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2018 Aluminum vs. R30816 Cobalt

2018 aluminum belongs to the aluminum 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 (6, 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 2018 aluminum and the bottom bar is R30816 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 120
280
Elastic (Young's, Tensile) Modulus, GPa 73
210
Elongation at Break, % 9.6
23
Fatigue Strength, MPa 120
250
Poisson's Ratio 0.33
0.3
Shear Modulus, GPa 27
81
Tensile Strength: Ultimate (UTS), MPa 420
1020
Tensile Strength: Yield (Proof), MPa 310
460

Thermal Properties

Latent Heat of Fusion, J/g 390
300
Melting Completion (Liquidus), °C 640
1540
Melting Onset (Solidus), °C 510
1460
Specific Heat Capacity, J/kg-K 870
420
Thermal Conductivity, W/m-K 150
13
Thermal Expansion, µm/m-K 22
12

Otherwise Unclassified Properties

Density, g/cm3 3.1
9.1
Embodied Carbon, kg CO2/kg material 8.1
20
Embodied Energy, MJ/kg 150
320
Embodied Water, L/kg 1130
440

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 37
190
Resilience: Unit (Modulus of Resilience), kJ/m3 670
510
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 45
22
Strength to Weight: Axial, points 38
31
Strength to Weight: Bending, points 41
25
Thermal Diffusivity, mm2/s 57
3.3
Thermal Shock Resistance, points 19
28

Alloy Composition


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Aluminum (Al), % 89.7 to 94.4
0
Carbon (C), % 0
0.32 to 0.42
Chromium (Cr), % 0 to 0.1
19 to 21
Cobalt (Co), % 0
40 to 49.8
Copper (Cu), % 3.5 to 4.5
0
Iron (Fe), % 0 to 1.0
0 to 5.0
Magnesium (Mg), % 0.45 to 0.9
0
Manganese (Mn), % 0 to 0.2
1.0 to 2.0
Molybdenum (Mo), % 0
3.5 to 4.5
Nickel (Ni), % 1.7 to 2.3
19 to 21
Niobium (Nb), % 0
3.5 to 4.5
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 0.9
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 to 0.25
0
Residuals, % 0 to 0.15
0