# Annealed ASTM B541 Gold Alloy

Annealed ASTM B541 is ASTM B541 gold in the annealed condition. It has the lowest strength and highest ductility compared to the other variants of ASTM B541 gold. The graph bars on the material properties cards below compare annealed ASTM B541 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

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

Elongation at Break

14 *%*

Fatigue Strength

250 *MPa* 36 *x 10 ^{3} psi*

Knoop Hardness

220

Poisson's Ratio

0.4

Shear Modulus

38 *GPa* 5.5 *x 10 ^{6} psi*

Shear Strength

410 *MPa* 59 *x 10 ^{3} psi*

Tensile Strength: Ultimate (UTS)

670 *MPa* 97 *x 10 ^{3} psi*

Tensile Strength: Yield (Proof)

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

## Thermal Properties

Latent Heat of Fusion

90 *J/g*

Melting Completion (Liquidus)

1110 *°C* 2020 *°F*

Melting Onset (Solidus)

930 *°C* 1700 *°F*

Specific Heat Capacity

170 *J/kg-K* 0.041 *BTU/lb-°F*

Thermal Expansion

13 *µm/m-K*

## Other Material Properties

Density

17 *g/cm ^{3}* 1090

*lb/ft*

^{3}Electrical Conductivity: Equal Volume

7.7 *% IACS*

Electrical Conductivity: Equal Weight (Specific)

4.0 *% IACS*

## Common Calculations

Resilience: Ultimate (Unit Rupture Work)

83 *MJ/m ^{3}*

Resilience: Unit (Modulus of Resilience)

1090 *kJ/m ^{3}*

Stiffness to Weight: Axial

3.4 *points*

Stiffness to Weight: Bending

9.0 *points*

Strength to Weight: Axial

11 *points*

Strength to Weight: Bending

9.8 *points*

Thermal Shock Resistance

36 *points*

## Alloy Composition

Au | 70.5 to 72.5 | |

Cu | 13.5 to 15.5 | |

Pt | 8.0 to 9.0 | |

Ag | 4.0 to 5.0 | |

Zn | 0.7 to 1.3 | |

res. | 0 to 0.4 |

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

## Followup Questions

## Further Reading

ASTM B541: Standard Specification for Gold Electrical Contact Alloy