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Grade C-6 Titanium vs. R31538 Cobalt

Grade C-6 titanium belongs to the titanium alloys classification, while R31538 cobalt belongs to the cobalt alloys. There are 28 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.

For each property being compared, the top bar is grade C-6 titanium and the bottom bar is R31538 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 100
220
Elongation at Break, % 9.0
13 to 23
Fatigue Strength, MPa 460
310 to 480
Poisson's Ratio 0.32
0.29
Rockwell C Hardness 32
25 to 35
Shear Modulus, GPa 39
86
Tensile Strength: Ultimate (UTS), MPa 890
1020 to 1360
Tensile Strength: Yield (Proof), MPa 830
580 to 930

Thermal Properties

Latent Heat of Fusion, J/g 410
320
Melting Completion (Liquidus), °C 1580
1360
Melting Onset (Solidus), °C 1530
1290
Specific Heat Capacity, J/kg-K 550
450
Thermal Conductivity, W/m-K 7.8
13
Thermal Expansion, µm/m-K 9.8
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.2
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 2.5
2.1

Otherwise Unclassified Properties

Density, g/cm3 4.5
8.4
Embodied Carbon, kg CO2/kg material 30
8.1
Embodied Energy, MJ/kg 480
110
Embodied Water, L/kg 190
530

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 78
140 to 200
Resilience: Unit (Modulus of Resilience), kJ/m3 3300
750 to 1920
Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 35
24
Strength to Weight: Axial, points 55
34 to 45
Strength to Weight: Bending, points 46
27 to 32
Thermal Diffusivity, mm2/s 3.2
3.5
Thermal Shock Resistance, points 63
25 to 33

Alloy Composition


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Aluminum (Al), % 4.0 to 6.0
0
Carbon (C), % 0 to 0.1
0.15 to 0.35
Chromium (Cr), % 0
26 to 30
Cobalt (Co), % 0
58.7 to 68.9
Hydrogen (H), % 0 to 0.015
0
Iron (Fe), % 0 to 0.5
0 to 0.75
Manganese (Mn), % 0
0 to 1.0
Molybdenum (Mo), % 0
5.0 to 7.0
Nickel (Ni), % 0 to 0.050
0 to 1.0
Nitrogen (N), % 0
0 to 0.25
Oxygen (O), % 0 to 0.2
0
Silicon (Si), % 0
0 to 1.0
Tin (Sn), % 2.0 to 3.0
0
Titanium (Ti), % 89.7 to 94
0
Residuals, % 0 to 0.4
0