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EN AC-44000 Aluminum vs. R31539 Cobalt

EN AC-44000 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 (5, 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 EN AC-44000 aluminum and the bottom bar is R31539 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 71
220
Elongation at Break, % 7.3
13 to 22
Fatigue Strength, MPa 64
310 to 480
Poisson's Ratio 0.33
0.29
Shear Modulus, GPa 27
86
Tensile Strength: Ultimate (UTS), MPa 180
1000 to 1340
Tensile Strength: Yield (Proof), MPa 86
590 to 940

Thermal Properties

Latent Heat of Fusion, J/g 560
320
Melting Completion (Liquidus), °C 590
1360
Melting Onset (Solidus), °C 590
1290
Specific Heat Capacity, J/kg-K 910
450
Thermal Conductivity, W/m-K 140
13
Thermal Expansion, µm/m-K 21
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 36
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 130
2.1

Otherwise Unclassified Properties

Density, g/cm3 2.5
8.4
Embodied Carbon, kg CO2/kg material 7.8
8.2
Embodied Energy, MJ/kg 150
110
Embodied Water, L/kg 1070
530

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 11
140 to 190
Resilience: Unit (Modulus of Resilience), kJ/m3 51
780 to 2000
Stiffness to Weight: Axial, points 16
15
Stiffness to Weight: Bending, points 55
24
Strength to Weight: Axial, points 20
33 to 44
Strength to Weight: Bending, points 28
27 to 32
Thermal Diffusivity, mm2/s 61
3.5
Thermal Shock Resistance, points 8.4
24 to 32

Alloy Composition


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Aluminum (Al), % 87.1 to 90
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), % 0 to 0.050
0
Iron (Fe), % 0 to 0.19
0 to 0.75
Lanthanum (La), % 0
0.030 to 0.2
Magnesium (Mg), % 0 to 0.45
0
Manganese (Mn), % 0 to 0.1
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), % 10 to 11.8
0 to 1.0
Titanium (Ti), % 0 to 0.15
0
Zinc (Zn), % 0 to 0.070
0
Residuals, % 0 to 0.1
0