UNS C63020 Aluminum-Nickel Bronze
C63020 bronze is a bronze formulated for primary forming into wrought products. Cited properties are appropriate for the TQ30 (quench hardened and tempered) condition. C63020 is the UNS number for this material. Additionally, the EN chemical designation is CuAl11Ni5Fe5.
It has a fairly high tensile strength among wrought bronzes. In addition, it has a fairly high heat capacity and a fairly high embodied energy.
The graph bars on the material properties cards below compare C63020 bronze to: wrought bronzes (top), all copper alloys (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
6.8 %
Poisson's Ratio
0.33
Shear Modulus
44 GPa 6.4 x 106 psi
Shear Strength
600 MPa 86 x 103 psi
Tensile Strength: Ultimate (UTS)
1020 MPa 150 x 103 psi
Tensile Strength: Yield (Proof)
740 MPa 110 x 103 psi
Thermal Properties
Latent Heat of Fusion
230 J/g
Maximum Temperature: Mechanical
230 °C 450 °F
Melting Completion (Liquidus)
1070 °C 1970 °F
Melting Onset (Solidus)
1020 °C 1870 °F
Specific Heat Capacity
450 J/kg-K 0.11 BTU/lb-°F
Thermal Conductivity
40 W/m-K 23 BTU/h-ft-°F
Thermal Expansion
18 µm/m-K
Otherwise Unclassified Properties
Base Metal Price
29 % relative
Density
8.2 g/cm3 510 lb/ft3
Embodied Carbon
3.6 kg CO2/kg material
Embodied Energy
58 MJ/kg 25 x 103 BTU/lb
Embodied Water
390 L/kg 46 gal/lb
Common Calculations
Resilience: Ultimate (Unit Rupture Work)
63 MJ/m3
Resilience: Unit (Modulus of Resilience)
2320 kJ/m3
Stiffness to Weight: Axial
8.0 points
Stiffness to Weight: Bending
20 points
Strength to Weight: Axial
34 points
Strength to Weight: Bending
27 points
Thermal Diffusivity
11 mm2/s
Thermal Shock Resistance
35 points
Alloy Composition
Among wrought copper alloys, the composition of C63020 bronze is notable for including chromium (Cr) and cobalt (Co). Chromium additions permits certain types of heat treatment to improve mechanical strength. Cobalt is used to improve strength.
| Cu | 74.7 to 81.8 | |
| Al | 10 to 11 | |
| Ni | 4.2 to 6.0 | |
| Fe | 4.0 to 5.5 | |
| Mn | 0 to 1.5 | |
| Zn | 0 to 0.3 | |
| Sn | 0 to 0.25 | |
| Co | 0 to 0.2 | |
| Cr | 0 to 0.050 | |
| Pb | 0 to 0.030 | |
| res. | 0 to 0.5 |
All values are % weight. Ranges represent what is permitted under applicable standards.
Followup Questions
Similar Alloys
Further Reading
ASTM B150: Standard Specification for Aluminum Bronze Rod, Bar, and Shapes
ASM Specialty Handbook: Copper and Copper Alloys, J. R. Davis (editor), 2001