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4006 Aluminum vs. R30816 Cobalt

4006 aluminum belongs to the aluminum alloys classification, while R30816 cobalt belongs to the cobalt alloys. There are 26 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 4006 aluminum and the bottom bar is R30816 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 28 to 45
280
Elastic (Young's, Tensile) Modulus, GPa 69
210
Elongation at Break, % 3.4 to 24
23
Fatigue Strength, MPa 35 to 110
250
Poisson's Ratio 0.33
0.3
Shear Modulus, GPa 26
81
Tensile Strength: Ultimate (UTS), MPa 110 to 160
1020
Tensile Strength: Yield (Proof), MPa 62 to 140
460

Thermal Properties

Latent Heat of Fusion, J/g 410
300
Melting Completion (Liquidus), °C 640
1540
Melting Onset (Solidus), °C 620
1460
Specific Heat Capacity, J/kg-K 900
420
Thermal Conductivity, W/m-K 220
13
Thermal Expansion, µm/m-K 23
12

Otherwise Unclassified Properties

Density, g/cm3 2.7
9.1
Embodied Carbon, kg CO2/kg material 8.1
20
Embodied Energy, MJ/kg 150
320
Embodied Water, L/kg 1180
440

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 5.1 to 26
190
Resilience: Unit (Modulus of Resilience), kJ/m3 28 to 130
510
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 50
22
Strength to Weight: Axial, points 11 to 16
31
Strength to Weight: Bending, points 19 to 24
25
Thermal Diffusivity, mm2/s 89
3.3
Thermal Shock Resistance, points 4.9 to 7.0
28

Alloy Composition

Aluminum (Al), % 97.4 to 98.7
0
Carbon (C), % 0
0.32 to 0.42
Chromium (Cr), % 0 to 0.2
19 to 21
Cobalt (Co), % 0
40 to 49.8
Copper (Cu), % 0 to 0.1
0
Iron (Fe), % 0.5 to 0.8
0 to 5.0
Magnesium (Mg), % 0 to 0.010
0
Manganese (Mn), % 0 to 0.050
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), % 0.8 to 1.2
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 0.050
0
Residuals, % 0 to 0.15
0