# Grade C-5 Cast Titanium

Grade C-5 titanium is a titanium alloy formulated for casting. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. It has a fairly low electrical conductivity among cast titaniums. In addition, it has the lowest ductility and the highest tensile strength.

The graph bars on the material properties cards below compare grade C-5 titanium to: cast 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

Brinell Hardness

310

Elastic (Young's, Tensile) Modulus

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

Elongation at Break

6.7 *%*

Fatigue Strength

510 *MPa* 74 *x 10 ^{3} psi*

Poisson's Ratio

0.32

Rockwell C Hardness

34

Shear Modulus

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

Tensile Strength: Ultimate (UTS)

1000 *MPa* 150 *x 10 ^{3} psi*

Tensile Strength: Yield (Proof)

940 *MPa* 140 *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* 2930 *°F*

Melting Onset (Solidus)

1560 *°C* 2840 *°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

4.4 *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* 24 *gal/lb*

## Common Calculations

Resilience: Ultimate (Unit Rupture Work)

66 *MJ/m ^{3}*

Resilience: Unit (Modulus of Resilience)

4200 *kJ/m ^{3}*

Stiffness to Weight: Axial

13 *points*

Stiffness to Weight: Bending

35 *points*

Strength to Weight: Axial

63 *points*

Strength to Weight: Bending

50 *points*

Thermal Diffusivity

2.9 *mm ^{2}/s*

Thermal Shock Resistance

71 *points*

## Alloy Composition

Ti | 87.5 to 91 | |

Al | 5.5 to 6.8 | |

V | 3.5 to 4.5 | |

Fe | 0 to 0.4 | |

O | 0 to 0.25 | |

C | 0 to 0.1 | |

Ni | 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

ASTM B367: Standard Specification for Titanium and Titanium Alloy Castings

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