdenum (Mo), % 0
0 to 1.5
Nickel (Ni), % 0 to 0.010
0 to 3.0
Silicon (Si), % 0
0.2 to 2.0
Silver (Ag), % 2.0 to 3.0
0
Tungsten (W), % 0
3.5 to 5.5
Unspecified Rare Earths, % 1.8 to 2.5
0
Zirconium (Zr), % 0.4 to 1.0
0
Residuals, % 0 to 0.3
0