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8090 Aluminum vs. R30155 Cobalt

8090 aluminum belongs to the aluminum alloys classification, while R30155 cobalt belongs to the iron alloys. There are 27 material properties with values for both materials. Properties with values for just one material (8, 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 R30155 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 67
210
Elongation at Break, % 3.5 to 13
34
Fatigue Strength, MPa 91 to 140
310
Poisson's Ratio 0.33
0.29
Shear Modulus, GPa 25
81
Tensile Strength: Ultimate (UTS), MPa 340 to 490
850
Tensile Strength: Yield (Proof), MPa 210 to 420
390

Thermal Properties

Latent Heat of Fusion, J/g 400
300
Maximum Temperature: Mechanical, °C 190
1100
Melting Completion (Liquidus), °C 660
1470
Melting Onset (Solidus), °C 600
1420
Specific Heat Capacity, J/kg-K 960
450
Thermal Conductivity, W/m-K 95 to 160
12
Thermal Expansion, µm/m-K 24
14

Otherwise Unclassified Properties

Base Metal Price, % relative 18
80
Density, g/cm3 2.7
8.5
Embodied Carbon, kg CO2/kg material 8.6
9.7
Embodied Energy, MJ/kg 170
150
Embodied Water, L/kg 1160
300

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 16 to 41
230
Resilience: Unit (Modulus of Resilience), kJ/m3 340 to 1330
370
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 50
23
Strength to Weight: Axial, points 34 to 49
28
Strength to Weight: Bending, points 39 to 50
24
Thermal Diffusivity, mm2/s 36 to 60
3.2
Thermal Shock Resistance, points 15 to 22
21

Alloy Composition


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Aluminum (Al), % 93 to 98.4
0
Carbon (C), % 0
0.080 to 0.16
Chromium (Cr), % 0 to 0.1
20 to 22.5
Cobalt (Co), % 0
18.5 to 21
Copper (Cu), % 1.0 to 1.6
0
Iron (Fe), % 0 to 0.3
24.3 to 36.2
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
2.5 to 3.5
Nickel (Ni), % 0
19 to 21
Niobium (Nb), % 0
0.75 to 1.3
Nitrogen (N), % 0
0 to 0.2
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
0.75 to 1.3
Titanium (Ti), % 0 to 0.1
0
Tungsten (W), % 0
2.0 to 3.0
Zinc (Zn), % 0 to 0.25
0
Zirconium (Zr), % 0.040 to 0.16
0
Residuals, % 0 to 0.15
0