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5021 Aluminum vs. R30816 Cobalt

5021 aluminum belongs to the aluminum alloys classification, while R30816 cobalt belongs to the cobalt alloys. There are 25 material properties with values for both materials. Properties with values for just one material (7, 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 5021 aluminum and the bottom bar is R30816 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 68
210
Elongation at Break, % 1.1 to 3.4
23
Fatigue Strength, MPa 85 to 110
250
Poisson's Ratio 0.33
0.3
Shear Modulus, GPa 26
81
Tensile Strength: Ultimate (UTS), MPa 300 to 310
1020
Tensile Strength: Yield (Proof), MPa 240 to 270
460

Thermal Properties

Latent Heat of Fusion, J/g 400
300
Melting Completion (Liquidus), °C 640
1540
Melting Onset (Solidus), °C 590
1460
Specific Heat Capacity, J/kg-K 900
420
Thermal Conductivity, W/m-K 140
13
Thermal Expansion, µm/m-K 23
12

Otherwise Unclassified Properties

Density, g/cm3 2.7
9.1
Embodied Carbon, kg CO2/kg material 8.6
20
Embodied Energy, MJ/kg 150
320
Embodied Water, L/kg 1180
440

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 3.1 to 10
190
Resilience: Unit (Modulus of Resilience), kJ/m3 440 to 550
510
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 50
22
Strength to Weight: Axial, points 30 to 32
31
Strength to Weight: Bending, points 37
25
Thermal Diffusivity, mm2/s 57
3.3
Thermal Shock Resistance, points 13 to 14
28

Alloy Composition

Aluminum (Al), % 95.2 to 97.7
0
Carbon (C), % 0
0.32 to 0.42
Chromium (Cr), % 0 to 0.15
19 to 21
Cobalt (Co), % 0
40 to 49.8
Copper (Cu), % 0 to 0.15
0
Iron (Fe), % 0 to 0.5
0 to 5.0
Magnesium (Mg), % 2.2 to 2.8
0
Manganese (Mn), % 0.1 to 0.5
1.0 to 2.0
Molybdenum (Mo), % 0
3.5 to 4.5
Nickel (Ni), % 0
19 to 21
Niobium (Nb), % 0
3.5 to 4.5
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 0.4
0 to 1.0
Sulfur (S), % 0
0 to 0.030
Tantalum (Ta), % 0
3.5 to 4.5
Tungsten (W), % 0
3.5 to 4.5
Zinc (Zn), % 0 to 0.15
0
Residuals, % 0 to 0.15
0