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5251 Aluminum vs. R31539 Cobalt

5251 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 (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 R31539 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 68
220
Elongation at Break, % 2.0 to 19
13 to 22
Fatigue Strength, MPa 59 to 110
310 to 480
Poisson's Ratio 0.33
0.29
Shear Modulus, GPa 26
86
Tensile Strength: Ultimate (UTS), MPa 180 to 280
1000 to 1340
Tensile Strength: Yield (Proof), MPa 67 to 250
590 to 940

Thermal Properties

Latent Heat of Fusion, J/g 400
320
Melting Completion (Liquidus), °C 650
1360
Melting Onset (Solidus), °C 610
1290
Specific Heat Capacity, J/kg-K 900
450
Thermal Conductivity, W/m-K 150
13
Thermal Expansion, µm/m-K 24
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 37
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 120
2.1

Otherwise Unclassified Properties

Density, g/cm3 2.7
8.4
Embodied Carbon, kg CO2/kg material 8.5
8.2
Embodied Energy, MJ/kg 150
110
Embodied Water, L/kg 1180
530

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 5.4 to 27
140 to 190
Resilience: Unit (Modulus of Resilience), kJ/m3 33 to 450
780 to 2000
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 50
24
Strength to Weight: Axial, points 18 to 29
33 to 44
Strength to Weight: Bending, points 26 to 35
27 to 32
Thermal Diffusivity, mm2/s 61
3.5
Thermal Shock Resistance, points 7.9 to 13
24 to 32

Alloy Composition


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Aluminum (Al), % 95.5 to 98.2
0.3 to 1.0
Carbon (C), % 0
0 to 0.14
Chromium (Cr), % 0 to 0.15
26 to 30
Cobalt (Co), % 0
57.7 to 68.7
Copper (Cu), % 0 to 0.15
0
Iron (Fe), % 0 to 0.5
0 to 0.75
Lanthanum (La), % 0
0.030 to 0.2
Magnesium (Mg), % 1.7 to 2.4
0
Manganese (Mn), % 0.1 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), % 0 to 0.4
0 to 1.0
Titanium (Ti), % 0 to 0.15
0
Zinc (Zn), % 0 to 0.15
0
Residuals, % 0 to 0.15
0

Comparable Variants