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AS41B Magnesium vs. R30816 Cobalt

AS41B magnesium belongs to the magnesium alloys classification, while R30816 cobalt belongs to the cobalt alloys. There are 25 material properties with values for both materials. Properties with values for just one material (7, 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 AS41B magnesium and the bottom bar is R30816 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 45
210
Elongation at Break, % 6.0
23
Fatigue Strength, MPa 97
250
Poisson's Ratio 0.29
0.3
Shear Modulus, GPa 18
81
Tensile Strength: Ultimate (UTS), MPa 210
1020
Tensile Strength: Yield (Proof), MPa 140
460

Thermal Properties

Latent Heat of Fusion, J/g 370
300
Melting Completion (Liquidus), °C 620
1540
Melting Onset (Solidus), °C 570
1460
Specific Heat Capacity, J/kg-K 1000
420
Thermal Conductivity, W/m-K 68
13
Thermal Expansion, µm/m-K 26
12

Otherwise Unclassified Properties

Density, g/cm3 1.7
9.1
Embodied Carbon, kg CO2/kg material 23
20
Embodied Energy, MJ/kg 160
320
Embodied Water, L/kg 980
440

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 11
190
Resilience: Unit (Modulus of Resilience), kJ/m3 220
510
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 72
22
Strength to Weight: Axial, points 35
31
Strength to Weight: Bending, points 47
25
Thermal Diffusivity, mm2/s 41
3.3
Thermal Shock Resistance, points 13
28

Alloy Composition

Aluminum (Al), % 3.5 to 5.0
0
Carbon (C), % 0
0.32 to 0.42
Chromium (Cr), % 0
19 to 21
Cobalt (Co), % 0
40 to 49.8
Copper (Cu), % 0 to 0.020
0
Iron (Fe), % 0 to 0.0035
0 to 5.0
Magnesium (Mg), % 92.7 to 95.7
0
Manganese (Mn), % 0.35 to 0.7
1.0 to 2.0
Molybdenum (Mo), % 0
3.5 to 4.5
Nickel (Ni), % 0 to 0.0020
19 to 21
Niobium (Nb), % 0
3.5 to 4.5
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0.5 to 1.5
0 to 1.0
Sulfur (S), % 0
0 to 0.030
Tantalum (Ta), % 0
3.5 to 4.5
Tungsten (W), % 0
3.5 to 4.5
Zinc (Zn), % 0 to 0.12
0