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AZ91A Magnesium vs. R30816 Cobalt

AZ91A magnesium belongs to the magnesium alloys classification, while R30816 cobalt belongs to the cobalt alloys. There are 26 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 AZ91A magnesium and the bottom bar is R30816 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 63
280
Elastic (Young's, Tensile) Modulus, GPa 46
210
Elongation at Break, % 5.0
23
Fatigue Strength, MPa 99
250
Poisson's Ratio 0.29
0.3
Shear Modulus, GPa 18
81
Tensile Strength: Ultimate (UTS), MPa 240
1020
Tensile Strength: Yield (Proof), MPa 160
460

Thermal Properties

Latent Heat of Fusion, J/g 360
300
Melting Completion (Liquidus), °C 600
1540
Melting Onset (Solidus), °C 470
1460
Specific Heat Capacity, J/kg-K 990
420
Thermal Conductivity, W/m-K 73
13
Thermal Expansion, µm/m-K 26
12

Otherwise Unclassified Properties

Density, g/cm3 1.7
9.1
Embodied Carbon, kg CO2/kg material 22
20
Embodied Energy, MJ/kg 160
320
Embodied Water, L/kg 990
440

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 11
190
Resilience: Unit (Modulus of Resilience), kJ/m3 280
510
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 69
22
Strength to Weight: Axial, points 38
31
Strength to Weight: Bending, points 49
25
Thermal Diffusivity, mm2/s 42
3.3
Thermal Shock Resistance, points 14
28

Alloy Composition

Aluminum (Al), % 8.3 to 9.7
0
Carbon (C), % 0
0.32 to 0.42
Chromium (Cr), % 0
19 to 21
Cobalt (Co), % 0
40 to 49.8
Copper (Cu), % 0 to 0.1
0
Iron (Fe), % 0
0 to 5.0
Magnesium (Mg), % 88.2 to 91.2
0
Manganese (Mn), % 0.13 to 0.5
1.0 to 2.0
Molybdenum (Mo), % 0
3.5 to 4.5
Nickel (Ni), % 0 to 0.030
19 to 21
Niobium (Nb), % 0
3.5 to 4.5
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 0.5
0 to 1.0
Sulfur (S), % 0
0 to 0.030
Tantalum (Ta), % 0
3.5 to 4.5
Tungsten (W), % 0
3.5 to 4.5
Zinc (Zn), % 0.35 to 1.0
0