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AZ91B Magnesium vs. R30605 Cobalt

AZ91B magnesium belongs to the magnesium alloys classification, while R30605 cobalt belongs to the cobalt alloys. There are 25 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 AZ91B magnesium and the bottom bar is R30605 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 46
210
Elongation at Break, % 5.0
34
Fatigue Strength, MPa 79
260 to 590
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 18
81
Tensile Strength: Ultimate (UTS), MPa 240
1130 to 1900
Tensile Strength: Yield (Proof), MPa 160
470 to 1600

Thermal Properties

Latent Heat of Fusion, J/g 360
290
Melting Completion (Liquidus), °C 600
1410
Melting Onset (Solidus), °C 470
1330
Specific Heat Capacity, J/kg-K 990
410
Thermal Conductivity, W/m-K 73
9.6
Thermal Expansion, µm/m-K 26
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 11
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 58
1.8

Otherwise Unclassified Properties

Density, g/cm3 1.7
9.6
Embodied Carbon, kg CO2/kg material 22
9.8
Embodied Energy, MJ/kg 160
140
Embodied Water, L/kg 990
450

Common Calculations

Stiffness to Weight: Axial, points 15
12
Stiffness to Weight: Bending, points 69
21
Strength to Weight: Axial, points 38
33 to 55
Strength to Weight: Bending, points 49
25 to 36
Thermal Diffusivity, mm2/s 42
2.5
Thermal Shock Resistance, points 14
31 to 52

Alloy Composition

Aluminum (Al), % 8.3 to 9.7
0
Carbon (C), % 0
0.050 to 0.15
Chromium (Cr), % 0
19 to 21
Cobalt (Co), % 0
46.4 to 57
Copper (Cu), % 0 to 0.35
0
Iron (Fe), % 0
0 to 3.0
Magnesium (Mg), % 87.9 to 91.2
0
Manganese (Mn), % 0.13 to 0.5
1.0 to 2.0
Nickel (Ni), % 0 to 0.030
9.0 to 11
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 0.5
0 to 0.4
Sulfur (S), % 0
0 to 0.030
Tungsten (W), % 0
14 to 16
Zinc (Zn), % 0.35 to 1.0
0