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AZ91A Magnesium vs. R30006 Cobalt

AZ91A magnesium belongs to the magnesium alloys classification, while R30006 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 AZ91A magnesium and the bottom bar is R30006 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Compressive (Crushing) Strength, MPa 160
1520
Elastic (Young's, Tensile) Modulus, GPa 46
220
Elongation at Break, % 5.0
1.0
Fatigue Strength, MPa 99
260
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 18
85
Tensile Strength: Ultimate (UTS), MPa 240
900
Tensile Strength: Yield (Proof), MPa 160
540

Thermal Properties

Latent Heat of Fusion, J/g 360
320
Melting Completion (Liquidus), °C 600
1400
Melting Onset (Solidus), °C 470
1290
Specific Heat Capacity, J/kg-K 990
450
Thermal Conductivity, W/m-K 73
15
Thermal Expansion, µm/m-K 26
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 10
1.6
Electrical Conductivity: Equal Weight (Specific), % IACS 52
1.7

Otherwise Unclassified Properties

Density, g/cm3 1.7
8.6
Embodied Carbon, kg CO2/kg material 22
7.8
Embodied Energy, MJ/kg 160
110
Embodied Water, L/kg 990
500

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 11
7.8
Resilience: Unit (Modulus of Resilience), kJ/m3 280
670
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 69
23
Strength to Weight: Axial, points 38
29
Strength to Weight: Bending, points 49
24
Thermal Diffusivity, mm2/s 42
3.9
Thermal Shock Resistance, points 14
26

Alloy Composition

Aluminum (Al), % 8.3 to 9.7
0
Carbon (C), % 0
0.9 to 1.4
Chromium (Cr), % 0
27 to 32
Cobalt (Co), % 0
48.6 to 68.1
Copper (Cu), % 0 to 0.1
0
Iron (Fe), % 0
0 to 3.0
Magnesium (Mg), % 88.2 to 91.2
0
Manganese (Mn), % 0.13 to 0.5
0
Molybdenum (Mo), % 0
0 to 1.0
Nickel (Ni), % 0 to 0.030
0 to 3.0
Silicon (Si), % 0 to 0.5
0 to 2.0
Tungsten (W), % 0
4.0 to 6.0
Zinc (Zn), % 0.35 to 1.0
0