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308.0 Aluminum vs. R31539 Cobalt

308.0 aluminum belongs to the aluminum alloys classification, while R31539 cobalt belongs to the cobalt alloys. There are 27 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 308.0 aluminum and the bottom bar is R31539 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 73
220
Elongation at Break, % 2.0
13 to 22
Fatigue Strength, MPa 89
310 to 480
Poisson's Ratio 0.33
0.29
Shear Modulus, GPa 27
86
Tensile Strength: Ultimate (UTS), MPa 190
1000 to 1340
Tensile Strength: Yield (Proof), MPa 110
590 to 940

Thermal Properties

Latent Heat of Fusion, J/g 470
320
Melting Completion (Liquidus), °C 620
1360
Melting Onset (Solidus), °C 540
1290
Specific Heat Capacity, J/kg-K 870
450
Thermal Conductivity, W/m-K 140
13
Thermal Expansion, µm/m-K 20
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 37
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 110
2.1

Otherwise Unclassified Properties

Density, g/cm3 2.9
8.4
Embodied Carbon, kg CO2/kg material 7.7
8.2
Embodied Energy, MJ/kg 140
110
Embodied Water, L/kg 1080
530

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 3.3
140 to 190
Resilience: Unit (Modulus of Resilience), kJ/m3 83
780 to 2000
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 47
24
Strength to Weight: Axial, points 18
33 to 44
Strength to Weight: Bending, points 25
27 to 32
Thermal Diffusivity, mm2/s 55
3.5
Thermal Shock Resistance, points 9.2
24 to 32

Alloy Composition

Aluminum (Al), % 85.7 to 91
0.3 to 1.0
Carbon (C), % 0
0 to 0.14
Chromium (Cr), % 0
26 to 30
Cobalt (Co), % 0
57.7 to 68.7
Copper (Cu), % 4.0 to 5.0
0
Iron (Fe), % 0 to 1.0
0 to 0.75
Lanthanum (La), % 0
0.030 to 0.2
Magnesium (Mg), % 0 to 0.1
0
Manganese (Mn), % 0 to 0.5
0 to 1.0
Molybdenum (Mo), % 0
5.0 to 7.0
Nickel (Ni), % 0
0 to 1.0
Nitrogen (N), % 0
0 to 0.25
Silicon (Si), % 5.0 to 6.0
0 to 1.0
Titanium (Ti), % 0 to 0.25
0
Zinc (Zn), % 0 to 1.0
0
Residuals, % 0 to 0.5
0