# 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 10 ^{6} psi*

Elongation at Break

8.6 *%*

Fatigue Strength

490 *MPa* 71 *x 10 ^{3} psi*

Poisson's Ratio

0.32

Reduction in Area

21 *%*

Shear Modulus

40 *GPa* 5.9 *x 10 ^{6} psi*

Shear Strength

560 *MPa* 81 *x 10 ^{3} psi*

Tensile Strength: Ultimate (UTS)

950 *MPa* 140 *x 10 ^{3} psi*

Tensile Strength: Yield (Proof)

880 *MPa* 130 *x 10 ^{3} 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/cm ^{3}* 290

*lb/ft*

^{3}Embodied Carbon

32 *kg CO _{2}/kg material*

Embodied Energy

520 *MJ/kg* 220 *x 10 ^{3} BTU/lb*

Embodied Water

210 *L/kg* 24 *gal/lb*

## Common Calculations

Resilience: Ultimate (Unit Rupture Work)

79 *MJ/m ^{3}*

Resilience: Unit (Modulus of Resilience)

3640 *kJ/m ^{3}*

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 *mm ^{2}/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