Annealed ASTM B685 Palladium-Copper Alloy
Annealed ASTM B685 alloy is ASTM B685 alloy in the annealed condition. The graph bars on the material properties cards below compare annealed 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
Elongation at Break
23 %
Knoop Hardness
160
Poisson's Ratio
0.37
Shear Modulus
43 GPa 6.3 x 106 psi
Shear Strength
410 MPa 60 x 103 psi
Tensile Strength: Ultimate (UTS)
660 MPa 95 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
17 points
Strength to Weight: Bending
16 points
Thermal Shock Resistance
28 points
Alloy Composition
| Pd | 59 to 60.5 | |
| Cu | 39.5 to 40.5 | |
| Ag | 0 to 0.1 | |
| Zn | 0 to 0.060 | |
| Fe | 0 to 0.050 | |
| Cd | 0 to 0.050 | |
| Pb | 0 to 0.030 | |
| Al | 0 to 0.0050 | |
| res. | 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