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1/8-Hard ASTM B628 Silver-Copper Eutectic Alloy

1/8-hard ASTM B628 is ASTM B628 Ag-Cu in the 1/8-hard temper. It has the second lowest strength and second highest ductility compared to the other variants of ASTM B628 Ag-Cu.

The graph bars on the material properties cards below compare 1/8-hard ASTM B628 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

83 GPa 12 x 106 psi

Elongation at Break

7.8 %

Poisson's Ratio

0.36

Shear Modulus

31 GPa 4.4 x 106 psi

Shear Strength

230 MPa 34 x 103 psi

Tensile Strength: Ultimate (UTS)

400 MPa 57 x 103 psi

Thermal Properties

Latent Heat of Fusion

140 J/g

Melting Completion (Liquidus)

780 °C 1430 °F

Melting Onset (Solidus)

780 °C 1430 °F

Specific Heat Capacity

280 J/kg-K 0.066 BTU/lb-°F

Thermal Expansion

19 µm/m-K

Other Material Properties

Density

10 g/cm3 630 lb/ft3

Electrical Conductivity: Equal Volume

84 % IACS

Electrical Conductivity: Equal Weight (Specific)

75 % IACS

Common Calculations

Stiffness to Weight: Axial

4.6 points

Stiffness to Weight: Bending

14 points

Strength to Weight: Axial

11 points

Strength to Weight: Bending

12 points

Thermal Shock Resistance

18 points

Alloy Composition

Silver (Ag)Ag 71 to 73
Copper (Cu)Cu 26.6 to 29
Zinc (Zn)Zn 0 to 0.060
Iron (Fe)Fe 0 to 0.050
Cadmium (Cd)Cd 0 to 0.050
Phosphorus (P)P 0 to 0.030
Lead (Pb)Pb 0 to 0.030
Nickel (Ni)Ni 0 to 0.010
Aluminum (Al)Al 0 to 0.0050
Residualsres. 0 to 0.21

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

Followup Questions

Further Reading

ASTM B628: Standard Specification for Silver-Copper Eutectic Electrical Contact Alloy

CRC Materials Science and Engineering Handbook, 4th ed., James F. Shackelford et al. (editors), 2015