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R30008 Cobalt vs. 5021 Aluminum

R30008 cobalt belongs to the cobalt alloys classification, while 5021 aluminum belongs to the aluminum 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 R30008 cobalt and the bottom bar is 5021 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
68
Elongation at Break, % 1.1 to 73
1.1 to 3.4
Fatigue Strength, MPa 320 to 530
85 to 110
Poisson's Ratio 0.29
0.33
Shear Modulus, GPa 83
26
Tensile Strength: Ultimate (UTS), MPa 950 to 1700
300 to 310
Tensile Strength: Yield (Proof), MPa 500 to 1080
240 to 270

Thermal Properties

Latent Heat of Fusion, J/g 320
400
Melting Completion (Liquidus), °C 1400
640
Melting Onset (Solidus), °C 1330
590
Specific Heat Capacity, J/kg-K 450
900
Thermal Expansion, µm/m-K 13
23

Otherwise Unclassified Properties

Base Metal Price, % relative 95
9.5
Density, g/cm3 8.4
2.7
Embodied Carbon, kg CO2/kg material 8.1
8.6
Embodied Energy, MJ/kg 110
150
Embodied Water, L/kg 400
1180

Common Calculations

Resilience: Unit (Modulus of Resilience), kJ/m3 590 to 2720
440 to 550
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
50
Strength to Weight: Axial, points 31 to 56
30 to 32
Strength to Weight: Bending, points 25 to 37
37
Thermal Shock Resistance, points 25 to 44
13 to 14

Alloy Composition

Aluminum (Al), % 0
95.2 to 97.7
Boron (B), % 0 to 0.0010
0
Carbon (C), % 0 to 0.15
0
Chromium (Cr), % 18.5 to 21.5
0 to 0.15
Cobalt (Co), % 39 to 42
0
Copper (Cu), % 0
0 to 0.15
Iron (Fe), % 7.6 to 20
0 to 0.5
Magnesium (Mg), % 0
2.2 to 2.8
Manganese (Mn), % 1.0 to 2.0
0.1 to 0.5
Molybdenum (Mo), % 6.5 to 7.5
0
Nickel (Ni), % 15 to 18
0
Phosphorus (P), % 0 to 0.015
0
Silicon (Si), % 0 to 1.2
0 to 0.4
Sulfur (S), % 0 to 0.015
0
Zinc (Zn), % 0
0 to 0.15
Residuals, % 0
0 to 0.15