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CR012A Copper vs. R30021 Cobalt

CR012A copper belongs to the copper alloys classification, while R30021 cobalt belongs to the cobalt alloys. There are 26 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.

For each property being compared, the top bar is CR012A copper and the bottom bar is R30021 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 120
220
Elongation at Break, % 15
9.0
Poisson's Ratio 0.34
0.29
Shear Modulus, GPa 43
86
Tensile Strength: Ultimate (UTS), MPa 220
700
Tensile Strength: Yield (Proof), MPa 130
500

Thermal Properties

Latent Heat of Fusion, J/g 210
330
Melting Completion (Liquidus), °C 1090
1350
Melting Onset (Solidus), °C 1040
1190
Specific Heat Capacity, J/kg-K 390
450
Thermal Conductivity, W/m-K 390
15
Thermal Expansion, µm/m-K 17
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 100
1.9
Electrical Conductivity: Equal Weight (Specific), % IACS 100
2.1

Otherwise Unclassified Properties

Density, g/cm3 9.0
8.4
Embodied Carbon, kg CO2/kg material 2.7
8.0
Embodied Energy, MJ/kg 42
110
Embodied Water, L/kg 360
520

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 29
57
Resilience: Unit (Modulus of Resilience), kJ/m3 76
570
Stiffness to Weight: Axial, points 7.2
15
Stiffness to Weight: Bending, points 18
24
Strength to Weight: Axial, points 6.8
23
Strength to Weight: Bending, points 9.0
21
Thermal Diffusivity, mm2/s 110
3.8
Thermal Shock Resistance, points 7.8
21

Alloy Composition

Bismuth (Bi), % 0 to 0.00050
0
Carbon (C), % 0
0.2 to 0.35
Chromium (Cr), % 0
26 to 29
Cobalt (Co), % 0
61.7 to 67.3
Copper (Cu), % 99.85 to 99.94
0
Iron (Fe), % 0
0 to 3.0
Molybdenum (Mo), % 0
4.5 to 6.0
Nickel (Ni), % 0
2.0 to 3.0
Oxygen (O), % 0 to 0.040
0
Silicon (Si), % 0
0 to 1.5
Silver (Ag), % 0.060 to 0.080
0