# Titanium 6-5-0.5 (3.7155)

Titanium 6-5-0.5 is a titanium alloy formulated for primary forming into wrought products. Cited properties are appropriate for the annealed condition. It has the lowest thermal conductivity among wrought titaniums. In addition, it has a moderately low melting temperature and a fairly low ductility.

The graph bars on the material properties cards below compare titanium 6-5-0.5 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

100 *GPa* 15 *x 10 ^{6} psi*

Elongation at Break

6.7 *%*

Fatigue Strength

530 *MPa* 77 *x 10 ^{3} psi*

Poisson's Ratio

0.32

Reduction in Area

23 *%*

Shear Modulus

40 *GPa* 5.8 *x 10 ^{6} psi*

Shear Strength

630 *MPa* 92 *x 10 ^{3} psi*

Tensile Strength: Ultimate (UTS)

1080 *MPa* 160 *x 10 ^{3} psi*

Tensile Strength: Yield (Proof)

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

## Thermal Properties

Latent Heat of Fusion

410 *J/g*

Maximum Temperature: Mechanical

300 *°C* 580 *°F*

Melting Completion (Liquidus)

1610 *°C* 2930 *°F*

Melting Onset (Solidus)

1560 *°C* 2840 *°F*

Specific Heat Capacity

550 *J/kg-K* 0.13 *BTU/lb-°F*

Thermal Conductivity

4.2 *W/m-K* 2.4 *BTU/h-ft-°F*

Thermal Expansion

9.4 *µm/m-K*

## Electrical Properties

Electrical Conductivity: Equal Volume

1.0 *% IACS*

Electrical Conductivity: Equal Weight (Specific)

2.1 *% IACS*

## Otherwise Unclassified Properties

Base Metal Price

41 *% relative*

Density

4.5 *g/cm ^{3}* 280

*lb/ft*

^{3}Embodied Carbon

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

Embodied Energy

540 *MJ/kg* 230 *x 10 ^{3} BTU/lb*

Embodied Water

180 *L/kg* 22 *gal/lb*

## Common Calculations

Resilience: Ultimate (Unit Rupture Work)

71 *MJ/m ^{3}*

Resilience: Unit (Modulus of Resilience)

4630 *kJ/m ^{3}*

Stiffness to Weight: Axial

13 *points*

Stiffness to Weight: Bending

35 *points*

Strength to Weight: Axial

67 *points*

Strength to Weight: Bending

52 *points*

Thermal Diffusivity

1.7 *mm ^{2}/s*

Thermal Shock Resistance

79 *points*

## Alloy Composition

Ti | 85.6 to 90.1 | |

Al | 5.7 to 6.3 | |

Zr | 4.0 to 6.0 | |

Mo | 0.25 to 0.75 | |

Si | 0 to 0.4 | |

Fe | 0 to 0.2 | |

O | 0 to 0.19 | |

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

## 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