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Nickel 684 vs. R31233 Cobalt

Nickel 684 belongs to the nickel alloys classification, while R31233 cobalt belongs to the cobalt alloys. They have 50% of their average alloy composition in common. There are 23 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 nickel 684 and the bottom bar is R31233 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
220
Elongation at Break, % 11
17
Fatigue Strength, MPa 390
220
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 76
85
Tensile Strength: Ultimate (UTS), MPa 1190
1020
Tensile Strength: Yield (Proof), MPa 800
420

Thermal Properties

Latent Heat of Fusion, J/g 320
320
Melting Completion (Liquidus), °C 1370
1350
Melting Onset (Solidus), °C 1320
1330
Specific Heat Capacity, J/kg-K 470
440
Thermal Expansion, µm/m-K 13
13

Otherwise Unclassified Properties

Density, g/cm3 8.3
8.6
Embodied Carbon, kg CO2/kg material 10
8.4
Embodied Energy, MJ/kg 140
110
Embodied Water, L/kg 360
480

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
140
Resilience: Unit (Modulus of Resilience), kJ/m3 1610
410
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 23
23
Strength to Weight: Axial, points 40
33
Strength to Weight: Bending, points 30
26
Thermal Shock Resistance, points 34
25

Alloy Composition

Aluminum (Al), % 2.5 to 3.3
0
Boron (B), % 0.0030 to 0.010
0 to 0.015
Carbon (C), % 0 to 0.15
0.020 to 0.1
Chromium (Cr), % 15 to 20
23.5 to 27.5
Cobalt (Co), % 13 to 20
44.7 to 63.3
Copper (Cu), % 0 to 0.15
0
Iron (Fe), % 0 to 4.0
1.0 to 5.0
Manganese (Mn), % 0 to 0.75
0.1 to 1.5
Molybdenum (Mo), % 3.0 to 5.0
4.0 to 6.0
Nickel (Ni), % 42.7 to 64
7.0 to 11
Nitrogen (N), % 0
0.030 to 0.12
Phosphorus (P), % 0 to 0.015
0 to 0.030
Silicon (Si), % 0 to 0.75
0.050 to 1.0
Sulfur (S), % 0 to 0.015
0 to 0.020
Titanium (Ti), % 2.5 to 3.3
0
Tungsten (W), % 0
1.0 to 3.0