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8090 Aluminum vs. R30816 Cobalt

8090 aluminum belongs to the aluminum alloys classification, while R30816 cobalt belongs to the cobalt alloys. There are 25 material properties with values for both materials. Properties with values for just one material (7, 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 R30816 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 67
210
Elongation at Break, % 3.5 to 13
23
Fatigue Strength, MPa 91 to 140
250
Poisson's Ratio 0.33
0.3
Shear Modulus, GPa 25
81
Tensile Strength: Ultimate (UTS), MPa 340 to 490
1020
Tensile Strength: Yield (Proof), MPa 210 to 420
460

Thermal Properties

Latent Heat of Fusion, J/g 400
300
Melting Completion (Liquidus), °C 660
1540
Melting Onset (Solidus), °C 600
1460
Specific Heat Capacity, J/kg-K 960
420
Thermal Conductivity, W/m-K 95 to 160
13
Thermal Expansion, µm/m-K 24
12

Otherwise Unclassified Properties

Density, g/cm3 2.7
9.1
Embodied Carbon, kg CO2/kg material 8.6
20
Embodied Energy, MJ/kg 170
320
Embodied Water, L/kg 1160
440

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 16 to 41
190
Resilience: Unit (Modulus of Resilience), kJ/m3 340 to 1330
510
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 50
22
Strength to Weight: Axial, points 34 to 49
31
Strength to Weight: Bending, points 39 to 50
25
Thermal Diffusivity, mm2/s 36 to 60
3.3
Thermal Shock Resistance, points 15 to 22
28

Alloy Composition

Aluminum (Al), % 93 to 98.4
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), % 1.0 to 1.6
0
Iron (Fe), % 0 to 0.3
0 to 5.0
Lithium (Li), % 2.2 to 2.7
0
Magnesium (Mg), % 0.6 to 1.3
0
Manganese (Mn), % 0 to 0.1
1.0 to 2.0
Molybdenum (Mo), % 0
3.5 to 4.5
Nickel (Ni), % 0
19 to 21
Niobium (Nb), % 0
3.5 to 4.5
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 0.2
0 to 1.0
Sulfur (S), % 0
0 to 0.030
Tantalum (Ta), % 0
3.5 to 4.5
Titanium (Ti), % 0 to 0.1
0
Tungsten (W), % 0
3.5 to 4.5
Zinc (Zn), % 0 to 0.25
0
Zirconium (Zr), % 0.040 to 0.16
0
Residuals, % 0 to 0.15
0