Dissemination of IT for the Promotion of Materials Science (DoITPoMS)

DoITPoMS Micrograph Library Micrograph 523 and full record

Micrograph 523 and full record

Link to image file for micrograph 523
Micrograph no
523
Brief description
Phosphor bronze exhibiting cored dendrites.
Keywords
alloy Link to MATTER Glossary entry for alloy, bronze Link to MATTER Glossary entry for bronze, copper, coring Link to MATTER Glossary entry for coring, dendrite Link to MATTER Glossary entry for dendrite, metal, tin
Categories
Metal or alloy
System
Cu-Sn   Link to phase diagram
Composition
Cu 90, Sn 10 (wt%) + P trace
Standard codes
Reaction
Processing
Chill cast
Applications
Sample preparation
Ferric chloride
Technique
Reflected light microscopy
Length bar
400 μm
Further information
The microstructures consists of cored dendrites of a phase (brown). The coring causes the concentration of tin in the liquid to increase. Thus instead of solidifying to pure a, the liquid transforms to a and b. The b transforms to a and g and subsequently the g transforms to a and d giving the blueish region. Alloys such as this sometimes exhibit "tin sweat", which is a traditional name given to segregation in Cu-Sn alloys.
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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