Titanium 6-5-0.5 (3.7155)
Titanium 6-5-0.5 is a titanium alloy formulated for primary forming into wrought products. Cited properties are appropriate for the annealed condition. It has the lowest thermal conductivity among wrought titaniums. In addition, it has a moderately low melting temperature and a fairly low ductility.
The graph bars on the material properties cards below compare titanium 6-5-0.5 to: wrought titaniums (top), all titanium alloys (middle), and the entire database (bottom). A full bar means this is the highest value in the relevant set. A half-full bar means it's 50% of the highest, and so on.
Mechanical Properties
Elastic (Young's, Tensile) Modulus
100 GPa 15 x 106 psi
Elongation at Break
6.7 %
Fatigue Strength
530 MPa 77 x 103 psi
Poisson's Ratio
0.32
Reduction in Area
23 %
Shear Modulus
40 GPa 5.8 x 106 psi
Shear Strength
630 MPa 92 x 103 psi
Tensile Strength: Ultimate (UTS)
1080 MPa 160 x 103 psi
Tensile Strength: Yield (Proof)
990 MPa 140 x 103 psi
Thermal Properties
Latent Heat of Fusion
410 J/g
Maximum Temperature: Mechanical
300 °C 580 °F
Melting Completion (Liquidus)
1610 °C 2930 °F
Melting Onset (Solidus)
1560 °C 2840 °F
Specific Heat Capacity
550 J/kg-K 0.13 BTU/lb-°F
Thermal Conductivity
4.2 W/m-K 2.4 BTU/h-ft-°F
Thermal Expansion
9.4 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
1.0 % IACS
Electrical Conductivity: Equal Weight (Specific)
2.1 % IACS
Otherwise Unclassified Properties
Base Metal Price
41 % relative
Density
4.5 g/cm3 280 lb/ft3
Embodied Carbon
33 kg CO2/kg material
Embodied Energy
540 MJ/kg 230 x 103 BTU/lb
Embodied Water
180 L/kg 22 gal/lb
Common Calculations
Resilience: Ultimate (Unit Rupture Work)
71 MJ/m3
Resilience: Unit (Modulus of Resilience)
4630 kJ/m3
Stiffness to Weight: Axial
13 points
Stiffness to Weight: Bending
35 points
Strength to Weight: Axial
67 points
Strength to Weight: Bending
52 points
Thermal Diffusivity
1.7 mm2/s
Thermal Shock Resistance
79 points
Alloy Composition
| Ti | 85.6 to 90.1 | |
| Al | 5.7 to 6.3 | |
| Zr | 4.0 to 6.0 | |
| Mo | 0.25 to 0.75 | |
| Si | 0 to 0.4 | |
| Fe | 0 to 0.2 | |
| O | 0 to 0.19 | |
| C | 0 to 0.080 | |
| N | 0 to 0.050 | |
| H | 0 to 0.015 | |
| res. | 0 to 0.4 |
All values are % weight. Ranges represent what is permitted under applicable standards.
Followup Questions
Similar Alloys
Further Reading
Titanium Alloys: Modelling of Microstructure, Properties, and Applications, Wei Sha and Savko Malinov, 2009
Titanium and Titanium Alloys: Fundamentals and Applications, Christoph Leyens and Manfred Peters (editors), 2003
Titanium, 2nd ed., G. Lutjering and J. C. Williams, 2007