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Nickel 684 vs. R30016 Cobalt

Nickel 684 belongs to the nickel alloys classification, while R30016 cobalt belongs to the cobalt alloys. They have a modest 39% 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 (12, in this case) are not shown.

For each property being compared, the top bar is nickel 684 and the bottom bar is R30016 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
220
Elongation at Break, % 11
8.4
Fatigue Strength, MPa 390
290
Poisson's Ratio 0.29
0.28
Reduction in Area, % 17
8.0
Shear Modulus, GPa 76
85
Tensile Strength: Ultimate (UTS), MPa 1190
1010
Tensile Strength: Yield (Proof), MPa 800
580

Thermal Properties

Latent Heat of Fusion, J/g 320
320
Melting Completion (Liquidus), °C 1370
1360
Melting Onset (Solidus), °C 1320
1270
Specific Heat Capacity, J/kg-K 470
450
Thermal Expansion, µm/m-K 13
14

Otherwise Unclassified Properties

Density, g/cm3 8.3
8.5
Embodied Carbon, kg CO2/kg material 10
7.7
Embodied Energy, MJ/kg 140
110
Embodied Water, L/kg 360
500

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
72
Resilience: Unit (Modulus of Resilience), kJ/m3 1610
770
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 23
24
Strength to Weight: Axial, points 40
33
Strength to Weight: Bending, points 30
26
Thermal Shock Resistance, points 34
24

Alloy Composition

Aluminum (Al), % 2.5 to 3.3
0
Boron (B), % 0.0030 to 0.010
0
Carbon (C), % 0 to 0.15
0.9 to 1.4
Chromium (Cr), % 15 to 20
28 to 32
Cobalt (Co), % 13 to 20
49.6 to 66.9
Copper (Cu), % 0 to 0.15
0
Iron (Fe), % 0 to 4.0
0 to 3.0
Manganese (Mn), % 0 to 0.75
0.5 to 2.0
Molybdenum (Mo), % 3.0 to 5.0
0 to 1.5
Nickel (Ni), % 42.7 to 64
0 to 3.0
Phosphorus (P), % 0 to 0.015
0
Silicon (Si), % 0 to 0.75
0.2 to 2.0
Sulfur (S), % 0 to 0.015
0
Titanium (Ti), % 2.5 to 3.3
0
Tungsten (W), % 0
3.5 to 5.5