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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.

Copper (Cu) 77.5 to 82.5
Aluminum (Al) 9.0 to 10
Nickel (Ni) 4.5 to 5.8
Iron (Fe) 4.0 to 5.0
Manganese (Mn) 0 to 1.5
Zinc (Zn) 0 to 0.2
Silicon (Si) 0 to 0.1
Tin (Sn) 0 to 0.020
Lead (Pb) 0 to 0.020
Residuals 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