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Full Record for Micrograph 667
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- Micrograph no
- 667
- 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
- 100 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-Non-Commercial-Share Alike 2.0 UK: England & Wales- Related micrographs