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R30021 Cobalt vs. A384.0 Aluminum

R30021 cobalt belongs to the cobalt alloys classification, while A384.0 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 A384.0 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
74
Elongation at Break, % 9.0
2.5
Fatigue Strength, MPa 250
140
Poisson's Ratio 0.29
0.33
Shear Modulus, GPa 86
28
Tensile Strength: Ultimate (UTS), MPa 700
330
Tensile Strength: Yield (Proof), MPa 500
170

Thermal Properties

Latent Heat of Fusion, J/g 330
550
Melting Completion (Liquidus), °C 1350
610
Melting Onset (Solidus), °C 1190
510
Specific Heat Capacity, J/kg-K 450
880
Thermal Conductivity, W/m-K 15
96
Thermal Expansion, µm/m-K 11
21

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.9
23
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
73

Otherwise Unclassified Properties

Density, g/cm3 8.4
2.8
Embodied Carbon, kg CO2/kg material 8.0
7.5
Embodied Energy, MJ/kg 110
140
Embodied Water, L/kg 520
1010

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 57
6.9
Resilience: Unit (Modulus of Resilience), kJ/m3 570
180
Stiffness to Weight: Axial, points 15
15
Stiffness to Weight: Bending, points 24
50
Strength to Weight: Axial, points 23
32
Strength to Weight: Bending, points 21
38
Thermal Diffusivity, mm2/s 3.8
39
Thermal Shock Resistance, points 21
15

Alloy Composition


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Aluminum (Al), % 0
79.3 to 86.5
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
3.0 to 4.5
Iron (Fe), % 0 to 3.0
0 to 1.3
Magnesium (Mg), % 0
0 to 0.1
Manganese (Mn), % 0
0 to 0.5
Molybdenum (Mo), % 4.5 to 6.0
0
Nickel (Ni), % 2.0 to 3.0
0 to 0.5
Silicon (Si), % 0 to 1.5
10.5 to 12
Tin (Sn), % 0
0 to 0.35
Zinc (Zn), % 0
0 to 1.0
Residuals, % 0
0 to 0.5