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AS41B Magnesium vs. R30075 Cobalt

AS41B magnesium belongs to the magnesium alloys classification, while R30075 cobalt belongs to the cobalt alloys. There are 27 material properties with values for both materials. Properties with values for just one material (4, 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 R30075 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 45
210 to 250
Elongation at Break, % 6.0
12
Fatigue Strength, MPa 97
250 to 840
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 18
82 to 98
Tensile Strength: Ultimate (UTS), MPa 210
780 to 1280
Tensile Strength: Yield (Proof), MPa 140
480 to 840

Thermal Properties

Latent Heat of Fusion, J/g 370
320
Melting Completion (Liquidus), °C 620
1360
Melting Onset (Solidus), °C 570
1290
Specific Heat Capacity, J/kg-K 1000
450
Thermal Conductivity, W/m-K 68
13
Thermal Expansion, µm/m-K 26
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 17
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 92
2.1

Otherwise Unclassified Properties

Density, g/cm3 1.7
8.4
Embodied Carbon, kg CO2/kg material 23
8.1
Embodied Energy, MJ/kg 160
110
Embodied Water, L/kg 980
530

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 11
84 to 140
Resilience: Unit (Modulus of Resilience), kJ/m3 220
560 to 1410
Stiffness to Weight: Axial, points 15
14 to 17
Stiffness to Weight: Bending, points 72
24 to 25
Strength to Weight: Axial, points 35
26 to 42
Strength to Weight: Bending, points 47
22 to 31
Thermal Diffusivity, mm2/s 41
3.5
Thermal Shock Resistance, points 13
21 to 29

Alloy Composition

Aluminum (Al), % 3.5 to 5.0
0 to 0.1
Boron (B), % 0
0 to 0.010
Carbon (C), % 0
0 to 0.35
Chromium (Cr), % 0
27 to 30
Cobalt (Co), % 0
58.7 to 68
Copper (Cu), % 0 to 0.020
0
Iron (Fe), % 0 to 0.0035
0 to 0.75
Magnesium (Mg), % 92.7 to 95.7
0
Manganese (Mn), % 0.35 to 0.7
0 to 1.0
Molybdenum (Mo), % 0
5.0 to 7.0
Nickel (Ni), % 0 to 0.0020
0 to 0.5
Nitrogen (N), % 0
0 to 0.25
Phosphorus (P), % 0
0 to 0.020
Silicon (Si), % 0.5 to 1.5
0 to 1.0
Sulfur (S), % 0
0 to 0.010
Titanium (Ti), % 0
0 to 0.1
Tungsten (W), % 0
0 to 0.2
Zinc (Zn), % 0 to 0.12
0