UNS R56401 Titanium
R56401 titanium is a titanium alloy formulated for primary forming into wrought products. Cited properties are appropriate for the annealed condition.
It has a moderately high heat capacity among wrought titaniums. In addition, it has a moderately low melting temperature and a moderately low ductility.
The graph bars on the material properties cards below compare R56401 titanium 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 15 x 106 psi
Elongation at Break
9.1 %
Fatigue Strength
480 MPa 70 x 103 psi
Poisson's Ratio
0.32
Reduction in Area
17 %
Shear Modulus
40 GPa 5.8 x 106 psi
Shear Strength
560 MPa 81 x 103 psi
Tensile Strength: Ultimate (UTS)
940 MPa 140 x 103 psi
Tensile Strength: Yield (Proof)
850 MPa 120 x 103 psi
Thermal Properties
Latent Heat of Fusion
410 J/g
Maximum Temperature: Mechanical
340 °C 640 °F
Melting Completion (Liquidus)
1610 °C 2940 °F
Melting Onset (Solidus)
1560 °C 2850 °F
Specific Heat Capacity
560 J/kg-K 0.13 BTU/lb-°F
Thermal Conductivity
7.1 W/m-K 4.1 BTU/h-ft-°F
Thermal Expansion
9.6 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
1.0 % IACS
Electrical Conductivity: Equal Weight (Specific)
2.0 % IACS
Otherwise Unclassified Properties
Base Metal Price
36 % relative
Density
4.5 g/cm3 280 lb/ft3
Embodied Carbon
38 kg CO2/kg material
Embodied Energy
610 MJ/kg 260 x 103 BTU/lb
Embodied Water
200 L/kg 23 gal/lb
Common Calculations
Resilience: Ultimate (Unit Rupture Work)
83 MJ/m3
Resilience: Unit (Modulus of Resilience)
3440 kJ/m3
Stiffness to Weight: Axial
13 points
Stiffness to Weight: Bending
35 points
Strength to Weight: Axial
59 points
Strength to Weight: Bending
48 points
Thermal Diffusivity
2.9 mm2/s
Thermal Shock Resistance
67 points
Alloy Composition
| Ti | 88.5 to 91 | |
| Al | 5.5 to 6.5 | |
| V | 3.5 to 4.5 | |
| Fe | 0 to 0.25 | |
| O | 0 to 0.13 | |
| C | 0 to 0.080 | |
| N | 0 to 0.050 | |
| H | 0 to 0.012 |
All values are % weight. Ranges represent what is permitted under applicable standards.
Followup Questions
Similar Alloys
Further Reading
ASTM F136: Standard Specification for Wrought Titanium-6Aluminum-4Vanadium ELI (Extra Low Interstitial) Alloy for Surgical Implant Applications (UNS R56401)
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