Age Hardened from Annealed (HT-A) ASTM B541 Gold Alloy
Age hardened and annealed ASTM B541 is ASTM B541 gold in the annealed and aged condition. The graph bars on the material properties cards below compare age hardened and annealed ASTM B541 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
110 GPa 15 x 106 psi
Elongation at Break
8.5 %
Knoop Hardness
310
Poisson's Ratio
0.4
Shear Modulus
38 GPa 5.5 x 106 psi
Shear Strength
590 MPa 86 x 103 psi
Tensile Strength: Ultimate (UTS)
1000 MPa 150 x 103 psi
Tensile Strength: Yield (Proof)
790 MPa 110 x 103 psi
Thermal Properties
Latent Heat of Fusion
90 J/g
Melting Completion (Liquidus)
1110 °C 2020 °F
Melting Onset (Solidus)
930 °C 1700 °F
Specific Heat Capacity
170 J/kg-K 0.041 BTU/lb-°F
Thermal Expansion
13 µm/m-K
Other Material Properties
Density
17 g/cm3 1090 lb/ft3
Electrical Conductivity: Equal Volume
12 % IACS
Electrical Conductivity: Equal Weight (Specific)
6.2 % IACS
Common Calculations
Resilience: Ultimate (Unit Rupture Work)
79 MJ/m3
Resilience: Unit (Modulus of Resilience)
2950 kJ/m3
Stiffness to Weight: Axial
3.4 points
Stiffness to Weight: Bending
9.0 points
Strength to Weight: Axial
16 points
Strength to Weight: Bending
13 points
Thermal Shock Resistance
54 points
Alloy Composition
| Au | 70.5 to 72.5 | |
| Cu | 13.5 to 15.5 | |
| Pt | 8.0 to 9.0 | |
| Ag | 4.0 to 5.0 | |
| Zn | 0.7 to 1.3 | |
| res. | 0 to 0.4 |
All values are % weight. Ranges represent what is permitted under applicable standards.
Followup Questions
Further Reading
ASTM B541: Standard Specification for Gold Electrical Contact Alloy