MakeItFrom.com
Menu (ESC)

Titanium 6-7 (R56700)

Titanium 6-7 is a titanium alloy formulated for primary forming into wrought products. Cited properties are appropriate for the annealed condition. R56700 is the UNS number for this material. Titanium 6-7 is the common industry name.

It has the highest base cost among wrought titaniums. In addition, it has a fairly high density and a fairly high melting temperature.

The graph bars on the material properties cards below compare titanium 6-7 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

120 GPa 17 x 106 psi

Elongation at Break

11 %

Fatigue Strength

530 MPa 77 x 103 psi

Poisson's Ratio

0.33

Reduction in Area

29 %

Shear Modulus

45 GPa 6.5 x 106 psi

Shear Strength

610 MPa 88 x 103 psi

Tensile Strength: Ultimate (UTS)

1020 MPa 150 x 103 psi

Tensile Strength: Yield (Proof)

900 MPa 130 x 103 psi

Thermal Properties

Latent Heat of Fusion

410 J/g

Maximum Temperature: Mechanical

300 °C 580 °F

Melting Completion (Liquidus)

1700 °C 3100 °F

Melting Onset (Solidus)

1650 °C 3000 °F

Specific Heat Capacity

520 J/kg-K 0.13 BTU/lb-°F

Thermal Expansion

9.3 µm/m-K

Otherwise Unclassified Properties

Base Metal Price

75 % relative

Density

5.1 g/cm3 320 lb/ft3

Embodied Carbon

34 kg CO2/kg material

Embodied Energy

540 MJ/kg 230 x 103 BTU/lb

Embodied Water

190 L/kg 23 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

110 MJ/m3

Resilience: Unit (Modulus of Resilience)

3460 kJ/m3

Stiffness to Weight: Axial

13 points

Stiffness to Weight: Bending

32 points

Strength to Weight: Axial

56 points

Strength to Weight: Bending

44 points

Thermal Shock Resistance

66 points

Alloy Composition

Titanium (Ti) 84.9 to 88
Molybdenum (Mo) 6.5 to 7.5
Niobium (Nb) 6.5 to 7.5
Aluminum (Al) 5.5 to 6.5
Tantalum (Ta) 0 to 0.5
Iron (Fe) 0 to 0.25
Oxygen (O) 0 to 0.2
Carbon (C) 0 to 0.080
Nitrogen (N) 0 to 0.050
Hydrogen (H) 0 to 0.0090

All values are % weight. Ranges represent what is permitted under applicable standards.

Followup Questions

Similar Alloys

Further Reading

ASTM F1295: Standard Specification for Wrought Titanium-6 Aluminum-7 Niobium Alloy for Surgical Implant Applications (UNS R56700)

Titanium and Titanium Alloys: Fundamentals and Applications, Christoph Leyens and Manfred Peters (editors), 2003

Titanium, 2nd ed., G. Lutjering and J. C. Williams, 2007

CRC Materials Science and Engineering Handbook, 4th ed., James F. Shackelford et al. (editors), 2015