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2018 Aluminum vs. R31537 Cobalt

2018 aluminum belongs to the aluminum alloys classification, while R31537 cobalt belongs to the cobalt alloys. There are 27 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 R31537 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 73
220
Elongation at Break, % 9.6
14 to 23
Fatigue Strength, MPa 120
310 to 480
Poisson's Ratio 0.33
0.29
Shear Modulus, GPa 27
87
Tensile Strength: Ultimate (UTS), MPa 420
1000 to 1340
Tensile Strength: Yield (Proof), MPa 310
590 to 940

Thermal Properties

Latent Heat of Fusion, J/g 390
320
Melting Completion (Liquidus), °C 640
1360
Melting Onset (Solidus), °C 510
1290
Specific Heat Capacity, J/kg-K 870
450
Thermal Conductivity, W/m-K 150
13
Thermal Expansion, µm/m-K 22
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 40
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 120
2.1

Otherwise Unclassified Properties

Density, g/cm3 3.1
8.4
Embodied Carbon, kg CO2/kg material 8.1
8.1
Embodied Energy, MJ/kg 150
110
Embodied Water, L/kg 1130
530

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 37
140 to 200
Resilience: Unit (Modulus of Resilience), kJ/m3 670
780 to 1990
Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 45
24
Strength to Weight: Axial, points 38
33 to 44
Strength to Weight: Bending, points 41
26 to 32
Thermal Diffusivity, mm2/s 57
3.4
Thermal Shock Resistance, points 19
24 to 32

Alloy Composition


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Aluminum (Al), % 89.7 to 94.4
0
Carbon (C), % 0
0 to 0.14
Chromium (Cr), % 0 to 0.1
26 to 30
Cobalt (Co), % 0
58.9 to 69
Copper (Cu), % 3.5 to 4.5
0
Iron (Fe), % 0 to 1.0
0 to 0.75
Magnesium (Mg), % 0.45 to 0.9
0
Manganese (Mn), % 0 to 0.2
0 to 1.0
Molybdenum (Mo), % 0
5.0 to 7.0
Nickel (Ni), % 1.7 to 2.3
0 to 1.0
Nitrogen (N), % 0
0 to 0.25
Silicon (Si), % 0 to 0.9
0 to 1.0
Zinc (Zn), % 0 to 0.25
0
Residuals, % 0 to 0.15
0