Aged Titanium 4-4-2
Aged titanium 4-4-2 is titanium 4-4-2 in the aged (precipitation hardened) condition. The graph bars on the material properties cards below compare aged titanium 4-4-2 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
10 %
Fatigue Strength
620 MPa 89 x 103 psi
Poisson's Ratio
0.32
Reduction in Area
20 %
Shear Modulus
42 GPa 6.1 x 106 psi
Shear Strength
750 MPa 110 x 103 psi
Tensile Strength: Ultimate (UTS)
1250 MPa 180 x 103 psi
Tensile Strength: Yield (Proof)
1080 MPa 160 x 103 psi
Thermal Properties
Latent Heat of Fusion
410 J/g
Maximum Temperature: Mechanical
310 °C 590 °F
Melting Completion (Liquidus)
1610 °C 2930 °F
Melting Onset (Solidus)
1560 °C 2840 °F
Specific Heat Capacity
540 J/kg-K 0.13 BTU/lb-°F
Thermal Conductivity
6.7 W/m-K 3.9 BTU/h-ft-°F
Thermal Expansion
8.6 µm/m-K
Otherwise Unclassified Properties
Base Metal Price
39 % relative
Density
4.7 g/cm3 290 lb/ft3
Embodied Carbon
30 kg CO2/kg material
Embodied Energy
480 MJ/kg 200 x 103 BTU/lb
Embodied Water
180 L/kg 22 gal/lb
Common Calculations
Resilience: Ultimate (Unit Rupture Work)
120 MJ/m3
Resilience: Unit (Modulus of Resilience)
5160 kJ/m3
Stiffness to Weight: Axial
13 points
Stiffness to Weight: Bending
34 points
Strength to Weight: Axial
74 points
Strength to Weight: Bending
55 points
Thermal Diffusivity
2.6 mm2/s
Thermal Shock Resistance
93 points
Alloy Composition
| Ti | 85.8 to 92.2 | |
| Mo | 3.0 to 5.0 | |
| Al | 3.0 to 5.0 | |
| Sn | 1.5 to 2.5 | |
| Si | 0.3 to 0.7 | |
| O | 0 to 0.25 | |
| Fe | 0 to 0.2 | |
| 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
Further Reading
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