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7021 Aluminum vs. R30605 Cobalt

7021 aluminum belongs to the aluminum alloys classification, while R30605 cobalt belongs to the cobalt alloys. There are 25 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 7021 aluminum and the bottom bar is R30605 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 69
210
Elongation at Break, % 9.4
34
Fatigue Strength, MPa 150
260 to 590
Poisson's Ratio 0.32
0.29
Shear Modulus, GPa 26
81
Tensile Strength: Ultimate (UTS), MPa 460
1130 to 1900
Tensile Strength: Yield (Proof), MPa 390
470 to 1600

Thermal Properties

Latent Heat of Fusion, J/g 380
290
Melting Completion (Liquidus), °C 630
1410
Melting Onset (Solidus), °C 510
1330
Specific Heat Capacity, J/kg-K 870
410
Thermal Conductivity, W/m-K 150
9.6
Thermal Expansion, µm/m-K 24
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 38
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 120
1.8

Otherwise Unclassified Properties

Density, g/cm3 2.9
9.6
Embodied Carbon, kg CO2/kg material 8.3
9.8
Embodied Energy, MJ/kg 150
140
Embodied Water, L/kg 1140
450

Common Calculations

Stiffness to Weight: Axial, points 13
12
Stiffness to Weight: Bending, points 47
21
Strength to Weight: Axial, points 44
33 to 55
Strength to Weight: Bending, points 45
25 to 36
Thermal Diffusivity, mm2/s 59
2.5
Thermal Shock Resistance, points 20
31 to 52

Alloy Composition


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Aluminum (Al), % 90.7 to 93.7
0
Carbon (C), % 0
0.050 to 0.15
Chromium (Cr), % 0 to 0.050
19 to 21
Cobalt (Co), % 0
46.4 to 57
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 0 to 0.4
0 to 3.0
Magnesium (Mg), % 1.2 to 1.8
0
Manganese (Mn), % 0 to 0.1
1.0 to 2.0
Nickel (Ni), % 0
9.0 to 11
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 0.25
0 to 0.4
Sulfur (S), % 0
0 to 0.030
Titanium (Ti), % 0 to 0.1
0
Tungsten (W), % 0
14 to 16
Zinc (Zn), % 5.0 to 6.0
0
Zirconium (Zr), % 0.080 to 0.18
0
Residuals, % 0 to 0.15
0