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R31538 Cobalt vs. Nickel 80A

R31538 cobalt belongs to the cobalt alloys classification, while nickel 80A belongs to the nickel alloys. They have a modest 21% of their average alloy composition in common, which, by itself, doesn't mean much. There are 27 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 R31538 cobalt and the bottom bar is nickel 80A.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
190
Elongation at Break, % 13 to 23
22
Fatigue Strength, MPa 310 to 480
430
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 86
74
Tensile Strength: Ultimate (UTS), MPa 1020 to 1360
1040
Tensile Strength: Yield (Proof), MPa 580 to 930
710

Thermal Properties

Latent Heat of Fusion, J/g 320
320
Melting Completion (Liquidus), °C 1360
1360
Melting Onset (Solidus), °C 1290
1310
Specific Heat Capacity, J/kg-K 450
470
Thermal Conductivity, W/m-K 13
11
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
1.5
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
1.6

Otherwise Unclassified Properties

Density, g/cm3 8.4
8.3
Embodied Carbon, kg CO2/kg material 8.1
9.8
Embodied Energy, MJ/kg 110
140
Embodied Water, L/kg 530
280

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 200
210
Resilience: Unit (Modulus of Resilience), kJ/m3 750 to 1920
1300
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 24
23
Strength to Weight: Axial, points 34 to 45
35
Strength to Weight: Bending, points 27 to 32
27
Thermal Diffusivity, mm2/s 3.5
2.9
Thermal Shock Resistance, points 25 to 33
31

Alloy Composition

Aluminum (Al), % 0
0.5 to 1.8
Carbon (C), % 0.15 to 0.35
0 to 0.1
Chromium (Cr), % 26 to 30
18 to 21
Cobalt (Co), % 58.7 to 68.9
0
Iron (Fe), % 0 to 0.75
0 to 3.0
Manganese (Mn), % 0 to 1.0
0 to 1.0
Molybdenum (Mo), % 5.0 to 7.0
0
Nickel (Ni), % 0 to 1.0
69.4 to 79.7
Nitrogen (N), % 0 to 0.25
0
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0
0 to 0.015
Titanium (Ti), % 0
1.8 to 2.7