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R30021 Cobalt vs. 5657 Aluminum

R30021 cobalt belongs to the cobalt alloys classification, while 5657 aluminum belongs to the aluminum alloys. There are 27 material properties with values for both materials. Properties with values for just one material (6, 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 5657 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
68
Elongation at Break, % 9.0
6.6 to 15
Fatigue Strength, MPa 250
74 to 88
Poisson's Ratio 0.29
0.33
Shear Modulus, GPa 86
26
Tensile Strength: Ultimate (UTS), MPa 700
150 to 200
Tensile Strength: Yield (Proof), MPa 500
140 to 170

Thermal Properties

Latent Heat of Fusion, J/g 330
400
Melting Completion (Liquidus), °C 1350
660
Melting Onset (Solidus), °C 1190
640
Specific Heat Capacity, J/kg-K 450
900
Thermal Conductivity, W/m-K 15
210
Thermal Expansion, µm/m-K 11
24

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.9
54
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
180

Otherwise Unclassified Properties

Density, g/cm3 8.4
2.7
Embodied Carbon, kg CO2/kg material 8.0
8.4
Embodied Energy, MJ/kg 110
160
Embodied Water, L/kg 520
1200

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 57
9.7 to 27
Resilience: Unit (Modulus of Resilience), kJ/m3 570
140 to 200
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 24
50
Strength to Weight: Axial, points 23
15 to 20
Strength to Weight: Bending, points 21
23 to 28
Thermal Diffusivity, mm2/s 3.8
84
Thermal Shock Resistance, points 21
6.7 to 8.6

Alloy Composition


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Aluminum (Al), % 0
98.5 to 99.4
Carbon (C), % 0.2 to 0.35
0
Chromium (Cr), % 26 to 29
0
Cobalt (Co), % 61.7 to 67.3
0
Copper (Cu), % 0
0 to 0.1
Gallium (Ga), % 0
0 to 0.030
Iron (Fe), % 0 to 3.0
0 to 0.1
Magnesium (Mg), % 0
0.6 to 1.0
Manganese (Mn), % 0
0 to 0.030
Molybdenum (Mo), % 4.5 to 6.0
0
Nickel (Ni), % 2.0 to 3.0
0
Silicon (Si), % 0 to 1.5
0 to 0.080
Vanadium (V), % 0
0 to 0.050
Zinc (Zn), % 0
0 to 0.050
Residuals, % 0
0 to 0.050