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R31538 Cobalt vs. EN AC-46400 Aluminum

R31538 cobalt belongs to the cobalt alloys classification, while EN AC-46400 aluminum belongs to the aluminum 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 R31538 cobalt and the bottom bar is EN AC-46400 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
72
Elongation at Break, % 13 to 23
1.1 to 1.7
Fatigue Strength, MPa 310 to 480
75 to 85
Poisson's Ratio 0.29
0.33
Shear Modulus, GPa 86
27
Tensile Strength: Ultimate (UTS), MPa 1020 to 1360
170 to 310
Tensile Strength: Yield (Proof), MPa 580 to 930
110 to 270

Thermal Properties

Latent Heat of Fusion, J/g 320
520
Melting Completion (Liquidus), °C 1360
610
Melting Onset (Solidus), °C 1290
570
Specific Heat Capacity, J/kg-K 450
890
Thermal Conductivity, W/m-K 13
130
Thermal Expansion, µm/m-K 13
22

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
33
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
110

Otherwise Unclassified Properties

Density, g/cm3 8.4
2.7
Embodied Carbon, kg CO2/kg material 8.1
7.8
Embodied Energy, MJ/kg 110
150
Embodied Water, L/kg 530
1070

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 200
1.7 to 4.9
Resilience: Unit (Modulus of Resilience), kJ/m3 750 to 1920
82 to 500
Stiffness to Weight: Axial, points 15
15
Stiffness to Weight: Bending, points 24
52
Strength to Weight: Axial, points 34 to 45
18 to 32
Strength to Weight: Bending, points 27 to 32
26 to 38
Thermal Diffusivity, mm2/s 3.5
55
Thermal Shock Resistance, points 25 to 33
7.8 to 14

Alloy Composition


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Aluminum (Al), % 0
85.4 to 90.5
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
0.8 to 1.3
Iron (Fe), % 0 to 0.75
0 to 0.8
Lead (Pb), % 0
0 to 0.1
Magnesium (Mg), % 0
0.25 to 0.65
Manganese (Mn), % 0 to 1.0
0.15 to 0.55
Molybdenum (Mo), % 5.0 to 7.0
0
Nickel (Ni), % 0 to 1.0
0 to 0.2
Nitrogen (N), % 0 to 0.25
0
Silicon (Si), % 0 to 1.0
8.3 to 9.7
Tin (Sn), % 0
0 to 0.1
Titanium (Ti), % 0
0 to 0.2
Zinc (Zn), % 0
0 to 0.8
Residuals, % 0
0 to 0.25