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Work Hardened ASTM B685 Palladium-Copper Alloy

Work hardened ASTM B685 alloy is ASTM B685 alloy in the cold worked (strain hardened) condition. The graph bars on the material properties cards below compare work hardened ASTM B685 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

120 GPa 17 x 106 psi

Poisson's Ratio

0.37

Shear Modulus

43 GPa 6.3 x 106 psi

Tensile Strength: Ultimate (UTS)

1060 MPa 150 x 103 psi

Thermal Properties

Latent Heat of Fusion

180 J/g

Melting Completion (Liquidus)

1230 °C 2240 °F

Melting Onset (Solidus)

1200 °C 2180 °F

Specific Heat Capacity

300 J/kg-K 0.071 BTU/lb-°F

Thermal Expansion

14 µm/m-K

Other Material Properties

Density

11 g/cm3 670 lb/ft3

Electrical Conductivity: Equal Volume

5.0 % IACS

Electrical Conductivity: Equal Weight (Specific)

4.1 % IACS

Common Calculations

Stiffness to Weight: Axial

6.1 points

Stiffness to Weight: Bending

15 points

Strength to Weight: Axial

27 points

Strength to Weight: Bending

21 points

Thermal Shock Resistance

46 points

Alloy Composition

Palladium (Pd)Pd 59 to 60.5
Copper (Cu)Cu 39.5 to 40.5
Silver (Ag)Ag 0 to 0.1
Zinc (Zn)Zn 0 to 0.060
Iron (Fe)Fe 0 to 0.050
Cadmium (Cd)Cd 0 to 0.050
Lead (Pb)Pb 0 to 0.030
Aluminum (Al)Al 0 to 0.0050
Residualsres. 0 to 0.2

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

Followup Questions

Further Reading

ASTM B685: Standard Specification for Palladium-Copper Electrical Contact Material