# Grade C-6 Cast Titanium

Grade C-6 titanium is a titanium alloy formulated for casting. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. It has the lowest embodied energy among cast titaniums. In addition, it has a fairly low ductility and a moderately low electrical conductivity.

The graph bars on the material properties cards below compare grade C-6 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

290

Elastic (Young's, Tensile) Modulus

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

Elongation at Break

9.0 *%*

Fatigue Strength

460 *MPa* 67 *x 10 ^{3} psi*

Poisson's Ratio

0.32

Rockwell C Hardness

32

Shear Modulus

39 *GPa* 5.7 *x 10 ^{6} psi*

Tensile Strength: Ultimate (UTS)

890 *MPa* 130 *x 10 ^{3} psi*

Tensile Strength: Yield (Proof)

830 *MPa* 120 *x 10 ^{3} psi*

## Thermal Properties

Latent Heat of Fusion

410 *J/g*

Maximum Temperature: Mechanical

310 *°C* 580 *°F*

Melting Completion (Liquidus)

1580 *°C* 2870 *°F*

Melting Onset (Solidus)

1530 *°C* 2780 *°F*

Specific Heat Capacity

550 *J/kg-K* 0.13 *BTU/lb-°F*

Thermal Conductivity

7.8 *W/m-K* 4.5 *BTU/h-ft-°F*

Thermal Expansion

9.8 *µm/m-K*

## Electrical Properties

Electrical Conductivity: Equal Volume

1.2 *% IACS*

Electrical Conductivity: Equal Weight (Specific)

2.5 *% IACS*

## Otherwise Unclassified Properties

Base Metal Price

36 *% relative*

Density

4.5 *g/cm ^{3}* 280

*lb/ft*

^{3}Embodied Carbon

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

Embodied Energy

480 *MJ/kg* 210 *x 10 ^{3} BTU/lb*

Embodied Water

190 *L/kg* 22 *gal/lb*

## Common Calculations

Resilience: Ultimate (Unit Rupture Work)

78 *MJ/m ^{3}*

Resilience: Unit (Modulus of Resilience)

3300 *kJ/m ^{3}*

Stiffness to Weight: Axial

13 *points*

Stiffness to Weight: Bending

35 *points*

Strength to Weight: Axial

55 *points*

Strength to Weight: Bending

46 *points*

Thermal Diffusivity

3.2 *mm ^{2}/s*

Thermal Shock Resistance

63 *points*

## Alloy Composition

Ti | 89.7 to 94 | |

Al | 4.0 to 6.0 | |

Sn | 2.0 to 3.0 | |

Fe | 0 to 0.5 | |

O | 0 to 0.2 | |

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