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7021 Aluminum vs. R30008 Cobalt

7021 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 7021 aluminum and the bottom bar is R30008 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

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

Thermal Properties

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

Otherwise Unclassified Properties

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

Common Calculations

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

Alloy Composition

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