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204.0 Aluminum vs. R30021 Cobalt

204.0 aluminum belongs to the aluminum alloys classification, while R30021 cobalt belongs to the cobalt 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 204.0 aluminum and the bottom bar is R30021 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 71
220
Elongation at Break, % 5.7 to 7.8
9.0
Fatigue Strength, MPa 63 to 77
250
Poisson's Ratio 0.33
0.29
Shear Modulus, GPa 27
86
Tensile Strength: Ultimate (UTS), MPa 230 to 340
700
Tensile Strength: Yield (Proof), MPa 180 to 220
500

Thermal Properties

Latent Heat of Fusion, J/g 390
330
Melting Completion (Liquidus), °C 650
1350
Melting Onset (Solidus), °C 580
1190
Specific Heat Capacity, J/kg-K 880
450
Thermal Conductivity, W/m-K 120
15
Thermal Expansion, µm/m-K 19
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 29 to 34
1.9
Electrical Conductivity: Equal Weight (Specific), % IACS 87 to 100
2.1

Otherwise Unclassified Properties

Density, g/cm3 3.0
8.4
Embodied Carbon, kg CO2/kg material 8.0
8.0
Embodied Energy, MJ/kg 150
110
Embodied Water, L/kg 1150
520

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 12 to 23
57
Resilience: Unit (Modulus of Resilience), kJ/m3 220 to 350
570
Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 46
24
Strength to Weight: Axial, points 21 to 31
23
Strength to Weight: Bending, points 28 to 36
21
Thermal Diffusivity, mm2/s 46
3.8
Thermal Shock Resistance, points 12 to 18
21

Alloy Composition


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Aluminum (Al), % 93.4 to 95.5
0
Carbon (C), % 0
0.2 to 0.35
Chromium (Cr), % 0
26 to 29
Cobalt (Co), % 0
61.7 to 67.3
Copper (Cu), % 4.2 to 5.0
0
Iron (Fe), % 0 to 0.35
0 to 3.0
Magnesium (Mg), % 0.15 to 0.35
0
Manganese (Mn), % 0 to 0.1
0
Molybdenum (Mo), % 0
4.5 to 6.0
Nickel (Ni), % 0 to 0.050
2.0 to 3.0
Silicon (Si), % 0 to 0.2
0 to 1.5
Tin (Sn), % 0 to 0.050
0
Titanium (Ti), % 0.15 to 0.3
0
Zinc (Zn), % 0 to 0.1
0
Residuals, % 0 to 0.15
0