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Grade 18 Titanium vs. R31539 Cobalt

Grade 18 titanium belongs to the titanium alloys classification, while R31539 cobalt belongs to the cobalt alloys. There are 28 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.

For each property being compared, the top bar is grade 18 titanium and the bottom bar is R31539 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 110
220
Elongation at Break, % 11 to 17
13 to 22
Fatigue Strength, MPa 330 to 480
310 to 480
Poisson's Ratio 0.32
0.29
Reduction in Area, % 23
13 to 23
Shear Modulus, GPa 40
86
Tensile Strength: Ultimate (UTS), MPa 690 to 980
1000 to 1340
Tensile Strength: Yield (Proof), MPa 540 to 810
590 to 940

Thermal Properties

Latent Heat of Fusion, J/g 410
320
Melting Completion (Liquidus), °C 1640
1360
Melting Onset (Solidus), °C 1590
1290
Specific Heat Capacity, J/kg-K 550
450
Thermal Conductivity, W/m-K 8.3
13
Thermal Expansion, µm/m-K 9.9
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.3
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 2.7
2.1

Otherwise Unclassified Properties

Density, g/cm3 4.5
8.4
Embodied Carbon, kg CO2/kg material 41
8.2
Embodied Energy, MJ/kg 670
110
Embodied Water, L/kg 270
530

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 87 to 110
140 to 190
Resilience: Unit (Modulus of Resilience), kJ/m3 1380 to 3110
780 to 2000
Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 35
24
Strength to Weight: Axial, points 43 to 61
33 to 44
Strength to Weight: Bending, points 39 to 49
27 to 32
Thermal Diffusivity, mm2/s 3.4
3.5
Thermal Shock Resistance, points 47 to 67
24 to 32

Alloy Composition


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Aluminum (Al), % 2.5 to 3.5
0.3 to 1.0
Carbon (C), % 0 to 0.080
0 to 0.14
Chromium (Cr), % 0
26 to 30
Cobalt (Co), % 0
57.7 to 68.7
Hydrogen (H), % 0 to 0.015
0
Iron (Fe), % 0 to 0.25
0 to 0.75
Lanthanum (La), % 0
0.030 to 0.2
Manganese (Mn), % 0
0 to 1.0
Molybdenum (Mo), % 0
5.0 to 7.0
Nickel (Ni), % 0
0 to 1.0
Nitrogen (N), % 0 to 0.030
0 to 0.25
Oxygen (O), % 0 to 0.15
0
Palladium (Pd), % 0.040 to 0.080
0
Silicon (Si), % 0
0 to 1.0
Titanium (Ti), % 92.5 to 95.5
0
Vanadium (V), % 2.0 to 3.0
0
Residuals, % 0 to 0.4
0

Comparable Variants