# Quarter-Hard 60-Palladium 40-Silver Alloy

Quarter-hard 60Pd-40Ag alloy is 60Pd-40Ag alloy in the quarter-hard temper. The graph bars on the material properties cards below compare quarter-hard 60Pd-40Ag alloy 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

1.1 *%*

Knoop Hardness

150

Poisson's Ratio

0.38

Shear Modulus

37 *GPa* 5.3 *x 10 ^{6} psi*

Shear Strength

290 *MPa* 43 *x 10 ^{3} psi*

Tensile Strength: Ultimate (UTS)

520 *MPa* 75 *x 10 ^{3} psi*

## Thermal Properties

Latent Heat of Fusion

140 *J/g*

Melting Completion (Liquidus)

1360 *°C* 2480 *°F*

Melting Onset (Solidus)

1310 *°C* 2390 *°F*

Specific Heat Capacity

240 *J/kg-K* 0.057 *BTU/lb-°F*

Thermal Conductivity

29 *W/m-K* 17 *BTU/h-ft-°F*

Thermal Expansion

15 *µm/m-K*

## Other Material Properties

Density

11 *g/cm ^{3}* 710

*lb/ft*

^{3}Electrical Conductivity: Equal Volume

4.1 *% IACS*

Electrical Conductivity: Equal Weight (Specific)

3.2 *% IACS*

## Common Calculations

Stiffness to Weight: Axial

4.9 *points*

Stiffness to Weight: Bending

14 *points*

Strength to Weight: Axial

13 *points*

Strength to Weight: Bending

13 *points*

Thermal Diffusivity

11 *mm ^{2}/s*

Thermal Shock Resistance

25 *points*

## Alloy Composition

Pd | 59.5 to 60.9 | |

Ag | 39.1 to 40.5 | |

Cu | 0 to 0.1 | |

res. | 0 to 0.3 |

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

## Followup Questions

## Further Reading

ASTM B731: Standard Specification for 60% Palladium-40% Silver Electrical Contact Material