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UNS C61900 Aluminum Bronze

C61900 bronze is a bronze formulated for primary forming into wrought products. It has a moderately high heat capacity and a moderately high melting temperature among wrought bronzes.

The properties of C61900 bronze include three common variations. This page shows summary ranges across all of them. For more specific values, follow the links immediately below. The graph bars on the material properties cards further below compare C61900 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

110 GPa 16 x 106 psi

Elongation at Break

21 to 32 %

Poisson's Ratio

0.34

Shear Modulus

43 GPa 6.2 x 106 psi

Shear Strength

370 to 410 MPa 54 to 59 x 103 psi

Tensile Strength: Ultimate (UTS)

570 to 650 MPa 82 to 94 x 103 psi

Tensile Strength: Yield (Proof)

230 to 310 MPa 33 to 45 x 103 psi

Thermal Properties

Latent Heat of Fusion

230 J/g

Maximum Temperature: Mechanical

220 °C 430 °F

Melting Completion (Liquidus)

1050 °C 1920 °F

Melting Onset (Solidus)

1040 °C 1910 °F

Specific Heat Capacity

440 J/kg-K 0.1 BTU/lb-°F

Thermal Conductivity

79 W/m-K 46 BTU/h-ft-°F

Thermal Expansion

18 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

11 % IACS

Electrical Conductivity: Equal Weight (Specific)

11 % IACS

Otherwise Unclassified Properties

Base Metal Price

28 % relative

Density

8.3 g/cm3 520 lb/ft3

Embodied Carbon

3.1 kg CO2/kg material

Embodied Energy

51 MJ/kg 22 x 103 BTU/lb

Embodied Water

380 L/kg 46 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

110 to 150 MJ/m3

Resilience: Unit (Modulus of Resilience)

230 to 430 kJ/m3

Stiffness to Weight: Axial

7.6 points

Stiffness to Weight: Bending

19 points

Strength to Weight: Axial

19 to 22 points

Strength to Weight: Bending

18 to 20 points

Thermal Diffusivity

22 mm2/s

Thermal Shock Resistance

20 to 23 points

Alloy Composition

Among wrought copper alloys, the composition of C61900 bronze is notable for including aluminum (Al) and containing a comparatively high amount of iron (Fe). Aluminum is used to add strength and oxidation resistance. Iron is used to increase strength inexpensively.

Copper (Cu) 83.6 to 88.5
Aluminum (Al) 8.5 to 10
Iron (Fe) 3.0 to 4.5
Zinc (Zn) 0 to 0.8
Tin (Sn) 0 to 0.6
Lead (Pb) 0 to 0.020
Residuals 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

ASTM B124: Standard Specification for Copper and Copper Alloy Forging Rod, Bar, and Shapes

ASTM B283: Standard Specification for Copper and Copper-Alloy Die Forgings (Hot-Pressed)

ASM Specialty Handbook: Copper and Copper Alloys, J. R. Davis (editor), 2001