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R31538 Cobalt vs. B390.0 Aluminum

R31538 cobalt belongs to the cobalt alloys classification, while B390.0 aluminum belongs to the aluminum alloys. There are 27 material properties with values for both materials. Properties with values for just one material (4, 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 R31538 cobalt and the bottom bar is B390.0 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
76
Elongation at Break, % 13 to 23
0.88
Fatigue Strength, MPa 310 to 480
170
Poisson's Ratio 0.29
0.33
Shear Modulus, GPa 86
29
Tensile Strength: Ultimate (UTS), MPa 1020 to 1360
320
Tensile Strength: Yield (Proof), MPa 580 to 930
250

Thermal Properties

Latent Heat of Fusion, J/g 320
640
Melting Completion (Liquidus), °C 1360
580
Melting Onset (Solidus), °C 1290
580
Specific Heat Capacity, J/kg-K 450
880
Thermal Conductivity, W/m-K 13
130
Thermal Expansion, µm/m-K 13
20

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
27
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
88

Otherwise Unclassified Properties

Density, g/cm3 8.4
2.8
Embodied Carbon, kg CO2/kg material 8.1
7.3
Embodied Energy, MJ/kg 110
130
Embodied Water, L/kg 530
940

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 200
2.6
Resilience: Unit (Modulus of Resilience), kJ/m3 750 to 1920
410
Stiffness to Weight: Axial, points 15
15
Stiffness to Weight: Bending, points 24
51
Strength to Weight: Axial, points 34 to 45
32
Strength to Weight: Bending, points 27 to 32
38
Thermal Diffusivity, mm2/s 3.5
55
Thermal Shock Resistance, points 25 to 33
15

Alloy Composition


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Aluminum (Al), % 0
72.7 to 79.6
Carbon (C), % 0.15 to 0.35
0
Chromium (Cr), % 26 to 30
0
Cobalt (Co), % 58.7 to 68.9
0
Copper (Cu), % 0
4.0 to 5.0
Iron (Fe), % 0 to 0.75
0 to 1.3
Magnesium (Mg), % 0
0.45 to 0.65
Manganese (Mn), % 0 to 1.0
0 to 0.5
Molybdenum (Mo), % 5.0 to 7.0
0
Nickel (Ni), % 0 to 1.0
0 to 0.1
Nitrogen (N), % 0 to 0.25
0
Silicon (Si), % 0 to 1.0
16 to 18
Titanium (Ti), % 0
0 to 0.1
Zinc (Zn), % 0
0 to 1.5
Residuals, % 0
0 to 0.2