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R30021 Cobalt vs. Titanium 6-5-0.5

R30021 cobalt belongs to the cobalt alloys classification, while titanium 6-5-0.5 belongs to the titanium alloys. There are 27 material properties with values for both materials. Properties with values for just one material (6, in this case) are not shown.

For each property being compared, the top bar is R30021 cobalt and the bottom bar is titanium 6-5-0.5.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
100
Elongation at Break, % 9.0
6.7
Fatigue Strength, MPa 250
530
Poisson's Ratio 0.29
0.32
Shear Modulus, GPa 86
40
Tensile Strength: Ultimate (UTS), MPa 700
1080
Tensile Strength: Yield (Proof), MPa 500
990

Thermal Properties

Latent Heat of Fusion, J/g 330
410
Melting Completion (Liquidus), °C 1350
1610
Melting Onset (Solidus), °C 1190
1560
Specific Heat Capacity, J/kg-K 450
550
Thermal Conductivity, W/m-K 15
4.2
Thermal Expansion, µm/m-K 11
9.4

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.9
1.0
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
2.1

Otherwise Unclassified Properties

Density, g/cm3 8.4
4.5
Embodied Carbon, kg CO2/kg material 8.0
33
Embodied Energy, MJ/kg 110
540
Embodied Water, L/kg 520
180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 57
71
Resilience: Unit (Modulus of Resilience), kJ/m3 570
4630
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 24
35
Strength to Weight: Axial, points 23
67
Strength to Weight: Bending, points 21
52
Thermal Diffusivity, mm2/s 3.8
1.7
Thermal Shock Resistance, points 21
79

Alloy Composition


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Aluminum (Al), % 0
5.7 to 6.3
Carbon (C), % 0.2 to 0.35
0 to 0.080
Chromium (Cr), % 26 to 29
0
Cobalt (Co), % 61.7 to 67.3
0
Hydrogen (H), % 0
0 to 0.015
Iron (Fe), % 0 to 3.0
0 to 0.2
Molybdenum (Mo), % 4.5 to 6.0
0.25 to 0.75
Nickel (Ni), % 2.0 to 3.0
0
Nitrogen (N), % 0
0 to 0.050
Oxygen (O), % 0
0 to 0.19
Silicon (Si), % 0 to 1.5
0 to 0.4
Titanium (Ti), % 0
85.6 to 90.1
Zirconium (Zr), % 0
4.0 to 6.0
Residuals, % 0
0 to 0.4