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5252 Aluminum vs. R30021 Cobalt

5252 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 5252 aluminum and the bottom bar is R30021 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 68
220
Elongation at Break, % 4.5 to 11
9.0
Fatigue Strength, MPa 100 to 110
250
Poisson's Ratio 0.33
0.29
Shear Modulus, GPa 25
86
Tensile Strength: Ultimate (UTS), MPa 230 to 290
700
Tensile Strength: Yield (Proof), MPa 170 to 240
500

Thermal Properties

Latent Heat of Fusion, J/g 400
330
Melting Completion (Liquidus), °C 650
1350
Melting Onset (Solidus), °C 610
1190
Specific Heat Capacity, J/kg-K 910
450
Thermal Conductivity, W/m-K 140
15
Thermal Expansion, µm/m-K 24
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 34
1.9
Electrical Conductivity: Equal Weight (Specific), % IACS 120
2.1

Otherwise Unclassified Properties

Density, g/cm3 2.7
8.4
Embodied Carbon, kg CO2/kg material 8.7
8.0
Embodied Energy, MJ/kg 160
110
Embodied Water, L/kg 1190
520

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 12 to 23
57
Resilience: Unit (Modulus of Resilience), kJ/m3 210 to 430
570
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 51
24
Strength to Weight: Axial, points 23 to 30
23
Strength to Weight: Bending, points 31 to 36
21
Thermal Diffusivity, mm2/s 57
3.8
Thermal Shock Resistance, points 10 to 13
21

Alloy Composition


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Aluminum (Al), % 96.6 to 97.8
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), % 0 to 0.1
0
Iron (Fe), % 0 to 0.1
0 to 3.0
Magnesium (Mg), % 2.2 to 2.8
0
Manganese (Mn), % 0 to 0.1
0
Molybdenum (Mo), % 0
4.5 to 6.0
Nickel (Ni), % 0
2.0 to 3.0
Silicon (Si), % 0 to 0.080
0 to 1.5
Vanadium (V), % 0 to 0.050
0
Zinc (Zn), % 0 to 0.050
0
Residuals, % 0 to 0.1
0