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AZ91B Magnesium vs. R30008 Cobalt

AZ91B magnesium belongs to the magnesium alloys classification, while R30008 cobalt belongs to the cobalt alloys. There are 23 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 AZ91B magnesium and the bottom bar is R30008 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 46
210
Elongation at Break, % 5.0
1.1 to 73
Fatigue Strength, MPa 79
320 to 530
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 18
83
Tensile Strength: Ultimate (UTS), MPa 240
950 to 1700
Tensile Strength: Yield (Proof), MPa 160
500 to 1080

Thermal Properties

Latent Heat of Fusion, J/g 360
320
Melting Completion (Liquidus), °C 600
1400
Melting Onset (Solidus), °C 470
1330
Specific Heat Capacity, J/kg-K 990
450
Thermal Expansion, µm/m-K 26
13

Otherwise Unclassified Properties

Base Metal Price, % relative 12
95
Density, g/cm3 1.7
8.4
Embodied Carbon, kg CO2/kg material 22
8.1
Embodied Energy, MJ/kg 160
110
Embodied Water, L/kg 990
400

Common Calculations

Resilience: Unit (Modulus of Resilience), kJ/m3 280
590 to 2720
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 69
24
Strength to Weight: Axial, points 38
31 to 56
Strength to Weight: Bending, points 49
25 to 37
Thermal Shock Resistance, points 14
25 to 44

Alloy Composition

Aluminum (Al), % 8.3 to 9.7
0
Boron (B), % 0
0 to 0.0010
Carbon (C), % 0
0 to 0.15
Chromium (Cr), % 0
18.5 to 21.5
Cobalt (Co), % 0
39 to 42
Copper (Cu), % 0 to 0.35
0
Iron (Fe), % 0
7.6 to 20
Magnesium (Mg), % 87.9 to 91.2
0
Manganese (Mn), % 0.13 to 0.5
1.0 to 2.0
Molybdenum (Mo), % 0
6.5 to 7.5
Nickel (Ni), % 0 to 0.030
15 to 18
Phosphorus (P), % 0
0 to 0.015
Silicon (Si), % 0 to 0.5
0 to 1.2
Sulfur (S), % 0
0 to 0.015
Zinc (Zn), % 0.35 to 1.0
0