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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

Titanium (Ti) 85.6 to 90.1
Aluminum (Al) 5.7 to 6.3
Zirconium (Zr) 4.0 to 6.0
Molybdenum (Mo) 0.25 to 0.75
Silicon (Si) 0 to 0.4
Iron (Fe) 0 to 0.2
Oxygen (O) 0 to 0.19
Carbon (C) 0 to 0.080
Nitrogen (N) 0 to 0.050
Hydrogen (H) 0 to 0.015
Residuals 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