# 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 10 ^{6} psi*

Elongation at Break

9.1 *%*

Fatigue Strength

480 *MPa* 70 *x 10 ^{3} psi*

Poisson's Ratio

0.32

Reduction in Area

17 *%*

Shear Modulus

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

Shear Strength

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

Tensile Strength: Ultimate (UTS)

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

Tensile Strength: Yield (Proof)

850 *MPa* 120 *x 10 ^{3} 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/cm ^{3}* 280

*lb/ft*

^{3}Embodied Carbon

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

Embodied Energy

610 *MJ/kg* 260 *x 10 ^{3} BTU/lb*

Embodied Water

200 *L/kg* 23 *gal/lb*

## Common Calculations

Resilience: Ultimate (Unit Rupture Work)

83 *MJ/m ^{3}*

Resilience: Unit (Modulus of Resilience)

3440 *kJ/m ^{3}*

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 *mm ^{2}/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