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8090 Aluminum vs. R30008 Cobalt

8090 aluminum belongs to the aluminum alloys classification, while R30008 cobalt belongs to the cobalt alloys. There are 23 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 R30008 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 67
210
Elongation at Break, % 3.5 to 13
1.1 to 73
Fatigue Strength, MPa 91 to 140
320 to 530
Poisson's Ratio 0.33
0.29
Shear Modulus, GPa 25
83
Tensile Strength: Ultimate (UTS), MPa 340 to 490
950 to 1700
Tensile Strength: Yield (Proof), MPa 210 to 420
500 to 1080

Thermal Properties

Latent Heat of Fusion, J/g 400
320
Melting Completion (Liquidus), °C 660
1400
Melting Onset (Solidus), °C 600
1330
Specific Heat Capacity, J/kg-K 960
450
Thermal Expansion, µm/m-K 24
13

Otherwise Unclassified Properties

Base Metal Price, % relative 18
95
Density, g/cm3 2.7
8.4
Embodied Carbon, kg CO2/kg material 8.6
8.1
Embodied Energy, MJ/kg 170
110
Embodied Water, L/kg 1160
400

Common Calculations

Resilience: Unit (Modulus of Resilience), kJ/m3 340 to 1330
590 to 2720
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 50
24
Strength to Weight: Axial, points 34 to 49
31 to 56
Strength to Weight: Bending, points 39 to 50
25 to 37
Thermal Shock Resistance, points 15 to 22
25 to 44

Alloy Composition

Aluminum (Al), % 93 to 98.4
0
Boron (B), % 0
0 to 0.0010
Carbon (C), % 0
0 to 0.15
Chromium (Cr), % 0 to 0.1
18.5 to 21.5
Cobalt (Co), % 0
39 to 42
Copper (Cu), % 1.0 to 1.6
0
Iron (Fe), % 0 to 0.3
7.6 to 20
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
6.5 to 7.5
Nickel (Ni), % 0
15 to 18
Phosphorus (P), % 0
0 to 0.015
Silicon (Si), % 0 to 0.2
0 to 1.2
Sulfur (S), % 0
0 to 0.015
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