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Grade 7 Titanium vs. R31539 Cobalt

Grade 7 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 (4, in this case) are not shown.

For each property being compared, the top bar is grade 7 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, % 24
13 to 22
Fatigue Strength, MPa 250
310 to 480
Poisson's Ratio 0.32
0.29
Reduction in Area, % 34
13 to 23
Shear Modulus, GPa 38
86
Tensile Strength: Ultimate (UTS), MPa 420
1000 to 1340
Tensile Strength: Yield (Proof), MPa 340
590 to 940

Thermal Properties

Latent Heat of Fusion, J/g 420
320
Melting Completion (Liquidus), °C 1660
1360
Melting Onset (Solidus), °C 1610
1290
Specific Heat Capacity, J/kg-K 540
450
Thermal Conductivity, W/m-K 22
13
Thermal Expansion, µm/m-K 9.2
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 3.6
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 7.2
2.1

Otherwise Unclassified Properties

Density, g/cm3 4.5
8.4
Embodied Carbon, kg CO2/kg material 47
8.2
Embodied Energy, MJ/kg 800
110
Embodied Water, L/kg 470
530

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 95
140 to 190
Resilience: Unit (Modulus of Resilience), kJ/m3 560
780 to 2000
Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 35
24
Strength to Weight: Axial, points 26
33 to 44
Strength to Weight: Bending, points 28
27 to 32
Thermal Diffusivity, mm2/s 8.9
3.5
Thermal Shock Resistance, points 31
24 to 32

Alloy Composition


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Aluminum (Al), % 0
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 0.3
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 0.25
0
Palladium (Pd), % 0.12 to 0.25
0
Silicon (Si), % 0
0 to 1.0
Titanium (Ti), % 98.7 to 99.88
0
Residuals, % 0 to 0.4
0