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Full Record for Micrograph 444

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Micrograph no
444
Brief description
Commercial grade free machining brass - Widmanstätten microstructure
Keywords
alloy Link to MATTER Glossary entry for alloy, brass Link to MATTER Glossary entry for brass, copper, metal, Widmanstätten Link to MATTER Glossary entry for Widmanstätten, zinc
Categories
Metal or alloy
System
Cu-Zn   Link to phase diagram
Composition
Cu 60, Zn 40 (wt%) + Pb trace
Standard codes
Reaction
Processing
Chill cast
Applications
Sample preparation
Ammonium persulphate
Technique
Reflected light microscopy
Length bar
200 μm
Further information
This sample has been air cooled. The fast cooling rate changes the morphology to a 'basket weave' appearance known as a Widmanstätten microstructure. The a phase precipitates out of the single b phase during cooling to give a plates in a b matrix. The plates form in order to minimise strain energy.
Contributor
Dr R F Cochrane
Organisation
Department of Materials, University of Leeds
Date
04/09/02
Licence for re-use
Attribution-Non-Commercial-Share Alike 2.0 UK: England & Wales
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