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C18400 Copper vs. R31538 Cobalt

C18400 copper belongs to the copper alloys classification, while R31538 cobalt belongs to the cobalt alloys. There are 26 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 C18400 copper and the bottom bar is R31538 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 120
220
Elongation at Break, % 13 to 50
13 to 23
Poisson's Ratio 0.34
0.29
Shear Modulus, GPa 44
86
Tensile Strength: Ultimate (UTS), MPa 270 to 490
1020 to 1360
Tensile Strength: Yield (Proof), MPa 110 to 480
580 to 930

Thermal Properties

Latent Heat of Fusion, J/g 210
320
Melting Completion (Liquidus), °C 1080
1360
Melting Onset (Solidus), °C 1070
1290
Specific Heat Capacity, J/kg-K 390
450
Thermal Conductivity, W/m-K 320
13
Thermal Expansion, µm/m-K 17
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 80
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 81
2.1

Otherwise Unclassified Properties

Density, g/cm3 8.9
8.4
Embodied Carbon, kg CO2/kg material 2.6
8.1
Embodied Energy, MJ/kg 41
110
Embodied Water, L/kg 310
530

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 63 to 120
140 to 200
Resilience: Unit (Modulus of Resilience), kJ/m3 54 to 980
750 to 1920
Stiffness to Weight: Axial, points 7.3
15
Stiffness to Weight: Bending, points 18
24
Strength to Weight: Axial, points 8.5 to 15
34 to 45
Strength to Weight: Bending, points 10 to 16
27 to 32
Thermal Diffusivity, mm2/s 94
3.5
Thermal Shock Resistance, points 9.6 to 17
25 to 33

Alloy Composition

Arsenic (As), % 0 to 0.0050
0
Calcium (Ca), % 0 to 0.0050
0
Carbon (C), % 0
0.15 to 0.35
Chromium (Cr), % 0.4 to 1.2
26 to 30
Cobalt (Co), % 0
58.7 to 68.9
Copper (Cu), % 97.2 to 99.6
0
Iron (Fe), % 0 to 0.15
0 to 0.75
Lithium (Li), % 0 to 0.050
0
Manganese (Mn), % 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
Phosphorus (P), % 0 to 0.050
0
Silicon (Si), % 0 to 0.1
0 to 1.0
Zinc (Zn), % 0 to 0.7
0
Residuals, % 0 to 0.5
0