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Titanium 6-2-4-2 vs. R30021 Cobalt

Titanium 6-2-4-2 belongs to the titanium alloys classification, while R30021 cobalt belongs to the cobalt 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 titanium 6-2-4-2 and the bottom bar is R30021 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 110
220
Elongation at Break, % 8.6
9.0
Fatigue Strength, MPa 490
250
Poisson's Ratio 0.32
0.29
Shear Modulus, GPa 40
86
Tensile Strength: Ultimate (UTS), MPa 950
700
Tensile Strength: Yield (Proof), MPa 880
500

Thermal Properties

Latent Heat of Fusion, J/g 400
330
Melting Completion (Liquidus), °C 1590
1350
Melting Onset (Solidus), °C 1540
1190
Specific Heat Capacity, J/kg-K 540
450
Thermal Conductivity, W/m-K 6.9
15
Thermal Expansion, µm/m-K 9.5
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 0.9
1.9
Electrical Conductivity: Equal Weight (Specific), % IACS 1.8
2.1

Otherwise Unclassified Properties

Density, g/cm3 4.6
8.4
Embodied Carbon, kg CO2/kg material 32
8.0
Embodied Energy, MJ/kg 520
110
Embodied Water, L/kg 210
520

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 79
57
Resilience: Unit (Modulus of Resilience), kJ/m3 3640
570
Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 34
24
Strength to Weight: Axial, points 57
23
Strength to Weight: Bending, points 46
21
Thermal Diffusivity, mm2/s 2.8
3.8
Thermal Shock Resistance, points 67
21

Alloy Composition


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Aluminum (Al), % 5.5 to 6.5
0
Carbon (C), % 0 to 0.050
0.2 to 0.35
Chromium (Cr), % 0
26 to 29
Cobalt (Co), % 0
61.7 to 67.3
Hydrogen (H), % 0 to 0.015
0
Iron (Fe), % 0 to 0.25
0 to 3.0
Molybdenum (Mo), % 1.8 to 2.2
4.5 to 6.0
Nickel (Ni), % 0
2.0 to 3.0
Nitrogen (N), % 0 to 0.050
0
Oxygen (O), % 0 to 0.15
0
Silicon (Si), % 0.060 to 0.12
0 to 1.5
Tin (Sn), % 1.8 to 2.2
0
Titanium (Ti), % 83.7 to 87.2
0
Zirconium (Zr), % 3.6 to 4.4
0
Residuals, % 0 to 0.4
0