UNS C95820 Nickel-Aluminum Bronze
C95820 bronze is a bronze formulated for casting. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. It has a fairly high heat capacity among cast bronzes. In addition, it has a very high tensile strength and a fairly high melting temperature.
The graph bars on the material properties cards below compare C95820 bronze to: cast 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
15 %
Poisson's Ratio
0.34
Shear Modulus
44 GPa 6.4 x 106 psi
Tensile Strength: Ultimate (UTS)
730 MPa 110 x 103 psi
Tensile Strength: Yield (Proof)
310 MPa 45 x 103 psi
Thermal Properties
Latent Heat of Fusion
230 J/g
Maximum Temperature: Mechanical
230 °C 450 °F
Melting Completion (Liquidus)
1080 °C 1970 °F
Melting Onset (Solidus)
1020 °C 1870 °F
Specific Heat Capacity
440 J/kg-K 0.11 BTU/lb-°F
Thermal Conductivity
38 W/m-K 22 BTU/h-ft-°F
Thermal Expansion
17 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
7.5 % IACS
Electrical Conductivity: Equal Weight (Specific)
8.2 % IACS
Otherwise Unclassified Properties
Base Metal Price
29 % relative
Density
8.3 g/cm3 520 lb/ft3
Embodied Carbon
3.5 kg CO2/kg material
Embodied Energy
56 MJ/kg 24 x 103 BTU/lb
Embodied Water
380 L/kg 45 gal/lb
Common Calculations
Resilience: Ultimate (Unit Rupture Work)
86 MJ/m3
Resilience: Unit (Modulus of Resilience)
400 kJ/m3
Stiffness to Weight: Axial
8.0 points
Stiffness to Weight: Bending
20 points
Strength to Weight: Axial
24 points
Strength to Weight: Bending
22 points
Thermal Diffusivity
11 mm2/s
Thermal Shock Resistance
25 points
Alloy Composition
Among cast copper alloys, the composition of C95820 bronze is notable for containing comparatively high amounts of iron (Fe) and aluminum (Al). Iron is used to increase strength inexpensively. Aluminum is used to add strength and oxidation resistance, at the cost of requiring additional care during casting.
| Cu | 77.5 to 82.5 | |
| Al | 9.0 to 10 | |
| Ni | 4.5 to 5.8 | |
| Fe | 4.0 to 5.0 | |
| Mn | 0 to 1.5 | |
| Zn | 0 to 0.2 | |
| Si | 0 to 0.1 | |
| Sn | 0 to 0.020 | |
| Pb | 0 to 0.020 | |
| res. | 0 to 0.8 |
All values are % weight. Ranges represent what is permitted under applicable standards.
Followup Questions
Similar Alloys
Further Reading
ASTM B148: Standard Specification for Aluminum-Bronze Sand Castings
ASM Specialty Handbook: Copper and Copper Alloys, J. R. Davis (editor), 2001
CRC Materials Science and Engineering Handbook, 4th ed., James F. Shackelford et al. (editors), 2015