Titanium 6-2-4-2 (3.7145, R54620)
Titanium 6-2-4-2 is a titanium alloy formulated for primary forming into wrought products. Cited properties are appropriate for the annealed condition. 3.7145 is the EN numeric designation for this material. R54620 is the UNS number. And Titanium 6-2-4-2 is the common industry name.
It has the lowest electrical conductivity among wrought titaniums. In addition, it has a fairly low melting temperature and a moderately low thermal conductivity.
The graph bars on the material properties cards below compare titanium 6-2-4-2 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
110 GPa 16 x 106 psi
Elongation at Break
8.6 %
Fatigue Strength
490 MPa 71 x 103 psi
Poisson's Ratio
0.32
Reduction in Area
21 %
Shear Modulus
40 GPa 5.9 x 106 psi
Shear Strength
560 MPa 81 x 103 psi
Tensile Strength: Ultimate (UTS)
950 MPa 140 x 103 psi
Tensile Strength: Yield (Proof)
880 MPa 130 x 103 psi
Thermal Properties
Latent Heat of Fusion
400 J/g
Maximum Temperature: Mechanical
300 °C 580 °F
Melting Completion (Liquidus)
1590 °C 2900 °F
Melting Onset (Solidus)
1540 °C 2810 °F
Specific Heat Capacity
540 J/kg-K 0.13 BTU/lb-°F
Thermal Conductivity
6.9 W/m-K 4.0 BTU/h-ft-°F
Thermal Expansion
9.5 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
0.9 % IACS
Electrical Conductivity: Equal Weight (Specific)
1.8 % IACS
Otherwise Unclassified Properties
Base Metal Price
42 % relative
Density
4.6 g/cm3 290 lb/ft3
Embodied Carbon
32 kg CO2/kg material
Embodied Energy
520 MJ/kg 220 x 103 BTU/lb
Embodied Water
210 L/kg 24 gal/lb
Common Calculations
Resilience: Ultimate (Unit Rupture Work)
79 MJ/m3
Resilience: Unit (Modulus of Resilience)
3640 kJ/m3
Stiffness to Weight: Axial
13 points
Stiffness to Weight: Bending
34 points
Strength to Weight: Axial
57 points
Strength to Weight: Bending
46 points
Thermal Diffusivity
2.8 mm2/s
Thermal Shock Resistance
67 points
Alloy Composition
| Ti | 83.7 to 87.2 | |
| Al | 5.5 to 6.5 | |
| Zr | 3.6 to 4.4 | |
| Mo | 1.8 to 2.2 | |
| Sn | 1.8 to 2.2 | |
| Fe | 0 to 0.25 | |
| Si | 0.060 to 0.12 | |
| O | 0 to 0.15 | |
| C | 0 to 0.050 | |
| 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