aluminum bronze overview

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Aluminum Bronzes

Overview

Aluminum bronzes are used for their combination of high strength, excellent corrosion awear resistance. Aluminum bronze alloys typically contain 9-12% aluminum and up to 6iron and nickel. Alloys in these composition limits are hardened by a combination of solid

solution strengthening, cold work, and precipitation of an iron rich phase. High aluminumalloys are quenched and tempered. Aluminum bronzes are used in marine hardware,shafts and pump and valve components for handling seawater, sour mine waters,nonoxidizing acids, and industrial process fluids. They are also used in applications such

as heavy duty sleeve bearings, and machine tool ways. They are designated by UNSC60800 through C64210. Aluminum bronze castings have exceptional corrosionresistance, high strength, toughness and wear resistance and good casting and weldingcharacteristics. Aluminum bronze castings are designated as UNS C95200 to C95900.

The microstructure of the aluminum bronzes with less than 11% aluminum consist ofalpha solid solution and the iron and nickel rich kappa phase. The kappa phase absorbs

aluminum from the alpha solid solution preventing the formation of the beta phase unlesthe aluminum content is above 11%. The kappa phase increases the mechanical strengt

of the aluminum bronzes, with no decrease in ductility. The decrease in ductility of thealuminum bronzes occurs when the beta phase forms. The beta phase is harder andmore brittle than the alpha phase. Beta is formed if the material is quenched or fast

cooled, which then transforms into a hard, acicular martensite structure. Tempering themartensite results in a structure of alpha with kappa precipitates. The tempered structure

is very desirable, it has high strength and hardness. The slow cooled, as cast structuresconsist of alpha and kappa phases. Kappa is present in the lamellar form and finelydivided in all the alpha areas. The addition of iron and nickel also suppress the formation

of the gamma double prime phase which has deleterious effects on the properties ofaluminum copper alloys.

NOTE: The file size of the Largerand Largest View of the Micrographs are substantially larger than thethumbnail shown. The Larger View images range in size from 11K to 120K depending on the image. TheLargest View images range in size from 125K to almost 500K.

Nominal Composition:Cu 90.83, Al 6.5, Fe 2.4, Sn

Alloy Family: Aluminum bronzes

Product Form: Plate

Processing: Hot rolled

Etchant:

Scale Line Length: ~ 125Microns

Alloy: C61300

Tem er:

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Larger View of Micrograph(images/D2_001m.JPG)Largest View of Micrograph(images/D2_001h.JPG)

Material: Aluminum bronze, 6-7.5 Al

Source: University of Florida

Nominal Composition:Cu 90.83, Al 6.5, Fe 2.4, Sn0.27



Product Form: Rod

Processing: Extruded and cold drawn

Etchant:


Alloy: C61300

Temper:



Nominal Composition:Cu 87.1, Al 9.3, Fe 3.6

Larger View of Micrograph(images/D2_008m.JPG)Largest View of Micrograph

(images/D2_008h.JPG)


Product Form: Rod

Processing: Extruded and cold drawn 10%

Etchant:


Alloy: C62400

Temper:




Product Form: Rod




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Processing: Extruded

Etchant:


Alloy: C62500

Temper:

Material: Aluminum bronze, 12.5-13.5 Al


Nominal Composition:Cu 82.5, Al 9.7, Ni 4.9, Fe 2.9



Product Form:

Processing: As quenched from 857C

Etchant:

Scale LineLength:

~ 25Microns

Alloy: C63000

Temper:

Material: Nickel-aluminum bronze, 9.0-11.0 Al, 4.0-5.5Ni


Nominal Composition:Cu 82.5, Al 9.7, Ni 4.9, Fe 2.9



Product Form: Rod

Processing: Extruded and cold drawn

Etchant:

Scale Line

Length:

~ 125Microns

Alloy: C63000

Temper:

Material: Nickel-aluminum bronze, 9.0-11.0 Al, 4.0-5.5Ni





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Nominal Composition:Cu 80.4, Al 8.9, Ni 5.0, Fe 4.7,Mn 1.0



Product Form:

Processing: Extruded

Etchant:

Scale LineLength:

~ 125Microns

Alloy: C63200

Temper:

Material: Nickel-aluminum bronze, 8.7-9.5 Al , 4.0-4.8Ni


Nominal Composition:Cu 80.4, Al 8.9, Ni 5.0, Fe 4.7,Mn 1.0



Product Form:

Processing: Quenched from 927C and tempered at 705

Etchant:

Scale LineLength:

~ 500Microns

Alloy: C63200

Temper:

Material: Nickel-aluminum bronze, 8.7-9.5 Al , 4.0-4.8Ni



Product Form: Cast

Processing: Cast, annealed at 621C and water quenche

Etchant:





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Alloy: C95400

Temper:



Nominal Composition:

Cu 85.8, Al 10.2, Fe 4.0



Product Form: Cast

Processing: Annealed and furnace cooled

Etchant:


Alloy: C95400

Temper:






Product Form: Cast

Processing: Annealed at 621C and water quenched

Etchant:


Alloy: C95400

Temper:




Product Form: Cast

Processing: Cast and quenched from 913C

Etchant:


Alloy: C95400




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Temper:



Nominal Composition:Cu 78 min, Al 10.0-11.5, Ni

3.0-5.5, Fe 3.0-5.0, Mn 3.5



Product Form: Cast

Processing: Cast and heat treated

Etchant:

Scale LineLength:

~ 250Microns

Alloy: C95500

Temper:

Material: Nickel-aluminum bronze, 10-11.5 Al, 3-5.5 NiMn 3.5


Nominal Composition:Cu 81.4, Al 8.9.5, Ni 4.7, Fe4.0, Mn 1.0



Product Form: Cast

Processing: Annealed at 621C and air cooled

Etchant:


Alloy: C95800

Temper:

Material: Nickel-aluminum bronze, 9 Al, 4.5 Ni



Product Form: Cast


Etchant:





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Nominal Composition:Cu 81.4, Al 8.9.5, Ni 4.7, Fe4.0, Mn 1.0


Alloy: C95800

Temper:



Nominal Composition:

Cu 81.4, Al 8.9.5, Ni 4.7, Fe4.0, Mn 1.0



Product Form: Cast


Etchant:


Alloy: C95800

Temper:




aluminum bronze overview

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