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
190
Poisson's Ratio
0.41
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
Density
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
| Au | 74.2 to 75.8 | |
| Ag | 21.4 to 22.6 | |
| Ni | 2.6 to 3.4 | |
| res. | 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