# Annealed ASTM B596 Gold-Copper Alloy

Annealed ASTM B596 is ASTM B596 Au-Cu in the annealed condition. The graph bars on the material properties cards below compare annealed ASTM B596 to: precious metal electrical contact alloys (top), all alloys in the same category (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

17 *%*

Knoop Hardness

150

Poisson's Ratio

0.41

Shear Modulus

36 *GPa* 5.2 *x 10 ^{6} psi*

Shear Strength

280 *MPa* 40 *x 10 ^{3} psi*

Tensile Strength: Ultimate (UTS)

450 *MPa* 65 *x 10 ^{3} psi*

## Thermal Properties

Latent Heat of Fusion

77 *J/g*

Melting Completion (Liquidus)

1060 *°C* 1950 *°F*

Melting Onset (Solidus)

930 *°C* 1710 *°F*

Specific Heat Capacity

150 *J/kg-K* 0.037 *BTU/lb-°F*

Thermal Expansion

14 *µm/m-K*

## Other Material Properties

Density

18 *g/cm ^{3}* 1140

*lb/ft*

^{3}Electrical Conductivity: Equal Volume

14 *% IACS*

Electrical Conductivity: Equal Weight (Specific)

6.7 *% IACS*

## Common Calculations

Stiffness to Weight: Axial

3.1 *points*

Stiffness to Weight: Bending

8.5 *points*

Strength to Weight: Axial

6.8 *points*

Strength to Weight: Bending

7.1 *points*

Thermal Shock Resistance

22 *points*

## Alloy Composition

Au | 89 to 91 | |

Cu | 9.0 to 11 | |

res. | 0 to 0.4 |

All values are % weight. Ranges represent what is permitted under applicable standards.

## Followup Questions

## Further Reading

ASTM B596: Standard Specification for Gold-Copper Alloy Electrical Contact Material