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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

Titanium (Ti) 85.8 to 92.2
Molybdenum (Mo) 3.0 to 5.0
Aluminum (Al) 3.0 to 5.0
Tin (Sn) 1.5 to 2.5
Silicon (Si) 0.3 to 0.7
Oxygen (O) 0 to 0.25
Iron (Fe) 0 to 0.2
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

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