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2117 Aluminum vs. R31538 Cobalt

2117 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 (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 2117 aluminum and the bottom bar is R31538 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 71
220
Elongation at Break, % 26
13 to 23
Fatigue Strength, MPa 95
310 to 480
Poisson's Ratio 0.33
0.29
Shear Modulus, GPa 27
86
Tensile Strength: Ultimate (UTS), MPa 300
1020 to 1360
Tensile Strength: Yield (Proof), MPa 170
580 to 930

Thermal Properties

Latent Heat of Fusion, J/g 400
320
Melting Completion (Liquidus), °C 650
1360
Melting Onset (Solidus), °C 550
1290
Specific Heat Capacity, J/kg-K 880
450
Thermal Conductivity, W/m-K 150
13
Thermal Expansion, µm/m-K 24
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 40
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 120
2.1

Otherwise Unclassified Properties

Density, g/cm3 3.0
8.4
Embodied Carbon, kg CO2/kg material 8.2
8.1
Embodied Energy, MJ/kg 150
110
Embodied Water, L/kg 1150
530

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 64
140 to 200
Resilience: Unit (Modulus of Resilience), kJ/m3 190
750 to 1920
Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 47
24
Strength to Weight: Axial, points 28
34 to 45
Strength to Weight: Bending, points 33
27 to 32
Thermal Diffusivity, mm2/s 59
3.5
Thermal Shock Resistance, points 12
25 to 33

Alloy Composition

Aluminum (Al), % 91 to 97.6
0
Carbon (C), % 0
0.15 to 0.35
Chromium (Cr), % 0 to 0.1
26 to 30
Cobalt (Co), % 0
58.7 to 68.9
Copper (Cu), % 2.2 to 4.5
0
Iron (Fe), % 0 to 0.7
0 to 0.75
Magnesium (Mg), % 0.2 to 1.0
0
Manganese (Mn), % 0.4 to 1.0
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), % 0.2 to 0.8
0 to 1.0
Titanium (Ti), % 0 to 0.25
0
Zinc (Zn), % 0 to 0.25
0
Zirconium (Zr), % 0 to 0.25
0
Residuals, % 0 to 0.15
0