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5251 Aluminum vs. R30012 Cobalt

5251 aluminum belongs to the aluminum alloys classification, while R30012 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 5251 aluminum and the bottom bar is R30012 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 68
220
Elongation at Break, % 2.0 to 19
1.0
Fatigue Strength, MPa 59 to 110
320
Poisson's Ratio 0.33
0.28
Shear Modulus, GPa 26
86
Tensile Strength: Ultimate (UTS), MPa 180 to 280
830
Tensile Strength: Yield (Proof), MPa 67 to 250
650

Thermal Properties

Latent Heat of Fusion, J/g 400
320
Melting Completion (Liquidus), °C 650
1470
Melting Onset (Solidus), °C 610
1280
Specific Heat Capacity, J/kg-K 900
440
Thermal Conductivity, W/m-K 150
15
Thermal Expansion, µm/m-K 24
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 37
1.8
Electrical Conductivity: Equal Weight (Specific), % IACS 120
1.8

Otherwise Unclassified Properties

Density, g/cm3 2.7
8.8
Embodied Carbon, kg CO2/kg material 8.5
8.3
Embodied Energy, MJ/kg 150
120
Embodied Water, L/kg 1180
480

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 5.4 to 27
7.7
Resilience: Unit (Modulus of Resilience), kJ/m3 33 to 450
960
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 50
23
Strength to Weight: Axial, points 18 to 29
26
Strength to Weight: Bending, points 26 to 35
22
Thermal Diffusivity, mm2/s 61
3.8
Thermal Shock Resistance, points 7.9 to 13
23

Alloy Composition


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Aluminum (Al), % 95.5 to 98.2
0
Carbon (C), % 0
1.4 to 2.0
Chromium (Cr), % 0 to 0.15
27 to 32
Cobalt (Co), % 0
47.5 to 64.1
Copper (Cu), % 0 to 0.15
0
Iron (Fe), % 0 to 0.5
0 to 3.0
Magnesium (Mg), % 1.7 to 2.4
0
Manganese (Mn), % 0.1 to 0.5
0
Molybdenum (Mo), % 0
0 to 1.0
Nickel (Ni), % 0
0 to 3.0
Silicon (Si), % 0 to 0.4
0 to 2.0
Titanium (Ti), % 0 to 0.15
0
Tungsten (W), % 0
7.5 to 9.5
Zinc (Zn), % 0 to 0.15
0
Residuals, % 0 to 0.15
0