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R30155 Cobalt vs. 2218 Aluminum

R30155 cobalt belongs to the iron alloys classification, while 2218 aluminum belongs to the aluminum alloys. There are 29 material properties with values for both materials. Properties with values for just one material (5, 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 R30155 cobalt and the bottom bar is 2218 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 220
95 to 110
Elastic (Young's, Tensile) Modulus, GPa 210
73
Elongation at Break, % 34
6.8 to 10
Fatigue Strength, MPa 310
110
Poisson's Ratio 0.29
0.33
Shear Modulus, GPa 81
27
Shear Strength, MPa 570
210 to 250
Tensile Strength: Ultimate (UTS), MPa 850
330 to 430
Tensile Strength: Yield (Proof), MPa 390
260 to 310

Thermal Properties

Latent Heat of Fusion, J/g 300
390
Maximum Temperature: Mechanical, °C 1100
220
Melting Completion (Liquidus), °C 1470
640
Melting Onset (Solidus), °C 1420
510
Specific Heat Capacity, J/kg-K 450
870
Thermal Conductivity, W/m-K 12
140
Thermal Expansion, µm/m-K 14
22

Otherwise Unclassified Properties

Base Metal Price, % relative 80
11
Density, g/cm3 8.5
3.1
Embodied Carbon, kg CO2/kg material 9.7
8.2
Embodied Energy, MJ/kg 150
150
Embodied Water, L/kg 300
1130

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 230
27 to 31
Resilience: Unit (Modulus of Resilience), kJ/m3 370
450 to 650
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 23
45
Strength to Weight: Axial, points 28
30 to 39
Strength to Weight: Bending, points 24
34 to 41
Thermal Diffusivity, mm2/s 3.2
52
Thermal Shock Resistance, points 21
15 to 19

Alloy Composition

Aluminum (Al), % 0
88.8 to 93.6
Carbon (C), % 0.080 to 0.16
0
Chromium (Cr), % 20 to 22.5
0 to 0.1
Cobalt (Co), % 18.5 to 21
0
Copper (Cu), % 0
3.5 to 4.5
Iron (Fe), % 24.3 to 36.2
0 to 1.0
Magnesium (Mg), % 0
1.2 to 1.8
Manganese (Mn), % 1.0 to 2.0
0 to 0.2
Molybdenum (Mo), % 2.5 to 3.5
0
Nickel (Ni), % 19 to 21
1.7 to 2.3
Niobium (Nb), % 0.75 to 1.3
0
Nitrogen (N), % 0 to 0.2
0
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 1.0
0 to 0.9
Sulfur (S), % 0 to 0.030
0
Tantalum (Ta), % 0.75 to 1.3
0
Tungsten (W), % 2.0 to 3.0
0
Zinc (Zn), % 0
0 to 0.25
Residuals, % 0
0 to 0.15