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R30021 Cobalt vs. 5042 Aluminum

R30021 cobalt belongs to the cobalt alloys classification, while 5042 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 5042 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
68
Elongation at Break, % 9.0
1.1 to 3.4
Fatigue Strength, MPa 250
97 to 120
Poisson's Ratio 0.29
0.33
Shear Modulus, GPa 86
26
Tensile Strength: Ultimate (UTS), MPa 700
340 to 360
Tensile Strength: Yield (Proof), MPa 500
270 to 310

Thermal Properties

Latent Heat of Fusion, J/g 330
400
Melting Completion (Liquidus), °C 1350
640
Melting Onset (Solidus), °C 1190
570
Specific Heat Capacity, J/kg-K 450
900
Thermal Conductivity, W/m-K 15
130
Thermal Expansion, µm/m-K 11
24

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.9
33
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
110

Otherwise Unclassified Properties

Density, g/cm3 8.4
2.7
Embodied Carbon, kg CO2/kg material 8.0
8.8
Embodied Energy, MJ/kg 110
150
Embodied Water, L/kg 520
1180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 57
3.6 to 12
Resilience: Unit (Modulus of Resilience), kJ/m3 570
550 to 720
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 24
50
Strength to Weight: Axial, points 23
35 to 37
Strength to Weight: Bending, points 21
40 to 42
Thermal Diffusivity, mm2/s 3.8
53
Thermal Shock Resistance, points 21
15 to 16

Alloy Composition


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Aluminum (Al), % 0
94.2 to 96.8
Carbon (C), % 0.2 to 0.35
0
Chromium (Cr), % 26 to 29
0 to 0.1
Cobalt (Co), % 61.7 to 67.3
0
Copper (Cu), % 0
0 to 0.15
Iron (Fe), % 0 to 3.0
0 to 0.35
Magnesium (Mg), % 0
3.0 to 4.0
Manganese (Mn), % 0
0.2 to 0.5
Molybdenum (Mo), % 4.5 to 6.0
0
Nickel (Ni), % 2.0 to 3.0
0
Silicon (Si), % 0 to 1.5
0 to 0.2
Titanium (Ti), % 0
0 to 0.1
Zinc (Zn), % 0
0 to 0.25
Residuals, % 0
0 to 0.15