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AZ91D Magnesium vs. R30021 Cobalt

AZ91D magnesium belongs to the magnesium alloys classification, while R30021 cobalt belongs to the cobalt alloys. There are 28 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 AZ91D magnesium and the bottom bar is R30021 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Compressive (Crushing) Strength, MPa 310 to 430
1300
Elastic (Young's, Tensile) Modulus, GPa 46
220
Elongation at Break, % 2.3 to 4.5
9.0
Fatigue Strength, MPa 74 to 85
250
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 18
86
Tensile Strength: Ultimate (UTS), MPa 160 to 220
700
Tensile Strength: Yield (Proof), MPa 80 to 130
500

Thermal Properties

Latent Heat of Fusion, J/g 350
330
Melting Completion (Liquidus), °C 600
1350
Melting Onset (Solidus), °C 490
1190
Specific Heat Capacity, J/kg-K 990
450
Thermal Conductivity, W/m-K 78
15
Thermal Expansion, µm/m-K 27
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 11
1.9
Electrical Conductivity: Equal Weight (Specific), % IACS 58
2.1

Otherwise Unclassified Properties

Density, g/cm3 1.7
8.4
Embodied Carbon, kg CO2/kg material 22
8.0
Embodied Energy, MJ/kg 160
110
Embodied Water, L/kg 990
520

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 4.2 to 7.7
57
Resilience: Unit (Modulus of Resilience), kJ/m3 69 to 170
570
Stiffness to Weight: Axial, points 15
15
Stiffness to Weight: Bending, points 69
24
Strength to Weight: Axial, points 26 to 34
23
Strength to Weight: Bending, points 38 to 46
21
Thermal Diffusivity, mm2/s 45
3.8
Thermal Shock Resistance, points 9.5 to 13
21

Alloy Composition

Aluminum (Al), % 8.3 to 9.7
0
Carbon (C), % 0
0.2 to 0.35
Chromium (Cr), % 0
26 to 29
Cobalt (Co), % 0
61.7 to 67.3
Copper (Cu), % 0 to 0.030
0
Iron (Fe), % 0 to 0.0050
0 to 3.0
Magnesium (Mg), % 88.7 to 91.2
0
Manganese (Mn), % 0.15 to 0.5
0
Molybdenum (Mo), % 0
4.5 to 6.0
Nickel (Ni), % 0 to 0.0020
2.0 to 3.0
Silicon (Si), % 0 to 0.1
0 to 1.5
Zinc (Zn), % 0.35 to 1.0
0