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R31539 Cobalt vs. C71640 Copper-nickel

R31539 cobalt belongs to the cobalt alloys classification, while C71640 copper-nickel belongs to the copper alloys. There are 24 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.

For each property being compared, the top bar is R31539 cobalt and the bottom bar is C71640 copper-nickel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
140
Poisson's Ratio 0.29
0.33
Shear Modulus, GPa 86
52
Tensile Strength: Ultimate (UTS), MPa 1000 to 1340
490 to 630
Tensile Strength: Yield (Proof), MPa 590 to 940
190 to 460

Thermal Properties

Latent Heat of Fusion, J/g 320
240
Melting Completion (Liquidus), °C 1360
1180
Melting Onset (Solidus), °C 1290
1120
Specific Heat Capacity, J/kg-K 450
410
Thermal Conductivity, W/m-K 13
29
Thermal Expansion, µm/m-K 13
15

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
7.0
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
7.1

Otherwise Unclassified Properties

Density, g/cm3 8.4
8.9
Embodied Carbon, kg CO2/kg material 8.2
5.0
Embodied Energy, MJ/kg 110
73
Embodied Water, L/kg 530
280

Common Calculations

Resilience: Unit (Modulus of Resilience), kJ/m3 780 to 2000
130 to 750
Stiffness to Weight: Axial, points 15
8.7
Stiffness to Weight: Bending, points 24
20
Strength to Weight: Axial, points 33 to 44
15 to 20
Strength to Weight: Bending, points 27 to 32
16 to 18
Thermal Diffusivity, mm2/s 3.5
8.2
Thermal Shock Resistance, points 24 to 32
16 to 21

Alloy Composition


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Aluminum (Al), % 0.3 to 1.0
0
Carbon (C), % 0 to 0.14
0
Chromium (Cr), % 26 to 30
0
Cobalt (Co), % 57.7 to 68.7
0
Copper (Cu), % 0
61.7 to 67.8
Iron (Fe), % 0 to 0.75
1.7 to 2.3
Lanthanum (La), % 0.030 to 0.2
0
Lead (Pb), % 0
0 to 0.050
Manganese (Mn), % 0 to 1.0
1.5 to 2.5
Molybdenum (Mo), % 5.0 to 7.0
0
Nickel (Ni), % 0 to 1.0
29 to 32
Nitrogen (N), % 0 to 0.25
0
Silicon (Si), % 0 to 1.0
0
Zinc (Zn), % 0
0 to 1.0
Residuals, % 0
0 to 0.5