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8090 Aluminum vs. R30021 Cobalt

8090 aluminum belongs to the aluminum alloys classification, while R30021 cobalt belongs to the cobalt 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 8090 aluminum and the bottom bar is R30021 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 67
220
Elongation at Break, % 3.5 to 13
9.0
Fatigue Strength, MPa 91 to 140
250
Poisson's Ratio 0.33
0.29
Shear Modulus, GPa 25
86
Tensile Strength: Ultimate (UTS), MPa 340 to 490
700
Tensile Strength: Yield (Proof), MPa 210 to 420
500

Thermal Properties

Latent Heat of Fusion, J/g 400
330
Melting Completion (Liquidus), °C 660
1350
Melting Onset (Solidus), °C 600
1190
Specific Heat Capacity, J/kg-K 960
450
Thermal Conductivity, W/m-K 95 to 160
15
Thermal Expansion, µm/m-K 24
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 20
1.9
Electrical Conductivity: Equal Weight (Specific), % IACS 66
2.1

Otherwise Unclassified Properties

Density, g/cm3 2.7
8.4
Embodied Carbon, kg CO2/kg material 8.6
8.0
Embodied Energy, MJ/kg 170
110
Embodied Water, L/kg 1160
520

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 16 to 41
57
Resilience: Unit (Modulus of Resilience), kJ/m3 340 to 1330
570
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 50
24
Strength to Weight: Axial, points 34 to 49
23
Strength to Weight: Bending, points 39 to 50
21
Thermal Diffusivity, mm2/s 36 to 60
3.8
Thermal Shock Resistance, points 15 to 22
21

Alloy Composition


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Aluminum (Al), % 93 to 98.4
0
Carbon (C), % 0
0.2 to 0.35
Chromium (Cr), % 0 to 0.1
26 to 29
Cobalt (Co), % 0
61.7 to 67.3
Copper (Cu), % 1.0 to 1.6
0
Iron (Fe), % 0 to 0.3
0 to 3.0
Lithium (Li), % 2.2 to 2.7
0
Magnesium (Mg), % 0.6 to 1.3
0
Manganese (Mn), % 0 to 0.1
0
Molybdenum (Mo), % 0
4.5 to 6.0
Nickel (Ni), % 0
2.0 to 3.0
Silicon (Si), % 0 to 0.2
0 to 1.5
Titanium (Ti), % 0 to 0.1
0
Zinc (Zn), % 0 to 0.25
0
Zirconium (Zr), % 0.040 to 0.16
0
Residuals, % 0 to 0.15
0