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R30021 Cobalt vs. 7022 Aluminum

R30021 cobalt belongs to the cobalt alloys classification, while 7022 aluminum belongs to the aluminum alloys. There are 27 material properties with values for both materials. Properties with values for just one material (5, 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 R30021 cobalt and the bottom bar is 7022 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
70
Elongation at Break, % 9.0
6.3 to 8.0
Fatigue Strength, MPa 250
140 to 170
Poisson's Ratio 0.29
0.32
Shear Modulus, GPa 86
26
Tensile Strength: Ultimate (UTS), MPa 700
490 to 540
Tensile Strength: Yield (Proof), MPa 500
390 to 460

Thermal Properties

Latent Heat of Fusion, J/g 330
380
Melting Completion (Liquidus), °C 1350
640
Melting Onset (Solidus), °C 1190
480
Specific Heat Capacity, J/kg-K 450
870
Thermal Conductivity, W/m-K 15
140
Thermal Expansion, µm/m-K 11
24

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.9
21
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
65

Otherwise Unclassified Properties

Density, g/cm3 8.4
2.9
Embodied Carbon, kg CO2/kg material 8.0
8.5
Embodied Energy, MJ/kg 110
150
Embodied Water, L/kg 520
1130

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 57
29 to 40
Resilience: Unit (Modulus of Resilience), kJ/m3 570
1100 to 1500
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 24
47
Strength to Weight: Axial, points 23
47 to 51
Strength to Weight: Bending, points 21
47 to 50
Thermal Diffusivity, mm2/s 3.8
54
Thermal Shock Resistance, points 21
21 to 23

Alloy Composition


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Aluminum (Al), % 0
87.9 to 92.4
Carbon (C), % 0.2 to 0.35
0
Chromium (Cr), % 26 to 29
0.1 to 0.3
Cobalt (Co), % 61.7 to 67.3
0
Copper (Cu), % 0
0.5 to 1.0
Iron (Fe), % 0 to 3.0
0 to 0.5
Magnesium (Mg), % 0
2.6 to 3.7
Manganese (Mn), % 0
0.1 to 0.4
Molybdenum (Mo), % 4.5 to 6.0
0
Nickel (Ni), % 2.0 to 3.0
0
Silicon (Si), % 0 to 1.5
0 to 0.5
Titanium (Ti), % 0
0 to 0.2
Zinc (Zn), % 0
4.3 to 5.2
Zirconium (Zr), % 0
0 to 0.2
Residuals, % 0
0 to 0.15