Menu (ESC)

Temper C ASTM B477 Gold-Nickel-Silver Alloy

Temper C ASTM B477 is a type of ASTM B477 Au-Ni-Ag. It has the highest strength and lowest ductility compared to the other variants of ASTM B477 Au-Ni-Ag. The graph bars on the material properties cards below compare temper C ASTM B477 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

95 GPa 14 x 106 psi

Elongation at Break

5.5 %

Knoop Hardness


Poisson's Ratio


Shear Modulus

34 GPa 4.9 x 106 psi

Shear Strength

320 MPa 46 x 103 psi

Tensile Strength: Ultimate (UTS)

550 MPa 80 x 103 psi

Thermal Properties

Latent Heat of Fusion

80 J/g

Melting Completion (Liquidus)

1010 °C 1850 °F

Melting Onset (Solidus)

930 °C 1700 °F

Specific Heat Capacity

160 J/kg-K 0.039 BTU/lb-°F

Thermal Expansion

15 µm/m-K

Other Material Properties


17 g/cm3 1060 lb/ft3

Electrical Conductivity: Equal Volume

14 % IACS

Electrical Conductivity: Equal Weight (Specific)

7.5 % IACS

Common Calculations

Stiffness to Weight: Axial

3.1 points

Stiffness to Weight: Bending

8.9 points

Strength to Weight: Axial

9.0 points

Strength to Weight: Bending

8.8 points

Thermal Shock Resistance

28 points

Alloy Composition

Gold (Au)Au 74.2 to 75.8
Silver (Ag)Ag 21.4 to 22.6
Nickel (Ni)Ni 2.6 to 3.4
Residualsres. 0 to 0.3

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

Followup Questions

Further Reading

ASTM B477: Standard Specification for Gold-Silver-Nickel Electrical Contact Alloy

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