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5088 Aluminum vs. R31538 Cobalt

5088 aluminum belongs to the aluminum alloys classification, while R31538 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 5088 aluminum and the bottom bar is R31538 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 68
220
Elongation at Break, % 29
13 to 23
Fatigue Strength, MPa 180
310 to 480
Poisson's Ratio 0.33
0.29
Shear Modulus, GPa 25
86
Tensile Strength: Ultimate (UTS), MPa 310
1020 to 1360
Tensile Strength: Yield (Proof), MPa 150
580 to 930

Thermal Properties

Latent Heat of Fusion, J/g 390
320
Melting Completion (Liquidus), °C 640
1360
Melting Onset (Solidus), °C 540
1290
Specific Heat Capacity, J/kg-K 900
450
Thermal Conductivity, W/m-K 120
13
Thermal Expansion, µm/m-K 24
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 29
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 98
2.1

Otherwise Unclassified Properties

Density, g/cm3 2.7
8.4
Embodied Carbon, kg CO2/kg material 9.0
8.1
Embodied Energy, MJ/kg 150
110
Embodied Water, L/kg 1180
530

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 76
140 to 200
Resilience: Unit (Modulus of Resilience), kJ/m3 170
750 to 1920
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 50
24
Strength to Weight: Axial, points 32
34 to 45
Strength to Weight: Bending, points 38
27 to 32
Thermal Diffusivity, mm2/s 51
3.5
Thermal Shock Resistance, points 14
25 to 33

Alloy Composition

Aluminum (Al), % 92.4 to 94.8
0
Carbon (C), % 0
0.15 to 0.35
Chromium (Cr), % 0 to 0.15
26 to 30
Cobalt (Co), % 0
58.7 to 68.9
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 0.1 to 0.35
0 to 0.75
Magnesium (Mg), % 4.7 to 5.5
0
Manganese (Mn), % 0.2 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 0.2
0 to 1.0
Zinc (Zn), % 0.2 to 0.4
0
Zirconium (Zr), % 0 to 0.15
0
Residuals, % 0 to 0.15
0