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R30008 Cobalt vs. 7021 Aluminum

R30008 cobalt belongs to the cobalt alloys classification, while 7021 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 7021 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
69
Elongation at Break, % 1.1 to 73
9.4
Fatigue Strength, MPa 320 to 530
150
Poisson's Ratio 0.29
0.32
Shear Modulus, GPa 83
26
Tensile Strength: Ultimate (UTS), MPa 950 to 1700
460
Tensile Strength: Yield (Proof), MPa 500 to 1080
390

Thermal Properties

Latent Heat of Fusion, J/g 320
380
Melting Completion (Liquidus), °C 1400
630
Melting Onset (Solidus), °C 1330
510
Specific Heat Capacity, J/kg-K 450
870
Thermal Expansion, µm/m-K 13
24

Otherwise Unclassified Properties

Base Metal Price, % relative 95
9.5
Density, g/cm3 8.4
2.9
Embodied Carbon, kg CO2/kg material 8.1
8.3
Embodied Energy, MJ/kg 110
150
Embodied Water, L/kg 400
1140

Common Calculations

Resilience: Unit (Modulus of Resilience), kJ/m3 590 to 2720
1110
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 24
47
Strength to Weight: Axial, points 31 to 56
44
Strength to Weight: Bending, points 25 to 37
45
Thermal Shock Resistance, points 25 to 44
20

Alloy Composition

Aluminum (Al), % 0
90.7 to 93.7
Boron (B), % 0 to 0.0010
0
Carbon (C), % 0 to 0.15
0
Chromium (Cr), % 18.5 to 21.5
0 to 0.050
Cobalt (Co), % 39 to 42
0
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 7.6 to 20
0 to 0.4
Magnesium (Mg), % 0
1.2 to 1.8
Manganese (Mn), % 1.0 to 2.0
0 to 0.1
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 0.25
Sulfur (S), % 0 to 0.015
0
Titanium (Ti), % 0
0 to 0.1
Zinc (Zn), % 0
5.0 to 6.0
Zirconium (Zr), % 0
0.080 to 0.18
Residuals, % 0
0 to 0.15