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R31537 Cobalt vs. 6151 Aluminum

R31537 cobalt belongs to the cobalt alloys classification, while 6151 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 R31537 cobalt and the bottom bar is 6151 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
69
Elongation at Break, % 14 to 23
1.1 to 5.7
Fatigue Strength, MPa 310 to 480
80 to 100
Poisson's Ratio 0.29
0.33
Shear Modulus, GPa 87
26
Tensile Strength: Ultimate (UTS), MPa 1000 to 1340
330 to 340
Tensile Strength: Yield (Proof), MPa 590 to 940
270 to 280

Thermal Properties

Latent Heat of Fusion, J/g 320
410
Melting Completion (Liquidus), °C 1360
650
Melting Onset (Solidus), °C 1290
590
Specific Heat Capacity, J/kg-K 450
900
Thermal Conductivity, W/m-K 13
170
Thermal Expansion, µm/m-K 13
23

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
45
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
150

Otherwise Unclassified Properties

Density, g/cm3 8.4
2.7
Embodied Carbon, kg CO2/kg material 8.1
8.2
Embodied Energy, MJ/kg 110
150
Embodied Water, L/kg 530
1180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 200
3.5 to 18
Resilience: Unit (Modulus of Resilience), kJ/m3 780 to 1990
520 to 580
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 24
50
Strength to Weight: Axial, points 33 to 44
34
Strength to Weight: Bending, points 26 to 32
39
Thermal Diffusivity, mm2/s 3.4
70
Thermal Shock Resistance, points 24 to 32
15

Alloy Composition

Aluminum (Al), % 0
95.6 to 98.8
Carbon (C), % 0 to 0.14
0
Chromium (Cr), % 26 to 30
0.15 to 0.35
Cobalt (Co), % 58.9 to 69
0
Copper (Cu), % 0
0 to 0.35
Iron (Fe), % 0 to 0.75
0 to 1.0
Magnesium (Mg), % 0
0.45 to 0.8
Manganese (Mn), % 0 to 1.0
0 to 0.2
Molybdenum (Mo), % 5.0 to 7.0
0
Nickel (Ni), % 0 to 1.0
0
Nitrogen (N), % 0 to 0.25
0
Silicon (Si), % 0 to 1.0
0.6 to 1.2
Titanium (Ti), % 0
0 to 0.15
Zinc (Zn), % 0
0 to 0.25
Residuals, % 0
0 to 0.15