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R30075 Cobalt vs. 2018 Aluminum

R30075 cobalt belongs to the cobalt alloys classification, while 2018 aluminum belongs to the aluminum alloys. There are 27 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 R30075 cobalt and the bottom bar is 2018 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210 to 250
73
Elongation at Break, % 12
9.6
Fatigue Strength, MPa 250 to 840
120
Poisson's Ratio 0.29
0.33
Shear Modulus, GPa 82 to 98
27
Tensile Strength: Ultimate (UTS), MPa 780 to 1280
420
Tensile Strength: Yield (Proof), MPa 480 to 840
310

Thermal Properties

Latent Heat of Fusion, J/g 320
390
Melting Completion (Liquidus), °C 1360
640
Melting Onset (Solidus), °C 1290
510
Specific Heat Capacity, J/kg-K 450
870
Thermal Conductivity, W/m-K 13
150
Thermal Expansion, µm/m-K 12
22

Electrical Properties

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

Otherwise Unclassified Properties

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

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 84 to 140
37
Resilience: Unit (Modulus of Resilience), kJ/m3 560 to 1410
670
Stiffness to Weight: Axial, points 14 to 17
13
Stiffness to Weight: Bending, points 24 to 25
45
Strength to Weight: Axial, points 26 to 42
38
Strength to Weight: Bending, points 22 to 31
41
Thermal Diffusivity, mm2/s 3.5
57
Thermal Shock Resistance, points 21 to 29
19

Alloy Composition

Aluminum (Al), % 0 to 0.1
89.7 to 94.4
Boron (B), % 0 to 0.010
0
Carbon (C), % 0 to 0.35
0
Chromium (Cr), % 27 to 30
0 to 0.1
Cobalt (Co), % 58.7 to 68
0
Copper (Cu), % 0
3.5 to 4.5
Iron (Fe), % 0 to 0.75
0 to 1.0
Magnesium (Mg), % 0
0.45 to 0.9
Manganese (Mn), % 0 to 1.0
0 to 0.2
Molybdenum (Mo), % 5.0 to 7.0
0
Nickel (Ni), % 0 to 0.5
1.7 to 2.3
Nitrogen (N), % 0 to 0.25
0
Phosphorus (P), % 0 to 0.020
0
Silicon (Si), % 0 to 1.0
0 to 0.9
Sulfur (S), % 0 to 0.010
0
Titanium (Ti), % 0 to 0.1
0
Tungsten (W), % 0 to 0.2
0
Zinc (Zn), % 0
0 to 0.25
Residuals, % 0
0 to 0.15