Micrograph 666 and full record

Micrograph no

666

Brief description

Al-90 wt% Cu (bronze)

Keywords

alloy , aluminium , bronze , copper, corrosion resistance, lamella , martensite , metal, Widmanstätten 

Categories

Metal or alloy

System

Al-Cu  

Composition

Al 10, Cu 90 (wt%)

Standard codes

Reaction

Processing

Applications

Bearings, gears, corrosion resistant vessels

Sample preparation

Etched in ferric chloride

Technique

Reflected light microscopy

Length bar

200 μm

Further information

This is a copper-aluminium bronze containing 10 wt% aluminium. A small amount of iron is often added to act as a grain refiner to improve the mechanical properties. Alloys with more than 8 wt% aluminium solidify as the b phase. Below about 930ºC, Widmanstätten a phase precipitates. At the eutectoid temperature (565ºC) the remaining b decomposes to a lamellar eutectoid of a and b. Rapid cooling from the high temperature b phase can form martensite instead of Widmanstätten a. Aluminium bronzes have high strength, corrosion resistance and good high temperature properties (up to 300-400ºC). Typical applications include bearings, gears and corrosion resistant vessels.

Contributor

Dr J Marrow

Organisation

Department of Materials Science, University of Manchester and UMIST

Date

07/11/02

Licence for re-use

Attribution-NonCommercial-ShareAlike 4.0 International

Related micrographs

• Micrograph 665: Al-90 wt% Cu (bronze) (400 μm)
• Micrograph 667: Al-90 wt% Cu (bronze) (100 μm)
• Micrograph 668: Al-90 wt% Cu (bronze) (50 μm)
• Micrograph 669: Al-90 wt% Cu (bronze) (20 μm)

View image alone .. in a new window

View micrograph only

View full record only

Help is available on downloading images