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R31537 Cobalt vs. Nickel 684

R31537 cobalt belongs to the cobalt alloys classification, while nickel 684 belongs to the nickel alloys. They have a modest 40% of their average alloy composition in common, which, by itself, doesn't mean much. There are 24 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown.

For each property being compared, the top bar is R31537 cobalt and the bottom bar is nickel 684.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
200
Elongation at Break, % 14 to 23
11
Fatigue Strength, MPa 310 to 480
390
Poisson's Ratio 0.29
0.29
Reduction in Area, % 13 to 23
17
Shear Modulus, GPa 87
76
Tensile Strength: Ultimate (UTS), MPa 1000 to 1340
1190
Tensile Strength: Yield (Proof), MPa 590 to 940
800

Thermal Properties

Latent Heat of Fusion, J/g 320
320
Melting Completion (Liquidus), °C 1360
1370
Melting Onset (Solidus), °C 1290
1320
Specific Heat Capacity, J/kg-K 450
470
Thermal Expansion, µm/m-K 13
13

Otherwise Unclassified Properties

Density, g/cm3 8.4
8.3
Embodied Carbon, kg CO2/kg material 8.1
10
Embodied Energy, MJ/kg 110
140
Embodied Water, L/kg 530
360

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 200
120
Resilience: Unit (Modulus of Resilience), kJ/m3 780 to 1990
1610
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 24
23
Strength to Weight: Axial, points 33 to 44
40
Strength to Weight: Bending, points 26 to 32
30
Thermal Shock Resistance, points 24 to 32
34

Alloy Composition

Aluminum (Al), % 0
2.5 to 3.3
Boron (B), % 0
0.0030 to 0.010
Carbon (C), % 0 to 0.14
0 to 0.15
Chromium (Cr), % 26 to 30
15 to 20
Cobalt (Co), % 58.9 to 69
13 to 20
Copper (Cu), % 0
0 to 0.15
Iron (Fe), % 0 to 0.75
0 to 4.0
Manganese (Mn), % 0 to 1.0
0 to 0.75
Molybdenum (Mo), % 5.0 to 7.0
3.0 to 5.0
Nickel (Ni), % 0 to 1.0
42.7 to 64
Nitrogen (N), % 0 to 0.25
0
Phosphorus (P), % 0
0 to 0.015
Silicon (Si), % 0 to 1.0
0 to 0.75
Sulfur (S), % 0
0 to 0.015
Titanium (Ti), % 0
2.5 to 3.3